comparison osx/include/kj/vector.h @ 49:3ab5a40c4e3b

Add Capnp and KJ builds for OSX

+// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
+// Licensed under the MIT License:
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#ifndef KJ_VECTOR_H_
+#define KJ_VECTOR_H_
+
+#if defined(__GNUC__) && !KJ_HEADER_WARNINGS
+#pragma GCC system_header
+#endif
+
+#include "array.h"
+
+namespace kj {
+
+template <typename T>
+class Vector {
+  // Similar to std::vector, but based on KJ framework.
+  //
+  // This implementation always uses move constructors when growing the backing array.  If the
+  // move constructor throws, the Vector is left in an inconsistent state.  This is acceptable
+  // under KJ exception theory which assumes that exceptions leave things in inconsistent states.
+
+  // TODO(someday): Allow specifying a custom allocator.
+
+public:
+  inline Vector() = default;
+  inline explicit Vector(size_t capacity): builder(heapArrayBuilder<T>(capacity)) {}
+
+  inline operator ArrayPtr<T>() { return builder; }
+  inline operator ArrayPtr<const T>() const { return builder; }
+  inline ArrayPtr<T> asPtr() { return builder.asPtr(); }
+  inline ArrayPtr<const T> asPtr() const { return builder.asPtr(); }
+
+  inline size_t size() const { return builder.size(); }
+  inline bool empty() const { return size() == 0; }
+  inline size_t capacity() const { return builder.capacity(); }
+  inline T& operator[](size_t index) const { return builder[index]; }
+
+  inline const T* begin() const { return builder.begin(); }
+  inline const T* end() const { return builder.end(); }
+  inline const T& front() const { return builder.front(); }
+  inline const T& back() const { return builder.back(); }
+  inline T* begin() { return builder.begin(); }
+  inline T* end() { return builder.end(); }
+  inline T& front() { return builder.front(); }
+  inline T& back() { return builder.back(); }
+
+  inline Array<T> releaseAsArray() {
+    // TODO(perf):  Avoid a copy/move by allowing Array<T> to point to incomplete space?
+    if (!builder.isFull()) {
+      setCapacity(size());
+    }
+    return builder.finish();
+  }
+
+  template <typename... Params>
+  inline T& add(Params&&... params) {
+    if (builder.isFull()) grow();
+    return builder.add(kj::fwd<Params>(params)...);
+  }
+
+  template <typename Iterator>
+  inline void addAll(Iterator begin, Iterator end) {
+    size_t needed = builder.size() + (end - begin);
+    if (needed > builder.capacity()) grow(needed);
+    builder.addAll(begin, end);
+  }
+
+  template <typename Container>
+  inline void addAