Chris@47: // Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
Chris@47: // Licensed under the MIT License:
Chris@47: //
Chris@47: // Permission is hereby granted, free of charge, to any person obtaining a copy
Chris@47: // of this software and associated documentation files (the "Software"), to deal
Chris@47: // in the Software without restriction, including without limitation the rights
Chris@47: // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
Chris@47: // copies of the Software, and to permit persons to whom the Software is
Chris@47: // furnished to do so, subject to the following conditions:
Chris@47: //
Chris@47: // The above copyright notice and this permission notice shall be included in
Chris@47: // all copies or substantial portions of the Software.
Chris@47: //
Chris@47: // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Chris@47: // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Chris@47: // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
Chris@47: // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Chris@47: // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
Chris@47: // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
Chris@47: // THE SOFTWARE.
Chris@47: 
Chris@47: // This file defines classes that can be used to manipulate messages based on schemas that are not
Chris@47: // known until runtime.  This is also useful for writing generic code that uses schemas to handle
Chris@47: // arbitrary types in a generic way.
Chris@47: //
Chris@47: // Each of the classes defined here has a to() template method which converts an instance back to a
Chris@47: // native type.  This method will throw an exception if the requested type does not match the
Chris@47: // schema.  To convert native types to dynamic, use DynamicFactory.
Chris@47: //
Chris@47: // As always, underlying data is validated lazily, so you have to actually traverse the whole
Chris@47: // message if you want to validate all content.
Chris@47: 
Chris@47: #ifndef CAPNP_DYNAMIC_H_
Chris@47: #define CAPNP_DYNAMIC_H_
Chris@47: 
Chris@47: #if defined(__GNUC__) && !defined(CAPNP_HEADER_WARNINGS)
Chris@47: #pragma GCC system_header
Chris@47: #endif
Chris@47: 
Chris@47: #include "schema.h"
Chris@47: #include "layout.h"
Chris@47: #include "message.h"
Chris@47: #include "any.h"
Chris@47: #include "capability.h"
Chris@47: 
Chris@47: namespace capnp {
Chris@47: 
Chris@47: class MessageReader;
Chris@47: class MessageBuilder;
Chris@47: 
Chris@47: struct DynamicValue {
Chris@47:   DynamicValue() = delete;
Chris@47: 
Chris@47:   enum Type {
Chris@47:     UNKNOWN,
Chris@47:     // Means that the value has unknown type and content because it comes from a newer version of
Chris@47:     // the schema, or from a newer version of Cap'n Proto that has new features that this version
Chris@47:     // doesn't understand.
Chris@47: 
Chris@47:     VOID,
Chris@47:     BOOL,
Chris@47:     INT,
Chris@47:     UINT,
Chris@47:     FLOAT,
Chris@47:     TEXT,
Chris@47:     DATA,
Chris@47:     LIST,
Chris@47:     ENUM,
Chris@47:     STRUCT,
Chris@47:     CAPABILITY,
Chris@47:     ANY_POINTER
Chris@47:   };
Chris@47: 
Chris@47:   class Reader;
Chris@47:   class Builder;
Chris@47:   class Pipeline;
Chris@47: };
Chris@47: class DynamicEnum;
Chris@47: struct DynamicStruct {
Chris@47:   DynamicStruct() = delete;
Chris@47:   class Reader;
Chris@47:   class Builder;
Chris@47:   class Pipeline;
Chris@47: };
Chris@47: struct DynamicList {
Chris@47:   DynamicList() = delete;
Chris@47:   class Reader;
Chris@47:   class Builder;
Chris@47: };
Chris@47: struct DynamicCapability {
Chris@47:   DynamicCapability() = delete;
Chris@47:   class Client;
Chris@47:   class Server;
Chris@47: };
Chris@47: template <> class Orphan<DynamicValue>;
Chris@47: 
Chris@47: template <Kind k> struct DynamicTypeFor_;
Chris@47: template <> struct DynamicTypeFor_<Kind::ENUM> { typedef DynamicEnum Type; };
Chris@47: template <> struct DynamicTypeFor_<Kind::STRUCT> { typedef DynamicStruct Type; };
Chris@47: template <> struct DynamicTypeFor_<Kind::LIST> { typedef DynamicList Type; };
Chris@47: template <> struct DynamicTypeFor_<Kind::INTERFACE> { typedef DynamicCapability Type; };
Chris@47: 
Chris@47: template <typename T>
Chris@47: using DynamicTypeFor = typename DynamicTypeFor_<kind<T>()>::Type;
Chris@47: 
Chris@47: template <typename T>
Chris@47: ReaderFor<DynamicTypeFor<FromReader<T>>> toDynamic(T&& value);
Chris@47: template <typename T>
Chris@47: BuilderFor<DynamicTypeFor<FromBuilder<T>>> toDynamic(T&& value);
Chris@47: template <typename T>
Chris@47: DynamicTypeFor<TypeIfEnum<T>> toDynamic(T&& value);
Chris@47: template <typename T>
Chris@47: typename DynamicTypeFor<FromServer<T>>::Client toDynamic(kj::Own<T>&& value);
Chris@47: 
Chris@47: namespace _ {  // private
Chris@47: 
Chris@47: template <> struct Kind_<DynamicValue     > { static constexpr Kind kind = Kind::OTHER; };
Chris@47: template <> struct Kind_<DynamicEnum      > { static constexpr Kind kind = Kind::OTHER; };
Chris@47: template <> struct Kind_<DynamicStruct    > { static constexpr Kind kind = Kind::OTHER; };
Chris@47: template <> struct Kind_<DynamicList      > { static constexpr Kind kind = Kind::OTHER; };
Chris@47: template <> struct Kind_<DynamicCapability> { static constexpr Kind kind = Kind::OTHER; };
Chris@47: 
Chris@47: }  // namespace _ (private)
Chris@47: 
Chris@47: template <> inline constexpr Style style<DynamicValue     >() { return Style::POINTER;    }
Chris@47: template <> inline constexpr Style style<DynamicEnum      >() { return Style::PRIMITIVE;  }
Chris@47: template <> inline constexpr Style style<DynamicStruct    >() { return Style::STRUCT;     }
Chris@47: template <> inline constexpr Style style<DynamicList      >() { return Style::POINTER;    }
Chris@47: template <> inline constexpr Style style<DynamicCapability>() { return Style::CAPABILITY; }
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: class DynamicEnum {
Chris@47: public:
Chris@47:   DynamicEnum() = default;
Chris@47:   inline DynamicEnum(EnumSchema::Enumerant enumerant)
Chris@47:       : schema(enumerant.getContainingEnum()), value(enumerant.getOrdinal()) {}
Chris@47:   inline DynamicEnum(EnumSchema schema, uint16_t value)
Chris@47:       : schema(schema), value(value) {}
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<T>() == Kind::ENUM>>
Chris@47:   inline DynamicEnum(T&& value): DynamicEnum(toDynamic(value)) {}
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   inline T as() const { return static_cast<T>(asImpl(typeId<T>())); }
Chris@47:   // Cast to a native enum type.
Chris@47: 
Chris@47:   inline EnumSchema getSchema() const { return schema; }
Chris@47: 
Chris@47:   kj::Maybe<EnumSchema::Enumerant> getEnumerant() const;
Chris@47:   // Get which enumerant this enum value represents.  Returns nullptr if the numeric value does not
Chris@47:   // correspond to any enumerant in the schema -- this can happen if the data was built using a
Chris@47:   // newer schema that has more values defined.
Chris@47: 
Chris@47:   inline uint16_t getRaw() const { return value; }
Chris@47:   // Returns the raw underlying enum value.
Chris@47: 
Chris@47: private:
Chris@47:   EnumSchema schema;
Chris@47:   uint16_t value;
Chris@47: 
Chris@47:   uint16_t asImpl(uint64_t requestedTypeId) const;
Chris@47: 
Chris@47:   friend struct DynamicStruct;
Chris@47:   friend struct DynamicList;
Chris@47:   friend struct DynamicValue;
Chris@47:   template <typename T>
Chris@47:   friend DynamicTypeFor<TypeIfEnum<T>> toDynamic(T&& value);
Chris@47: };
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: class DynamicStruct::Reader {
Chris@47: public:
Chris@47:   typedef DynamicStruct Reads;
Chris@47: 
Chris@47:   Reader() = default;
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<FromReader<T>>() == Kind::STRUCT>>
Chris@47:   inline Reader(T&& value): Reader(toDynamic(value)) {}
Chris@47: 
Chris@47:   inline MessageSize totalSize() const { return reader.totalSize().asPublic(); }
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   typename T::Reader as() const;
Chris@47:   // Convert the dynamic struct to its compiled-in type.
Chris@47: 
Chris@47:   inline StructSchema getSchema() const { return schema; }
Chris@47: 
Chris@47:   DynamicValue::Reader get(StructSchema::Field field) const;
Chris@47:   // Read the given field value.
Chris@47: 
Chris@47:   bool has(StructSchema::Field field) const;
Chris@47:   // Tests whether the given field is set to its default value.  For pointer values, this does
Chris@47:   // not actually traverse the value comparing it with the default, but simply returns true if the
Chris@47:   // pointer is non-null.  For members of unions, has() returns false if the union member is not
Chris@47:   // active, but does not necessarily return true if the member is active (depends on the field's
Chris@47:   // value).
Chris@47: 
Chris@47:   kj::Maybe<StructSchema::Field> which() const;
Chris@47:   // If the struct contains an (unnamed) union, and the currently-active field within that union
Chris@47:   // is known, this returns that field.  Otherwise, it returns null.  In other words, this returns
Chris@47:   // null if there is no union present _or_ if the union's discriminant is set to an unrecognized
Chris@47:   // value.  This could happen in particular when receiving a message from a sender who has a
Chris@47:   // newer version of the protocol and is using a field of the union that you don't know about yet.
Chris@47: 
Chris@47:   DynamicValue::Reader get(kj::StringPtr name) const;
Chris@47:   bool has(kj::StringPtr name) const;
Chris@47:   // Shortcuts to access fields by name.  These throw exceptions if no such field exists.
Chris@47: 
Chris@47: private:
Chris@47:   StructSchema schema;
Chris@47:   _::StructReader reader;
Chris@47: 
Chris@47:   inline Reader(StructSchema schema, _::StructReader reader)
Chris@47:       : schema(schema), reader(reader) {}
Chris@47: 
Chris@47:   bool isSetInUnion(StructSchema::Field field) const;
Chris@47:   void verifySetInUnion(StructSchema::Field field) const;
Chris@47:   static DynamicValue::Reader getImpl(_::StructReader reader, StructSchema::Field field);
Chris@47: 
Chris@47:   template <typename T, Kind K>
Chris@47:   friend struct _::PointerHelpers;
Chris@47:   friend class DynamicStruct::Builder;
Chris@47:   friend struct DynamicList;
Chris@47:   friend class MessageReader;
Chris@47:   friend class MessageBuilder;
Chris@47:   template <typename T, ::capnp::Kind k>
Chris@47:   friend struct ::capnp::ToDynamic_;
Chris@47:   friend kj::StringTree _::structString(
Chris@47:       _::StructReader reader, const _::RawBrandedSchema& schema);
Chris@47:   friend class Orphanage;
Chris@47:   friend class Orphan<DynamicStruct>;
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47:   friend class Orphan<AnyPointer>;
Chris@47: };
Chris@47: 
Chris@47: class DynamicStruct::Builder {
Chris@47: public:
Chris@47:   typedef DynamicStruct Builds;
Chris@47: 
Chris@47:   Builder() = default;
Chris@47:   inline Builder(decltype(nullptr)) {}
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<FromBuilder<T>>() == Kind::STRUCT>>
Chris@47:   inline Builder(T&& value): Builder(toDynamic(value)) {}
Chris@47: 
Chris@47:   inline MessageSize totalSize() const { return asReader().totalSize(); }
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   typename T::Builder as();
Chris@47:   // Cast to a particular struct type.
Chris@47: 
Chris@47:   inline StructSchema getSchema() const { return schema; }
Chris@47: 
Chris@47:   DynamicValue::Builder get(StructSchema::Field field);
Chris@47:   // Read the given field value.
Chris@47: 
Chris@47:   inline bool has(StructSchema::Field field) { return asReader().has(field); }
Chris@47:   // Tests whether the given field is set to its default value.  For pointer values, this does
Chris@47:   // not actually traverse the value comparing it with the default, but simply returns true if the
Chris@47:   // pointer is non-null.  For members of unions, has() returns whether the field is currently
Chris@47:   // active and the union as a whole is non-default -- so, the only time has() will return false
Chris@47:   // for an active union field is if it is the default active field and it has its default value.
Chris@47: 
Chris@47:   kj::Maybe<StructSchema::Field> which();
Chris@47:   // If the struct contains an (unnamed) union, and the currently-active field within that union
Chris@47:   // is known, this returns that field.  Otherwise, it returns null.  In other words, this returns
Chris@47:   // null if there is no union present _or_ if the union's discriminant is set to an unrecognized
Chris@47:   // value.  This could happen in particular when receiving a message from a sender who has a
Chris@47:   // newer version of the protocol and is using a field of the union that you don't know about yet.
Chris@47: 
Chris@47:   void set(StructSchema::Field field, const DynamicValue::Reader& value);
Chris@47:   // Set the given field value.
Chris@47: 
Chris@47:   DynamicValue::Builder init(StructSchema::Field field);
Chris@47:   DynamicValue::Builder init(StructSchema::Field field, uint size);
Chris@47:   // Init a struct, list, or blob field.
Chris@47: 
Chris@47:   void adopt(StructSchema::Field field, Orphan<DynamicValue>&& orphan);
Chris@47:   Orphan<DynamicValue> disown(StructSchema::Field field);
Chris@47:   // Adopt/disown.  This works even for non-pointer fields: adopt() becomes equivalent to set()
Chris@47:   // and disown() becomes like get() followed by clear().
Chris@47: 
Chris@47:   void clear(StructSchema::Field field);
Chris@47:   // Clear a field, setting it to its default value.  For pointer fields, this actually makes the
Chris@47:   // field null.
Chris@47: 
Chris@47:   DynamicValue::Builder get(kj::StringPtr name);
Chris@47:   bool has(kj::StringPtr name);
Chris@47:   void set(kj::StringPtr name, const DynamicValue::Reader& value);
Chris@47:   void set(kj::StringPtr name, std::initializer_list<DynamicValue::Reader> value);
Chris@47:   DynamicValue::Builder init(kj::StringPtr name);
Chris@47:   DynamicValue::Builder init(kj::StringPtr name, uint size);
Chris@47:   void adopt(kj::StringPtr name, Orphan<DynamicValue>&& orphan);
Chris@47:   Orphan<DynamicValue> disown(kj::StringPtr name);
Chris@47:   void clear(kj::StringPtr name);
Chris@47:   // Shortcuts to access fields by name.  These throw exceptions if no such field exists.
Chris@47: 
Chris@47:   Reader asReader() const;
Chris@47: 
Chris@47: private:
Chris@47:   StructSchema schema;
Chris@47:   _::StructBuilder builder;
Chris@47: 
Chris@47:   inline Builder(StructSchema schema, _::StructBuilder builder)
Chris@47:       : schema(schema), builder(builder) {}
Chris@47: 
Chris@47:   bool isSetInUnion(StructSchema::Field field);
Chris@47:   void verifySetInUnion(StructSchema::Field field);
Chris@47:   void setInUnion(StructSchema::Field field);
Chris@47: 
Chris@47:   template <typename T, Kind k>
Chris@47:   friend struct _::PointerHelpers;
Chris@47:   friend struct DynamicList;
Chris@47:   friend class MessageReader;
Chris@47:   friend class MessageBuilder;
Chris@47:   template <typename T, ::capnp::Kind k>
Chris@47:   friend struct ::capnp::ToDynamic_;
Chris@47:   friend class Orphanage;
Chris@47:   friend class Orphan<DynamicStruct>;
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47:   friend class Orphan<AnyPointer>;
Chris@47: };
Chris@47: 
Chris@47: class DynamicStruct::Pipeline {
Chris@47: public:
Chris@47:   typedef DynamicStruct Pipelines;
Chris@47: 
Chris@47:   inline Pipeline(decltype(nullptr)): typeless(nullptr) {}
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   typename T::Pipeline releaseAs();
Chris@47:   // Convert the dynamic pipeline to its compiled-in type.
Chris@47: 
Chris@47:   inline StructSchema getSchema() { return schema; }
Chris@47: 
Chris@47:   DynamicValue::Pipeline get(StructSchema::Field field);
Chris@47:   // Read the given field value.
Chris@47: 
Chris@47:   DynamicValue::Pipeline get(kj::StringPtr name);
Chris@47:   // Get by string name.
Chris@47: 
Chris@47: private:
Chris@47:   StructSchema schema;
Chris@47:   AnyPointer::Pipeline typeless;
Chris@47: 
Chris@47:   inline explicit Pipeline(StructSchema schema, AnyPointer::Pipeline&& typeless)
Chris@47:       : schema(schema), typeless(kj::mv(typeless)) {}
Chris@47: 
Chris@47:   friend class Request<DynamicStruct, DynamicStruct>;
Chris@47: };
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: class DynamicList::Reader {
Chris@47: public:
Chris@47:   typedef DynamicList Reads;
Chris@47: 
Chris@47:   inline Reader(): reader(ElementSize::VOID) {}
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<FromReader<T>>() == Kind::LIST>>
Chris@47:   inline Reader(T&& value): Reader(toDynamic(value)) {}
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   typename T::Reader as() const;
Chris@47:   // Try to convert to any List<T>, Data, or Text.  Throws an exception if the underlying data
Chris@47:   // can't possibly represent the requested type.
Chris@47: 
Chris@47:   inline ListSchema getSchema() const { return schema; }
Chris@47: 
Chris@47:   inline uint size() const { return reader.size() / ELEMENTS; }
Chris@47:   DynamicValue::Reader operator[](uint index) const;
Chris@47: 
Chris@47:   typedef _::IndexingIterator<const Reader, DynamicValue::Reader> Iterator;
Chris@47:   inline Iterator begin() const { return Iterator(this, 0); }
Chris@47:   inline Iterator end() const { return Iterator(this, size()); }
Chris@47: 
Chris@47: private:
Chris@47:   ListSchema schema;
Chris@47:   _::ListReader reader;
Chris@47: 
Chris@47:   Reader(ListSchema schema, _::ListReader reader): schema(schema), reader(reader) {}
Chris@47: 
Chris@47:   template <typename T, Kind k>
Chris@47:   friend struct _::PointerHelpers;
Chris@47:   friend struct DynamicStruct;
Chris@47:   friend class DynamicList::Builder;
Chris@47:   template <typename T, ::capnp::Kind k>
Chris@47:   friend struct ::capnp::ToDynamic_;
Chris@47:   friend class Orphanage;
Chris@47:   friend class Orphan<DynamicList>;
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47:   friend class Orphan<AnyPointer>;
Chris@47: };
Chris@47: 
Chris@47: class DynamicList::Builder {
Chris@47: public:
Chris@47:   typedef DynamicList Builds;
Chris@47: 
Chris@47:   inline Builder(): builder(ElementSize::VOID) {}
Chris@47:   inline Builder(decltype(nullptr)): builder(ElementSize::VOID) {}
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<FromBuilder<T>>() == Kind::LIST>>
Chris@47:   inline Builder(T&& value): Builder(toDynamic(value)) {}
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   typename T::Builder as();
Chris@47:   // Try to convert to any List<T>, Data, or Text.  Throws an exception if the underlying data
Chris@47:   // can't possibly represent the requested type.
Chris@47: 
Chris@47:   inline ListSchema getSchema() const { return schema; }
Chris@47: 
Chris@47:   inline uint size() const { return builder.size() / ELEMENTS; }
Chris@47:   DynamicValue::Builder operator[](uint index);
Chris@47:   void set(uint index, const DynamicValue::Reader& value);
Chris@47:   DynamicValue::Builder init(uint index, uint size);
Chris@47:   void adopt(uint index, Orphan<DynamicValue>&& orphan);
Chris@47:   Orphan<DynamicValue> disown(uint index);
Chris@47: 
Chris@47:   typedef _::IndexingIterator<Builder, DynamicStruct::Builder> Iterator;
Chris@47:   inline Iterator begin() { return Iterator(this, 0); }
Chris@47:   inline Iterator end() { return Iterator(this, size()); }
Chris@47: 
Chris@47:   void copyFrom(std::initializer_list<DynamicValue::Reader> value);
Chris@47: 
Chris@47:   Reader asReader() const;
Chris@47: 
Chris@47: private:
Chris@47:   ListSchema schema;
Chris@47:   _::ListBuilder builder;
Chris@47: 
Chris@47:   Builder(ListSchema schema, _::ListBuilder builder): schema(schema), builder(builder) {}
Chris@47: 
Chris@47:   template <typename T, Kind k>
Chris@47:   friend struct _::PointerHelpers;
Chris@47:   friend struct DynamicStruct;
Chris@47:   template <typename T, ::capnp::Kind k>
Chris@47:   friend struct ::capnp::ToDynamic_;
Chris@47:   friend class Orphanage;
Chris@47:   template <typename T, Kind k>
Chris@47:   friend struct _::OrphanGetImpl;
Chris@47:   friend class Orphan<DynamicList>;
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47:   friend class Orphan<AnyPointer>;
Chris@47: };
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: class DynamicCapability::Client: public Capability::Client {
Chris@47: public:
Chris@47:   typedef DynamicCapability Calls;
Chris@47:   typedef DynamicCapability Reads;
Chris@47: 
Chris@47:   Client() = default;
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<FromClient<T>>() == Kind::INTERFACE>>
Chris@47:   inline Client(T&& client);
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kj::canConvert<T*, DynamicCapability::Server*>()>>
Chris@47:   inline Client(kj::Own<T>&& server);
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<T>() == Kind::INTERFACE>>
Chris@47:   typename T::Client as();
Chris@47:   template <typename T, typename = kj::EnableIf<kind<T>() == Kind::INTERFACE>>
Chris@47:   typename T::Client releaseAs();
Chris@47:   // Convert to any client type.
Chris@47: 
Chris@47:   Client upcast(InterfaceSchema requestedSchema);
Chris@47:   // Upcast to a superclass.  Throws an exception if `schema` is not a superclass.
Chris@47: 
Chris@47:   inline InterfaceSchema getSchema() { return schema; }
Chris@47: 
Chris@47:   Request<DynamicStruct, DynamicStruct> newRequest(
Chris@47:       InterfaceSchema::Method method, kj::Maybe<MessageSize> sizeHint = nullptr);
Chris@47:   Request<DynamicStruct, DynamicStruct> newRequest(
Chris@47:       kj::StringPtr methodName, kj::Maybe<MessageSize> sizeHint = nullptr);
Chris@47: 
Chris@47: private:
Chris@47:   InterfaceSchema schema;
Chris@47: 
Chris@47:   Client(InterfaceSchema schema, kj::Own<ClientHook>&& hook)
Chris@47:       : Capability::Client(kj::mv(hook)), schema(schema) {}
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   inline Client(InterfaceSchema schema, kj::Own<T>&& server);
Chris@47: 
Chris@47:   friend struct Capability;
Chris@47:   friend struct DynamicStruct;
Chris@47:   friend struct DynamicList;
Chris@47:   friend struct DynamicValue;
Chris@47:   friend class Orphan<DynamicCapability>;
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47:   friend class Orphan<AnyPointer>;
Chris@47:   template <typename T, Kind k>
Chris@47:   friend struct _::PointerHelpers;
Chris@47: };
Chris@47: 
Chris@47: class DynamicCapability::Server: public Capability::Server {
Chris@47: public:
Chris@47:   typedef DynamicCapability Serves;
Chris@47: 
Chris@47:   Server(InterfaceSchema schema): schema(schema) {}
Chris@47: 
Chris@47:   virtual kj::Promise<void> call(InterfaceSchema::Method method,
Chris@47:                                  CallContext<DynamicStruct, DynamicStruct> context) = 0;
Chris@47: 
Chris@47:   kj::Promise<void> dispatchCall(uint64_t interfaceId, uint16_t methodId,
Chris@47:                                  CallContext<AnyPointer, AnyPointer> context) override final;
Chris@47: 
Chris@47:   inline InterfaceSchema getSchema() const { return schema; }
Chris@47: 
Chris@47: private:
Chris@47:   InterfaceSchema schema;
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: class Request<DynamicStruct, DynamicStruct>: public DynamicStruct::Builder {
Chris@47:   // Specialization of `Request<T, U>` for DynamicStruct.
Chris@47: 
Chris@47: public:
Chris@47:   inline Request(DynamicStruct::Builder builder, kj::Own<RequestHook>&& hook,
Chris@47:                  StructSchema resultSchema)
Chris@47:       : DynamicStruct::Builder(builder), hook(kj::mv(hook)), resultSchema(resultSchema) {}
Chris@47: 
Chris@47:   RemotePromise<DynamicStruct> send();
Chris@47:   // Send the call and return a promise for the results.
Chris@47: 
Chris@47: private:
Chris@47:   kj::Own<RequestHook> hook;
Chris@47:   StructSchema resultSchema;
Chris@47: 
Chris@47:   friend class Capability::Client;
Chris@47:   friend struct DynamicCapability;
Chris@47:   template <typename, typename>
Chris@47:   friend class CallContext;
Chris@47:   friend class RequestHook;
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: class CallContext<DynamicStruct, DynamicStruct>: public kj::DisallowConstCopy {
Chris@47:   // Wrapper around CallContextHook with a specific return type.
Chris@47:   //
Chris@47:   // Methods of this class may only be called from within the server's event loop, not from other
Chris@47:   // threads.
Chris@47: 
Chris@47: public:
Chris@47:   explicit CallContext(CallContextHook& hook, StructSchema paramType, StructSchema resultType);
Chris@47: 
Chris@47:   DynamicStruct::Reader getParams();
Chris@47:   void releaseParams();
Chris@47:   DynamicStruct::Builder getResults(kj::Maybe<MessageSize> sizeHint = nullptr);
Chris@47:   DynamicStruct::Builder initResults(kj::Maybe<MessageSize> sizeHint = nullptr);
Chris@47:   void setResults(DynamicStruct::Reader value);
Chris@47:   void adoptResults(Orphan<DynamicStruct>&& value);
Chris@47:   Orphanage getResultsOrphanage(kj::Maybe<MessageSize> sizeHint = nullptr);
Chris@47:   template <typename SubParams>
Chris@47:   kj::Promise<void> tailCall(Request<SubParams, DynamicStruct>&& tailRequest);
Chris@47:   void allowCancellation();
Chris@47: 
Chris@47: private:
Chris@47:   CallContextHook* hook;
Chris@47:   StructSchema paramType;
Chris@47:   StructSchema resultType;
Chris@47: 
Chris@47:   friend class DynamicCapability::Server;
Chris@47: };
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: // Make sure ReaderFor<T> and BuilderFor<T> work for DynamicEnum, DynamicStruct, and
Chris@47: // DynamicList, so that we can define DynamicValue::as().
Chris@47: 
Chris@47: template <> struct ReaderFor_ <DynamicEnum, Kind::OTHER> { typedef DynamicEnum Type; };
Chris@47: template <> struct BuilderFor_<DynamicEnum, Kind::OTHER> { typedef DynamicEnum Type; };
Chris@47: template <> struct ReaderFor_ <DynamicStruct, Kind::OTHER> { typedef DynamicStruct::Reader Type; };
Chris@47: template <> struct BuilderFor_<DynamicStruct, Kind::OTHER> { typedef DynamicStruct::Builder Type; };
Chris@47: template <> struct ReaderFor_ <DynamicList, Kind::OTHER> { typedef DynamicList::Reader Type; };
Chris@47: template <> struct BuilderFor_<DynamicList, Kind::OTHER> { typedef DynamicList::Builder Type; };
Chris@47: template <> struct ReaderFor_ <DynamicCapability, Kind::OTHER> { typedef DynamicCapability::Client Type; };
Chris@47: template <> struct BuilderFor_<DynamicCapability, Kind::OTHER> { typedef DynamicCapability::Client Type; };
Chris@47: template <> struct PipelineFor_<DynamicCapability, Kind::OTHER> { typedef DynamicCapability::Client Type; };
Chris@47: 
Chris@47: class DynamicValue::Reader {
Chris@47: public:
Chris@47:   typedef DynamicValue Reads;
Chris@47: 
Chris@47:   inline Reader(decltype(nullptr) n = nullptr);  // UNKNOWN
Chris@47:   inline Reader(Void value);
Chris@47:   inline Reader(bool value);
Chris@47:   inline Reader(char value);
Chris@47:   inline Reader(signed char value);
Chris@47:   inline Reader(short value);
Chris@47:   inline Reader(int value);
Chris@47:   inline Reader(long value);
Chris@47:   inline Reader(long long value);
Chris@47:   inline Reader(unsigned char value);
Chris@47:   inline Reader(unsigned short value);
Chris@47:   inline Reader(unsigned int value);
Chris@47:   inline Reader(unsigned long value);
Chris@47:   inline Reader(unsigned long long value);
Chris@47:   inline Reader(float value);
Chris@47:   inline Reader(double value);
Chris@47:   inline Reader(const char* value);  // Text
Chris@47:   inline Reader(const Text::Reader& value);
Chris@47:   inline Reader(const Data::Reader& value);
Chris@47:   inline Reader(const DynamicList::Reader& value);
Chris@47:   inline Reader(DynamicEnum value);
Chris@47:   inline Reader(const DynamicStruct::Reader& value);
Chris@47:   inline Reader(const AnyPointer::Reader& value);
Chris@47:   inline Reader(DynamicCapability::Client& value);
Chris@47:   inline Reader(DynamicCapability::Client&& value);
Chris@47:   template <typename T, typename = kj::EnableIf<kj::canConvert<T*, DynamicCapability::Server*>()>>
Chris@47:   inline Reader(kj::Own<T>&& value);
Chris@47:   Reader(ConstSchema constant);
Chris@47: 
Chris@47:   template <typename T, typename = decltype(toDynamic(kj::instance<T>()))>
Chris@47:   inline Reader(T&& value): Reader(toDynamic(kj::mv(value))) {}
Chris@47: 
Chris@47:   Reader(const Reader& other);
Chris@47:   Reader(Reader&& other) noexcept;
Chris@47:   ~Reader() noexcept(false);
Chris@47:   Reader& operator=(const Reader& other);
Chris@47:   Reader& operator=(Reader&& other);
Chris@47:   // Unfortunately, we cannot use the implicit definitions of these since DynamicCapability is not
Chris@47:   // trivially copyable.
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   inline ReaderFor<T> as() const { return AsImpl<T>::apply(*this); }
Chris@47:   // Use to interpret the value as some Cap'n Proto type.  Allowed types are:
Chris@47:   // - Void, bool, [u]int{8,16,32,64}_t, float, double, any enum:  Returns the raw value.
Chris@47:   // - Text, Data, AnyPointer, any struct type:  Returns the corresponding Reader.
Chris@47:   // - List<T> for any T listed above:  Returns List<T>::Reader.
Chris@47:   // - DynamicEnum:  Returns the corresponding type.
Chris@47:   // - DynamicStruct, DynamicList:  Returns the corresponding Reader.
Chris@47:   // - Any capability type, including DynamicCapability:  Returns the corresponding Client.
Chris@47:   //   (TODO(perf):  On GCC 4.8 / Clang 3.3, provide rvalue-qualified version that avoids
Chris@47:   //   refcounting.)
Chris@47:   //
Chris@47:   // DynamicValue allows various implicit conversions, mostly just to make the interface friendlier.
Chris@47:   // - Any integer can be converted to any other integer type so long as the actual value is within
Chris@47:   //   the new type's range.
Chris@47:   // - Floating-point types can be converted to integers as long as no information would be lost
Chris@47:   //   in the conversion.
Chris@47:   // - Integers can be converted to floating points.  This may lose information, but won't throw.
Chris@47:   // - Float32/Float64 can be converted between each other.  Converting Float64 -> Float32 may lose
Chris@47:   //   information, but won't throw.
Chris@47:   // - Text can be converted to an enum, if the Text matches one of the enumerant names (but not
Chris@47:   //   vice-versa).
Chris@47:   // - Capabilities can be upcast (cast to a supertype), but not downcast.
Chris@47:   //
Chris@47:   // Any other conversion attempt will throw an exception.
Chris@47: 
Chris@47:   inline Type getType() const { return type; }
Chris@47:   // Get the type of this value.
Chris@47: 
Chris@47: private:
Chris@47:   Type type;
Chris@47: 
Chris@47:   union {
Chris@47:     Void voidValue;
Chris@47:     bool boolValue;
Chris@47:     int64_t intValue;
Chris@47:     uint64_t uintValue;
Chris@47:     double floatValue;
Chris@47:     Text::Reader textValue;
Chris@47:     Data::Reader dataValue;
Chris@47:     DynamicList::Reader listValue;
Chris@47:     DynamicEnum enumValue;
Chris@47:     DynamicStruct::Reader structValue;
Chris@47:     AnyPointer::Reader anyPointerValue;
Chris@47: 
Chris@47:     mutable DynamicCapability::Client capabilityValue;
Chris@47:     // Declared mutable because `Client`s normally cannot be const.
Chris@47: 
Chris@47:     // Warning:  Copy/move constructors assume all these types are trivially copyable except
Chris@47:     //   Capability.
Chris@47:   };
Chris@47: 
Chris@47:   template <typename T, Kind kind = kind<T>()> struct AsImpl;
Chris@47:   // Implementation backing the as() method.  Needs to be a struct to allow partial
Chris@47:   // specialization.  Has a method apply() which does the work.
Chris@47: 
Chris@47:   friend class Orphanage;  // to speed up newOrphanCopy(DynamicValue::Reader)
Chris@47: };
Chris@47: 
Chris@47: class DynamicValue::Builder {
Chris@47: public:
Chris@47:   typedef DynamicValue Builds;
Chris@47: 
Chris@47:   inline Builder(decltype(nullptr) n = nullptr);  // UNKNOWN
Chris@47:   inline Builder(Void value);
Chris@47:   inline Builder(bool value);
Chris@47:   inline Builder(char value);
Chris@47:   inline Builder(signed char value);
Chris@47:   inline Builder(short value);
Chris@47:   inline Builder(int value);
Chris@47:   inline Builder(long value);
Chris@47:   inline Builder(long long value);
Chris@47:   inline Builder(unsigned char value);
Chris@47:   inline Builder(unsigned short value);
Chris@47:   inline Builder(unsigned int value);
Chris@47:   inline Builder(unsigned long value);
Chris@47:   inline Builder(unsigned long long value);
Chris@47:   inline Builder(float value);
Chris@47:   inline Builder(double value);
Chris@47:   inline Builder(Text::Builder value);
Chris@47:   inline Builder(Data::Builder value);
Chris@47:   inline Builder(DynamicList::Builder value);
Chris@47:   inline Builder(DynamicEnum value);
Chris@47:   inline Builder(DynamicStruct::Builder value);
Chris@47:   inline Builder(AnyPointer::Builder value);
Chris@47:   inline Builder(DynamicCapability::Client& value);
Chris@47:   inline Builder(DynamicCapability::Client&& value);
Chris@47: 
Chris@47:   template <typename T, typename = decltype(toDynamic(kj::instance<T>()))>
Chris@47:   inline Builder(T value): Builder(toDynamic(value)) {}
Chris@47: 
Chris@47:   Builder(Builder& other);
Chris@47:   Builder(Builder&& other) noexcept;
Chris@47:   ~Builder() noexcept(false);
Chris@47:   Builder& operator=(Builder& other);
Chris@47:   Builder& operator=(Builder&& other);
Chris@47:   // Unfortunately, we cannot use the implicit definitions of these since DynamicCapability is not
Chris@47:   // trivially copyable.
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   inline BuilderFor<T> as() { return AsImpl<T>::apply(*this); }
Chris@47:   // See DynamicValue::Reader::as().
Chris@47: 
Chris@47:   inline Type getType() { return type; }
Chris@47:   // Get the type of this value.
Chris@47: 
Chris@47:   Reader asReader() const;
Chris@47: 
Chris@47: private:
Chris@47:   Type type;
Chris@47: 
Chris@47:   union {
Chris@47:     Void voidValue;
Chris@47:     bool boolValue;
Chris@47:     int64_t intValue;
Chris@47:     uint64_t uintValue;
Chris@47:     double floatValue;
Chris@47:     Text::Builder textValue;
Chris@47:     Data::Builder dataValue;
Chris@47:     DynamicList::Builder listValue;
Chris@47:     DynamicEnum enumValue;
Chris@47:     DynamicStruct::Builder structValue;
Chris@47:     AnyPointer::Builder anyPointerValue;
Chris@47: 
Chris@47:     mutable DynamicCapability::Client capabilityValue;
Chris@47:     // Declared mutable because `Client`s normally cannot be const.
Chris@47:   };
Chris@47: 
Chris@47:   template <typename T, Kind kind = kind<T>()> struct AsImpl;
Chris@47:   // Implementation backing the as() method.  Needs to be a struct to allow partial
Chris@47:   // specialization.  Has a method apply() which does the work.
Chris@47: 
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47: };
Chris@47: 
Chris@47: class DynamicValue::Pipeline {
Chris@47: public:
Chris@47:   typedef DynamicValue Pipelines;
Chris@47: 
Chris@47:   inline Pipeline(decltype(nullptr) n = nullptr);
Chris@47:   inline Pipeline(DynamicStruct::Pipeline&& value);
Chris@47:   inline Pipeline(DynamicCapability::Client&& value);
Chris@47: 
Chris@47:   Pipeline(Pipeline&& other) noexcept;
Chris@47:   Pipeline& operator=(Pipeline&& other);
Chris@47:   ~Pipeline() noexcept(false);
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   inline PipelineFor<T> releaseAs() { return AsImpl<T>::apply(*this); }
Chris@47: 
Chris@47:   inline Type getType() { return type; }
Chris@47:   // Get the type of this value.
Chris@47: 
Chris@47: private:
Chris@47:   Type type;
Chris@47:   union {
Chris@47:     DynamicStruct::Pipeline structValue;
Chris@47:     DynamicCapability::Client capabilityValue;
Chris@47:   };
Chris@47: 
Chris@47:   template <typename T, Kind kind = kind<T>()> struct AsImpl;
Chris@47:   // Implementation backing the releaseAs() method.  Needs to be a struct to allow partial
Chris@47:   // specialization.  Has a method apply() which does the work.
Chris@47: };
Chris@47: 
Chris@47: kj::StringTree KJ_STRINGIFY(const DynamicValue::Reader& value);
Chris@47: kj::StringTree KJ_STRINGIFY(const DynamicValue::Builder& value);
Chris@47: kj::StringTree KJ_STRINGIFY(DynamicEnum value);
Chris@47: kj::StringTree KJ_STRINGIFY(const DynamicStruct::Reader& value);
Chris@47: kj::StringTree KJ_STRINGIFY(const DynamicStruct::Builder& value);
Chris@47: kj::StringTree KJ_STRINGIFY(const DynamicList::Reader& value);
Chris@47: kj::StringTree KJ_STRINGIFY(const DynamicList::Builder& value);
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: // Orphan <-> Dynamic glue
Chris@47: 
Chris@47: template <>
Chris@47: class Orphan<DynamicStruct> {
Chris@47: public:
Chris@47:   Orphan() = default;
Chris@47:   KJ_DISALLOW_COPY(Orphan);
Chris@47:   Orphan(Orphan&&) = default;
Chris@47:   Orphan& operator=(Orphan&&) = default;
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<T>() == Kind::STRUCT>>
Chris@47:   inline Orphan(Orphan<T>&& other): schema(Schema::from<T>()), builder(kj::mv(other.builder)) {}
Chris@47: 
Chris@47:   DynamicStruct::Builder get();
Chris@47:   DynamicStruct::Reader getReader() const;
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   Orphan<T> releaseAs();
Chris@47:   // Like DynamicStruct::Builder::as(), but coerces the Orphan type.  Since Orphans are move-only,
Chris@47:   // the original Orphan<DynamicStruct> is no longer valid after this call; ownership is
Chris@47:   // transferred to the returned Orphan<T>.
Chris@47: 
Chris@47:   inline bool operator==(decltype(nullptr)) const { return builder == nullptr; }
Chris@47:   inline bool operator!=(decltype(nullptr)) const { return builder != nullptr; }
Chris@47: 
Chris@47: private:
Chris@47:   StructSchema schema;
Chris@47:   _::OrphanBuilder builder;
Chris@47: 
Chris@47:   inline Orphan(StructSchema schema, _::OrphanBuilder&& builder)
Chris@47:       : schema(schema), builder(kj::mv(builder)) {}
Chris@47: 
Chris@47:   template <typename, Kind>
Chris@47:   friend struct _::PointerHelpers;
Chris@47:   friend struct DynamicList;
Chris@47:   friend class Orphanage;
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47:   friend class Orphan<AnyPointer>;
Chris@47:   friend class MessageBuilder;
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: class Orphan<DynamicList> {
Chris@47: public:
Chris@47:   Orphan() = default;
Chris@47:   KJ_DISALLOW_COPY(Orphan);
Chris@47:   Orphan(Orphan&&) = default;
Chris@47:   Orphan& operator=(Orphan&&) = default;
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<T>() == Kind::LIST>>
Chris@47:   inline Orphan(Orphan<T>&& other): schema(Schema::from<T>()), builder(kj::mv(other.builder)) {}
Chris@47: 
Chris@47:   DynamicList::Builder get();
Chris@47:   DynamicList::Reader getReader() const;
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   Orphan<T> releaseAs();
Chris@47:   // Like DynamicList::Builder::as(), but coerces the Orphan type.  Since Orphans are move-only,
Chris@47:   // the original Orphan<DynamicStruct> is no longer valid after this call; ownership is
Chris@47:   // transferred to the returned Orphan<T>.
Chris@47: 
Chris@47:   // TODO(someday): Support truncate().
Chris@47: 
Chris@47:   inline bool operator==(decltype(nullptr)) const { return builder == nullptr; }
Chris@47:   inline bool operator!=(decltype(nullptr)) const { return builder != nullptr; }
Chris@47: 
Chris@47: private:
Chris@47:   ListSchema schema;
Chris@47:   _::OrphanBuilder builder;
Chris@47: 
Chris@47:   inline Orphan(ListSchema schema, _::OrphanBuilder&& builder)
Chris@47:       : schema(schema), builder(kj::mv(builder)) {}
Chris@47: 
Chris@47:   template <typename, Kind>
Chris@47:   friend struct _::PointerHelpers;
Chris@47:   friend struct DynamicList;
Chris@47:   friend class Orphanage;
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47:   friend class Orphan<AnyPointer>;
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: class Orphan<DynamicCapability> {
Chris@47: public:
Chris@47:   Orphan() = default;
Chris@47:   KJ_DISALLOW_COPY(Orphan);
Chris@47:   Orphan(Orphan&&) = default;
Chris@47:   Orphan& operator=(Orphan&&) = default;
Chris@47: 
Chris@47:   template <typename T, typename = kj::EnableIf<kind<T>() == Kind::INTERFACE>>
Chris@47:   inline Orphan(Orphan<T>&& other): schema(Schema::from<T>()), builder(kj::mv(other.builder)) {}
Chris@47: 
Chris@47:   DynamicCapability::Client get();
Chris@47:   DynamicCapability::Client getReader() const;
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   Orphan<T> releaseAs();
Chris@47:   // Like DynamicCapability::Client::as(), but coerces the Orphan type.  Since Orphans are move-only,
Chris@47:   // the original Orphan<DynamicCapability> is no longer valid after this call; ownership is
Chris@47:   // transferred to the returned Orphan<T>.
Chris@47: 
Chris@47:   inline bool operator==(decltype(nullptr)) const { return builder == nullptr; }
Chris@47:   inline bool operator!=(decltype(nullptr)) const { return builder != nullptr; }
Chris@47: 
Chris@47: private:
Chris@47:   InterfaceSchema schema;
Chris@47:   _::OrphanBuilder builder;
Chris@47: 
Chris@47:   inline Orphan(InterfaceSchema schema, _::OrphanBuilder&& builder)
Chris@47:       : schema(schema), builder(kj::mv(builder)) {}
Chris@47: 
Chris@47:   template <typename, Kind>
Chris@47:   friend struct _::PointerHelpers;
Chris@47:   friend struct DynamicList;
Chris@47:   friend class Orphanage;
Chris@47:   friend class Orphan<DynamicValue>;
Chris@47:   friend class Orphan<AnyPointer>;
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: class Orphan<DynamicValue> {
Chris@47: public:
Chris@47:   inline Orphan(decltype(nullptr) n = nullptr): type(DynamicValue::UNKNOWN) {}
Chris@47:   inline Orphan(Void value);
Chris@47:   inline Orphan(bool value);
Chris@47:   inline Orphan(char value);
Chris@47:   inline Orphan(signed char value);
Chris@47:   inline Orphan(short value);
Chris@47:   inline Orphan(int value);
Chris@47:   inline Orphan(long value);
Chris@47:   inline Orphan(long long value);
Chris@47:   inline Orphan(unsigned char value);
Chris@47:   inline Orphan(unsigned short value);
Chris@47:   inline Orphan(unsigned int value);
Chris@47:   inline Orphan(unsigned long value);
Chris@47:   inline Orphan(unsigned long long value);
Chris@47:   inline Orphan(float value);
Chris@47:   inline Orphan(double value);
Chris@47:   inline Orphan(DynamicEnum value);
Chris@47:   Orphan(Orphan&&) = default;
Chris@47:   template <typename T>
Chris@47:   Orphan(Orphan<T>&&);
Chris@47:   Orphan(Orphan<AnyPointer>&&);
Chris@47:   Orphan(void*) = delete;  // So Orphan(bool) doesn't accept pointers.
Chris@47:   KJ_DISALLOW_COPY(Orphan);
Chris@47: 
Chris@47:   Orphan& operator=(Orphan&&) = default;
Chris@47: 
Chris@47:   inline DynamicValue::Type getType() { return type; }
Chris@47: 
Chris@47:   DynamicValue::Builder get();
Chris@47:   DynamicValue::Reader getReader() const;
Chris@47: 
Chris@47:   template <typename T>
Chris@47:   Orphan<T> releaseAs();
Chris@47:   // Like DynamicValue::Builder::as(), but coerces the Orphan type.  Since Orphans are move-only,
Chris@47:   // the original Orphan<DynamicStruct> is no longer valid after this call; ownership is
Chris@47:   // transferred to the returned Orphan<T>.
Chris@47: 
Chris@47: private:
Chris@47:   DynamicValue::Type type;
Chris@47:   union {
Chris@47:     Void voidValue;
Chris@47:     bool boolValue;
Chris@47:     int64_t intValue;
Chris@47:     uint64_t uintValue;
Chris@47:     double floatValue;
Chris@47:     DynamicEnum enumValue;
Chris@47:     StructSchema structSchema;
Chris@47:     ListSchema listSchema;
Chris@47:     InterfaceSchema interfaceSchema;
Chris@47:   };
Chris@47: 
Chris@47:   _::OrphanBuilder builder;
Chris@47:   // Only used if `type` is a pointer type.
Chris@47: 
Chris@47:   Orphan(DynamicValue::Builder value, _::OrphanBuilder&& builder);
Chris@47:   Orphan(DynamicValue::Type type, _::OrphanBuilder&& builder)
Chris@47:       : type(type), builder(kj::mv(builder)) {}
Chris@47:   Orphan(StructSchema structSchema, _::OrphanBuilder&& builder)
Chris@47:       : type(DynamicValue::STRUCT), structSchema(structSchema), builder(kj::mv(builder)) {}
Chris@47:   Orphan(ListSchema listSchema, _::OrphanBuilder&& builder)
Chris@47:       : type(DynamicValue::LIST), listSchema(listSchema), builder(kj::mv(builder)) {}
Chris@47: 
Chris@47:   template <typename, Kind>
Chris@47:   friend struct _::PointerHelpers;
Chris@47:   friend struct DynamicStruct;
Chris@47:   friend struct DynamicList;
Chris@47:   friend struct AnyPointer;
Chris@47:   friend class Orphanage;
Chris@47: };
Chris@47: 
Chris@47: template <typename T>
Chris@47: inline Orphan<DynamicValue>::Orphan(Orphan<T>&& other)
Chris@47:     : Orphan(other.get(), kj::mv(other.builder)) {}
Chris@47: 
Chris@47: inline Orphan<DynamicValue>::Orphan(Orphan<AnyPointer>&& other)
Chris@47:     : type(DynamicValue::ANY_POINTER), builder(kj::mv(other.builder)) {}
Chris@47: 
Chris@47: template <typename T>
Chris@47: Orphan<T> Orphan<DynamicStruct>::releaseAs() {
Chris@47:   get().as<T>();  // type check
Chris@47:   return Orphan<T>(kj::mv(builder));
Chris@47: }
Chris@47: 
Chris@47: template <typename T>
Chris@47: Orphan<T> Orphan<DynamicList>::releaseAs() {
Chris@47:   get().as<T>();  // type check
Chris@47:   return Orphan<T>(kj::mv(builder));
Chris@47: }
Chris@47: 
Chris@47: template <typename T>
Chris@47: Orphan<T> Orphan<DynamicCapability>::releaseAs() {
Chris@47:   get().as<T>();  // type check
Chris@47:   return Orphan<T>(kj::mv(builder));
Chris@47: }
Chris@47: 
Chris@47: template <typename T>
Chris@47: Orphan<T> Orphan<DynamicValue>::releaseAs() {
Chris@47:   get().as<T>();  // type check
Chris@47:   type = DynamicValue::UNKNOWN;
Chris@47:   return Orphan<T>(kj::mv(builder));
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: Orphan<AnyPointer> Orphan<DynamicValue>::releaseAs<AnyPointer>();
Chris@47: template <>
Chris@47: Orphan<DynamicStruct> Orphan<DynamicValue>::releaseAs<DynamicStruct>();
Chris@47: template <>
Chris@47: Orphan<DynamicList> Orphan<DynamicValue>::releaseAs<DynamicList>();
Chris@47: template <>
Chris@47: Orphan<DynamicCapability> Orphan<DynamicValue>::releaseAs<DynamicCapability>();
Chris@47: 
Chris@47: template <>
Chris@47: struct Orphanage::GetInnerBuilder<DynamicStruct, Kind::OTHER> {
Chris@47:   static inline _::StructBuilder apply(DynamicStruct::Builder& t) {
Chris@47:     return t.builder;
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: struct Orphanage::GetInnerBuilder<DynamicList, Kind::OTHER> {
Chris@47:   static inline _::ListBuilder apply(DynamicList::Builder& t) {
Chris@47:     return t.builder;
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: inline Orphan<DynamicStruct> Orphanage::newOrphanCopy<DynamicStruct::Reader>(
Chris@47:     DynamicStruct::Reader copyFrom) const {
Chris@47:   return Orphan<DynamicStruct>(
Chris@47:       copyFrom.getSchema(), _::OrphanBuilder::copy(arena, capTable, copyFrom.reader));
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: inline Orphan<DynamicList> Orphanage::newOrphanCopy<DynamicList::Reader>(
Chris@47:     DynamicList::Reader copyFrom) const {
Chris@47:   return Orphan<DynamicList>(copyFrom.getSchema(),
Chris@47:       _::OrphanBuilder::copy(arena, capTable, copyFrom.reader));
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: inline Orphan<DynamicCapability> Orphanage::newOrphanCopy<DynamicCapability::Client>(
Chris@47:     DynamicCapability::Client copyFrom) const {
Chris@47:   return Orphan<DynamicCapability>(
Chris@47:       copyFrom.getSchema(), _::OrphanBuilder::copy(arena, capTable, copyFrom.hook->addRef()));
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: Orphan<DynamicValue> Orphanage::newOrphanCopy<DynamicValue::Reader>(
Chris@47:     DynamicValue::Reader copyFrom) const;
Chris@47: 
Chris@47: namespace _ {  // private
Chris@47: 
Chris@47: template <>
Chris@47: struct PointerHelpers<DynamicStruct, Kind::OTHER> {
Chris@47:   // getDynamic() is used when an AnyPointer's get() accessor is passed arguments, because for
Chris@47:   // non-dynamic types PointerHelpers::get() takes a default value as the third argument, and we
Chris@47:   // don't want people to accidentally be able to provide their own default value.
Chris@47:   static DynamicStruct::Reader getDynamic(PointerReader reader, StructSchema schema);
Chris@47:   static DynamicStruct::Builder getDynamic(PointerBuilder builder, StructSchema schema);
Chris@47:   static void set(PointerBuilder builder, const DynamicStruct::Reader& value);
Chris@47:   static DynamicStruct::Builder init(PointerBuilder builder, StructSchema schema);
Chris@47:   static inline void adopt(PointerBuilder builder, Orphan<DynamicStruct>&& value) {
Chris@47:     builder.adopt(kj::mv(value.builder));
Chris@47:   }
Chris@47:   static inline Orphan<DynamicStruct> disown(PointerBuilder builder, StructSchema schema) {
Chris@47:     return Orphan<DynamicStruct>(schema, builder.disown());
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: struct PointerHelpers<DynamicList, Kind::OTHER> {
Chris@47:   // getDynamic() is used when an AnyPointer's get() accessor is passed arguments, because for
Chris@47:   // non-dynamic types PointerHelpers::get() takes a default value as the third argument, and we
Chris@47:   // don't want people to accidentally be able to provide their own default value.
Chris@47:   static DynamicList::Reader getDynamic(PointerReader reader, ListSchema schema);
Chris@47:   static DynamicList::Builder getDynamic(PointerBuilder builder, ListSchema schema);
Chris@47:   static void set(PointerBuilder builder, const DynamicList::Reader& value);
Chris@47:   static DynamicList::Builder init(PointerBuilder builder, ListSchema schema, uint size);
Chris@47:   static inline void adopt(PointerBuilder builder, Orphan<DynamicList>&& value) {
Chris@47:     builder.adopt(kj::mv(value.builder));
Chris@47:   }
Chris@47:   static inline Orphan<DynamicList> disown(PointerBuilder builder, ListSchema schema) {
Chris@47:     return Orphan<DynamicList>(schema, builder.disown());
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <>
Chris@47: struct PointerHelpers<DynamicCapability, Kind::OTHER> {
Chris@47:   // getDynamic() is used when an AnyPointer's get() accessor is passed arguments, because for
Chris@47:   // non-dynamic types PointerHelpers::get() takes a default value as the third argument, and we
Chris@47:   // don't want people to accidentally be able to provide their own default value.
Chris@47:   static DynamicCapability::Client getDynamic(PointerReader reader, InterfaceSchema schema);
Chris@47:   static DynamicCapability::Client getDynamic(PointerBuilder builder, InterfaceSchema schema);
Chris@47:   static void set(PointerBuilder builder, DynamicCapability::Client& value);
Chris@47:   static void set(PointerBuilder builder, DynamicCapability::Client&& value);
Chris@47:   static inline void adopt(PointerBuilder builder, Orphan<DynamicCapability>&& value) {
Chris@47:     builder.adopt(kj::mv(value.builder));
Chris@47:   }
Chris@47:   static inline Orphan<DynamicCapability> disown(PointerBuilder builder, InterfaceSchema schema) {
Chris@47:     return Orphan<DynamicCapability>(schema, builder.disown());
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: }  // namespace _ (private)
Chris@47: 
Chris@47: template <typename T>
Chris@47: inline ReaderFor<T> AnyPointer::Reader::getAs(StructSchema schema) const {
Chris@47:   return _::PointerHelpers<T>::getDynamic(reader, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline ReaderFor<T> AnyPointer::Reader::getAs(ListSchema schema) const {
Chris@47:   return _::PointerHelpers<T>::getDynamic(reader, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline ReaderFor<T> AnyPointer::Reader::getAs(InterfaceSchema schema) const {
Chris@47:   return _::PointerHelpers<T>::getDynamic(reader, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline BuilderFor<T> AnyPointer::Builder::getAs(StructSchema schema) {
Chris@47:   return _::PointerHelpers<T>::getDynamic(builder, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline BuilderFor<T> AnyPointer::Builder::getAs(ListSchema schema) {
Chris@47:   return _::PointerHelpers<T>::getDynamic(builder, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline BuilderFor<T> AnyPointer::Builder::getAs(InterfaceSchema schema) {
Chris@47:   return _::PointerHelpers<T>::getDynamic(builder, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline BuilderFor<T> AnyPointer::Builder::initAs(StructSchema schema) {
Chris@47:   return _::PointerHelpers<T>::init(builder, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline BuilderFor<T> AnyPointer::Builder::initAs(ListSchema schema, uint elementCount) {
Chris@47:   return _::PointerHelpers<T>::init(builder, schema, elementCount);
Chris@47: }
Chris@47: template <>
Chris@47: inline void AnyPointer::Builder::setAs<DynamicStruct>(DynamicStruct::Reader value) {
Chris@47:   return _::PointerHelpers<DynamicStruct>::set(builder, value);
Chris@47: }
Chris@47: template <>
Chris@47: inline void AnyPointer::Builder::setAs<DynamicList>(DynamicList::Reader value) {
Chris@47:   return _::PointerHelpers<DynamicList>::set(builder, value);
Chris@47: }
Chris@47: template <>
Chris@47: inline void AnyPointer::Builder::setAs<DynamicCapability>(DynamicCapability::Client value) {
Chris@47:   return _::PointerHelpers<DynamicCapability>::set(builder, kj::mv(value));
Chris@47: }
Chris@47: template <>
Chris@47: void AnyPointer::Builder::adopt<DynamicValue>(Orphan<DynamicValue>&& orphan);
Chris@47: template <typename T>
Chris@47: inline Orphan<T> AnyPointer::Builder::disownAs(StructSchema schema) {
Chris@47:   return _::PointerHelpers<T>::disown(builder, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline Orphan<T> AnyPointer::Builder::disownAs(ListSchema schema) {
Chris@47:   return _::PointerHelpers<T>::disown(builder, schema);
Chris@47: }
Chris@47: template <typename T>
Chris@47: inline Orphan<T> AnyPointer::Builder::disownAs(InterfaceSchema schema) {
Chris@47:   return _::PointerHelpers<T>::disown(builder, schema);
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: DynamicStruct::Builder Orphan<AnyPointer>::getAs<DynamicStruct>(StructSchema schema);
Chris@47: template <>
Chris@47: DynamicList::Builder Orphan<AnyPointer>::getAs<DynamicList>(ListSchema schema);
Chris@47: template <>
Chris@47: DynamicCapability::Client Orphan<AnyPointer>::getAs<DynamicCapability>(InterfaceSchema schema);
Chris@47: template <>
Chris@47: DynamicStruct::Reader Orphan<AnyPointer>::getAsReader<DynamicStruct>(StructSchema schema) const;
Chris@47: template <>
Chris@47: DynamicList::Reader Orphan<AnyPointer>::getAsReader<DynamicList>(ListSchema schema) const;
Chris@47: template <>
Chris@47: DynamicCapability::Client Orphan<AnyPointer>::getAsReader<DynamicCapability>(
Chris@47:     InterfaceSchema schema) const;
Chris@47: template <>
Chris@47: Orphan<DynamicStruct> Orphan<AnyPointer>::releaseAs<DynamicStruct>(StructSchema schema);
Chris@47: template <>
Chris@47: Orphan<DynamicList> Orphan<AnyPointer>::releaseAs<DynamicList>(ListSchema schema);
Chris@47: template <>
Chris@47: Orphan<DynamicCapability> Orphan<AnyPointer>::releaseAs<DynamicCapability>(
Chris@47:     InterfaceSchema schema);
Chris@47: 
Chris@47: // =======================================================================================
Chris@47: // Inline implementation details.
Chris@47: 
Chris@47: template <typename T>
Chris@47: struct ToDynamic_<T, Kind::STRUCT> {
Chris@47:   static inline DynamicStruct::Reader apply(const typename T::Reader& value) {
Chris@47:     return DynamicStruct::Reader(Schema::from<T>(), value._reader);
Chris@47:   }
Chris@47:   static inline DynamicStruct::Builder apply(typename T::Builder& value) {
Chris@47:     return DynamicStruct::Builder(Schema::from<T>(), value._builder);
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <typename T>
Chris@47: struct ToDynamic_<T, Kind::LIST> {
Chris@47:   static inline DynamicList::Reader apply(const typename T::Reader& value) {
Chris@47:     return DynamicList::Reader(Schema::from<T>(), value.reader);
Chris@47:   }
Chris@47:   static inline DynamicList::Builder apply(typename T::Builder& value) {
Chris@47:     return DynamicList::Builder(Schema::from<T>(), value.builder);
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <typename T>
Chris@47: struct ToDynamic_<T, Kind::INTERFACE> {
Chris@47:   static inline DynamicCapability::Client apply(typename T::Client value) {
Chris@47:     return DynamicCapability::Client(kj::mv(value));
Chris@47:   }
Chris@47:   static inline DynamicCapability::Client apply(typename T::Client&& value) {
Chris@47:     return DynamicCapability::Client(kj::mv(value));
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <typename T>
Chris@47: ReaderFor<DynamicTypeFor<FromReader<T>>> toDynamic(T&& value) {
Chris@47:   return ToDynamic_<FromReader<T>>::apply(value);
Chris@47: }
Chris@47: template <typename T>
Chris@47: BuilderFor<DynamicTypeFor<FromBuilder<T>>> toDynamic(T&& value) {
Chris@47:   return ToDynamic_<FromBuilder<T>>::apply(value);
Chris@47: }
Chris@47: template <typename T>
Chris@47: DynamicTypeFor<TypeIfEnum<T>> toDynamic(T&& value) {
Chris@47:   return DynamicEnum(Schema::from<kj::Decay<T>>(), static_cast<uint16_t>(value));
Chris@47: }
Chris@47: template <typename T>
Chris@47: typename DynamicTypeFor<FromServer<T>>::Client toDynamic(kj::Own<T>&& value) {
Chris@47:   return typename FromServer<T>::Client(kj::mv(value));
Chris@47: }
Chris@47: 
Chris@47: inline DynamicValue::Reader::Reader(std::nullptr_t n): type(UNKNOWN) {}
Chris@47: inline DynamicValue::Builder::Builder(std::nullptr_t n): type(UNKNOWN) {}
Chris@47: 
Chris@47: #define CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(cppType, typeTag, fieldName) \
Chris@47: inline DynamicValue::Reader::Reader(cppType value) \
Chris@47:     : type(typeTag), fieldName##Value(value) {} \
Chris@47: inline DynamicValue::Builder::Builder(cppType value) \
Chris@47:     : type(typeTag), fieldName##Value(value) {} \
Chris@47: inline Orphan<DynamicValue>::Orphan(cppType value) \
Chris@47:     : type(DynamicValue::typeTag), fieldName##Value(value) {}
Chris@47: 
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(Void, VOID, void);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(bool, BOOL, bool);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(char, INT, int);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(signed char, INT, int);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(short, INT, int);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(int, INT, int);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(long, INT, int);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(long long, INT, int);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(unsigned char, UINT, uint);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(unsigned short, UINT, uint);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(unsigned int, UINT, uint);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(unsigned long, UINT, uint);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(unsigned long long, UINT, uint);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(float, FLOAT, float);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(double, FLOAT, float);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(DynamicEnum, ENUM, enum);
Chris@47: #undef CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR
Chris@47: 
Chris@47: #define CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(cppType, typeTag, fieldName) \
Chris@47: inline DynamicValue::Reader::Reader(const cppType::Reader& value) \
Chris@47:     : type(typeTag), fieldName##Value(value) {} \
Chris@47: inline DynamicValue::Builder::Builder(cppType::Builder value) \
Chris@47:     : type(typeTag), fieldName##Value(value) {}
Chris@47: 
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(Text, TEXT, text);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(Data, DATA, data);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(DynamicList, LIST, list);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(DynamicStruct, STRUCT, struct);
Chris@47: CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR(AnyPointer, ANY_POINTER, anyPointer);
Chris@47: 
Chris@47: #undef CAPNP_DECLARE_DYNAMIC_VALUE_CONSTRUCTOR
Chris@47: 
Chris@47: inline DynamicValue::Reader::Reader(DynamicCapability::Client& value)
Chris@47:     : type(CAPABILITY), capabilityValue(value) {}
Chris@47: inline DynamicValue::Reader::Reader(DynamicCapability::Client&& value)
Chris@47:     : type(CAPABILITY), capabilityValue(kj::mv(value)) {}
Chris@47: template <typename T, typename>
Chris@47: inline DynamicValue::Reader::Reader(kj::Own<T>&& value)
Chris@47:     : type(CAPABILITY), capabilityValue(kj::mv(value)) {}
Chris@47: inline DynamicValue::Builder::Builder(DynamicCapability::Client& value)
Chris@47:     : type(CAPABILITY), capabilityValue(value) {}
Chris@47: inline DynamicValue::Builder::Builder(DynamicCapability::Client&& value)
Chris@47:     : type(CAPABILITY), capabilityValue(kj::mv(value)) {}
Chris@47: 
Chris@47: inline DynamicValue::Reader::Reader(const char* value): Reader(Text::Reader(value)) {}
Chris@47: 
Chris@47: #define CAPNP_DECLARE_TYPE(discrim, typeName) \
Chris@47: template <> \
Chris@47: struct DynamicValue::Reader::AsImpl<typeName> { \
Chris@47:   static ReaderFor<typeName> apply(const Reader& reader); \
Chris@47: }; \
Chris@47: template <> \
Chris@47: struct DynamicValue::Builder::AsImpl<typeName> { \
Chris@47:   static BuilderFor<typeName> apply(Builder& builder); \
Chris@47: };
Chris@47: 
Chris@47: //CAPNP_DECLARE_TYPE(VOID, Void)
Chris@47: CAPNP_DECLARE_TYPE(BOOL, bool)
Chris@47: CAPNP_DECLARE_TYPE(INT8, int8_t)
Chris@47: CAPNP_DECLARE_TYPE(INT16, int16_t)
Chris@47: CAPNP_DECLARE_TYPE(INT32, int32_t)
Chris@47: CAPNP_DECLARE_TYPE(INT64, int64_t)
Chris@47: CAPNP_DECLARE_TYPE(UINT8, uint8_t)
Chris@47: CAPNP_DECLARE_TYPE(UINT16, uint16_t)
Chris@47: CAPNP_DECLARE_TYPE(UINT32, uint32_t)
Chris@47: CAPNP_DECLARE_TYPE(UINT64, uint64_t)
Chris@47: CAPNP_DECLARE_TYPE(FLOAT32, float)
Chris@47: CAPNP_DECLARE_TYPE(FLOAT64, double)
Chris@47: 
Chris@47: CAPNP_DECLARE_TYPE(TEXT, Text)
Chris@47: CAPNP_DECLARE_TYPE(DATA, Data)
Chris@47: CAPNP_DECLARE_TYPE(LIST, DynamicList)
Chris@47: CAPNP_DECLARE_TYPE(STRUCT, DynamicStruct)
Chris@47: CAPNP_DECLARE_TYPE(INTERFACE, DynamicCapability)
Chris@47: CAPNP_DECLARE_TYPE(ENUM, DynamicEnum)
Chris@47: CAPNP_DECLARE_TYPE(ANY_POINTER, AnyPointer)
Chris@47: #undef CAPNP_DECLARE_TYPE
Chris@47: 
Chris@47: // CAPNP_DECLARE_TYPE(Void) causes gcc 4.7 to segfault.  If I do it manually and remove the
Chris@47: // ReaderFor<> and BuilderFor<> wrappers, it works.
Chris@47: template <>
Chris@47: struct DynamicValue::Reader::AsImpl<Void> {
Chris@47:   static Void apply(const Reader& reader);
Chris@47: };
Chris@47: template <>
Chris@47: struct DynamicValue::Builder::AsImpl<Void> {
Chris@47:   static Void apply(Builder& builder);
Chris@47: };
Chris@47: 
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Reader::AsImpl<T, Kind::ENUM> {
Chris@47:   static T apply(const Reader& reader) {
Chris@47:     return reader.as<DynamicEnum>().as<T>();
Chris@47:   }
Chris@47: };
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Builder::AsImpl<T, Kind::ENUM> {
Chris@47:   static T apply(Builder& builder) {
Chris@47:     return builder.as<DynamicEnum>().as<T>();
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Reader::AsImpl<T, Kind::STRUCT> {
Chris@47:   static typename T::Reader apply(const Reader& reader) {
Chris@47:     return reader.as<DynamicStruct>().as<T>();
Chris@47:   }
Chris@47: };
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Builder::AsImpl<T, Kind::STRUCT> {
Chris@47:   static typename T::Builder apply(Builder& builder) {
Chris@47:     return builder.as<DynamicStruct>().as<T>();
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Reader::AsImpl<T, Kind::LIST> {
Chris@47:   static typename T::Reader apply(const Reader& reader) {
Chris@47:     return reader.as<DynamicList>().as<T>();
Chris@47:   }
Chris@47: };
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Builder::AsImpl<T, Kind::LIST> {
Chris@47:   static typename T::Builder apply(Builder& builder) {
Chris@47:     return builder.as<DynamicList>().as<T>();
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Reader::AsImpl<T, Kind::INTERFACE> {
Chris@47:   static typename T::Client apply(const Reader& reader) {
Chris@47:     return reader.as<DynamicCapability>().as<T>();
Chris@47:   }
Chris@47: };
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Builder::AsImpl<T, Kind::INTERFACE> {
Chris@47:   static typename T::Client apply(Builder& builder) {
Chris@47:     return builder.as<DynamicCapability>().as<T>();
Chris@47:   }
Chris@47: };
Chris@47: 
Chris@47: inline DynamicValue::Pipeline::Pipeline(std::nullptr_t n): type(UNKNOWN) {}
Chris@47: inline DynamicValue::Pipeline::Pipeline(DynamicStruct::Pipeline&& value)
Chris@47:     : type(STRUCT), structValue(kj::mv(value)) {}
Chris@47: inline DynamicValue::Pipeline::Pipeline(DynamicCapability::Client&& value)
Chris@47:     : type(CAPABILITY), capabilityValue(kj::mv(value)) {}
Chris@47: 
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Pipeline::AsImpl<T, Kind::STRUCT> {
Chris@47:   static typename T::Pipeline apply(Pipeline& pipeline) {
Chris@47:     return pipeline.releaseAs<DynamicStruct>().releaseAs<T>();
Chris@47:   }
Chris@47: };
Chris@47: template <typename T>
Chris@47: struct DynamicValue::Pipeline::AsImpl<T, Kind::INTERFACE> {
Chris@47:   static typename T::Client apply(Pipeline& pipeline) {
Chris@47:     return pipeline.releaseAs<DynamicCapability>().releaseAs<T>();
Chris@47:   }
Chris@47: };
Chris@47: template <>
Chris@47: struct DynamicValue::Pipeline::AsImpl<DynamicStruct, Kind::OTHER> {
Chris@47:   static PipelineFor<DynamicStruct> apply(Pipeline& pipeline);
Chris@47: };
Chris@47: template <>
Chris@47: struct DynamicValue::Pipeline::AsImpl<DynamicCapability, Kind::OTHER> {
Chris@47:   static PipelineFor<DynamicCapability> apply(Pipeline& pipeline);
Chris@47: };
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: template <typename T>
Chris@47: typename T::Reader DynamicStruct::Reader::as() const {
Chris@47:   static_assert(kind<T>() == Kind::STRUCT,
Chris@47:                 "DynamicStruct::Reader::as<T>() can only convert to struct types.");
Chris@47:   schema.requireUsableAs<T>();
Chris@47:   return typename T::Reader(reader);
Chris@47: }
Chris@47: 
Chris@47: template <typename T>
Chris@47: typename T::Builder DynamicStruct::Builder::as() {
Chris@47:   static_assert(kind<T>() == Kind::STRUCT,
Chris@47:                 "DynamicStruct::Builder::as<T>() can only convert to struct types.");
Chris@47:   schema.requireUsableAs<T>();
Chris@47:   return typename T::Builder(builder);
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: inline DynamicStruct::Reader DynamicStruct::Reader::as<DynamicStruct>() const {
Chris@47:   return *this;
Chris@47: }
Chris@47: template <>
Chris@47: inline DynamicStruct::Builder DynamicStruct::Builder::as<DynamicStruct>() {
Chris@47:   return *this;
Chris@47: }
Chris@47: 
Chris@47: inline DynamicStruct::Reader DynamicStruct::Builder::asReader() const {
Chris@47:   return DynamicStruct::Reader(schema, builder.asReader());
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: inline AnyStruct::Reader DynamicStruct::Reader::as<AnyStruct>() const {
Chris@47:   return AnyStruct::Reader(reader);
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: inline AnyStruct::Builder DynamicStruct::Builder::as<AnyStruct>() {
Chris@47:   return AnyStruct::Builder(builder);
Chris@47: }
Chris@47: 
Chris@47: template <typename T>
Chris@47: typename T::Pipeline DynamicStruct::Pipeline::releaseAs() {
Chris@47:   static_assert(kind<T>() == Kind::STRUCT,
Chris@47:                 "DynamicStruct::Pipeline::releaseAs<T>() can only convert to struct types.");
Chris@47:   schema.requireUsableAs<T>();
Chris@47:   return typename T::Pipeline(kj::mv(typeless));
Chris@47: }
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: template <typename T>
Chris@47: typename T::Reader DynamicList::Reader::as() const {
Chris@47:   static_assert(kind<T>() == Kind::LIST,
Chris@47:                 "DynamicStruct::Reader::as<T>() can only convert to list types.");
Chris@47:   schema.requireUsableAs<T>();
Chris@47:   return typename T::Reader(reader);
Chris@47: }
Chris@47: template <typename T>
Chris@47: typename T::Builder DynamicList::Builder::as() {
Chris@47:   static_assert(kind<T>() == Kind::LIST,
Chris@47:                 "DynamicStruct::Builder::as<T>() can only convert to list types.");
Chris@47:   schema.requireUsableAs<T>();
Chris@47:   return typename T::Builder(builder);
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: inline DynamicList::Reader DynamicList::Reader::as<DynamicList>() const {
Chris@47:   return *this;
Chris@47: }
Chris@47: template <>
Chris@47: inline DynamicList::Builder DynamicList::Builder::as<DynamicList>() {
Chris@47:   return *this;
Chris@47: }
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: template <typename T, typename>
Chris@47: inline DynamicCapability::Client::Client(T&& client)
Chris@47:     : Capability::Client(kj::mv(client)), schema(Schema::from<FromClient<T>>()) {}
Chris@47: 
Chris@47: template <typename T, typename>
Chris@47: inline DynamicCapability::Client::Client(kj::Own<T>&& server)
Chris@47:     : Client(server->getSchema(), kj::mv(server)) {}
Chris@47: template <typename T>
Chris@47: inline DynamicCapability::Client::Client(InterfaceSchema schema, kj::Own<T>&& server)
Chris@47:     : Capability::Client(kj::mv(server)), schema(schema) {}
Chris@47: 
Chris@47: template <typename T, typename>
Chris@47: typename T::Client DynamicCapability::Client::as() {
Chris@47:   static_assert(kind<T>() == Kind::INTERFACE,
Chris@47:                 "DynamicCapability::Client::as<T>() can only convert to interface types.");
Chris@47:   schema.requireUsableAs<T>();
Chris@47:   return typename T::Client(hook->addRef());
Chris@47: }
Chris@47: 
Chris@47: template <typename T, typename>
Chris@47: typename T::Client DynamicCapability::Client::releaseAs() {
Chris@47:   static_assert(kind<T>() == Kind::INTERFACE,
Chris@47:                 "DynamicCapability::Client::as<T>() can only convert to interface types.");
Chris@47:   schema.requireUsableAs<T>();
Chris@47:   return typename T::Client(kj::mv(hook));
Chris@47: }
Chris@47: 
Chris@47: inline CallContext<DynamicStruct, DynamicStruct>::CallContext(
Chris@47:     CallContextHook& hook, StructSchema paramType, StructSchema resultType)
Chris@47:     : hook(&hook), paramType(paramType), resultType(resultType) {}
Chris@47: inline DynamicStruct::Reader CallContext<DynamicStruct, DynamicStruct>::getParams() {
Chris@47:   return hook->getParams().getAs<DynamicStruct>(paramType);
Chris@47: }
Chris@47: inline void CallContext<DynamicStruct, DynamicStruct>::releaseParams() {
Chris@47:   hook->releaseParams();
Chris@47: }
Chris@47: inline DynamicStruct::Builder CallContext<DynamicStruct, DynamicStruct>::getResults(
Chris@47:     kj::Maybe<MessageSize> sizeHint) {
Chris@47:   return hook->getResults(sizeHint).getAs<DynamicStruct>(resultType);
Chris@47: }
Chris@47: inline DynamicStruct::Builder CallContext<DynamicStruct, DynamicStruct>::initResults(
Chris@47:     kj::Maybe<MessageSize> sizeHint) {
Chris@47:   return hook->getResults(sizeHint).initAs<DynamicStruct>(resultType);
Chris@47: }
Chris@47: inline void CallContext<DynamicStruct, DynamicStruct>::setResults(DynamicStruct::Reader value) {
Chris@47:   hook->getResults(value.totalSize()).setAs<DynamicStruct>(value);
Chris@47: }
Chris@47: inline void CallContext<DynamicStruct, DynamicStruct>::adoptResults(Orphan<DynamicStruct>&& value) {
Chris@47:   hook->getResults(MessageSize { 0, 0 }).adopt(kj::mv(value));
Chris@47: }
Chris@47: inline Orphanage CallContext<DynamicStruct, DynamicStruct>::getResultsOrphanage(
Chris@47:     kj::Maybe<MessageSize> sizeHint) {
Chris@47:   return Orphanage::getForMessageContaining(hook->getResults(sizeHint));
Chris@47: }
Chris@47: template <typename SubParams>
Chris@47: inline kj::Promise<void> CallContext<DynamicStruct, DynamicStruct>::tailCall(
Chris@47:     Request<SubParams, DynamicStruct>&& tailRequest) {
Chris@47:   return hook->tailCall(kj::mv(tailRequest.hook));
Chris@47: }
Chris@47: inline void CallContext<DynamicStruct, DynamicStruct>::allowCancellation() {
Chris@47:   hook->allowCancellation();
Chris@47: }
Chris@47: 
Chris@47: template <>
Chris@47: inline DynamicCapability::Client Capability::Client::castAs<DynamicCapability>(
Chris@47:     InterfaceSchema schema) {
Chris@47:   return DynamicCapability::Client(schema, hook->addRef());
Chris@47: }
Chris@47: 
Chris@47: // -------------------------------------------------------------------
Chris@47: 
Chris@47: template <typename T>
Chris@47: ReaderFor<T> ConstSchema::as() const {
Chris@47:   return DynamicValue::Reader(*this).as<T>();
Chris@47: }
Chris@47: 
Chris@47: }  // namespace capnp
Chris@47: 
Chris@47: #endif  // CAPNP_DYNAMIC_H_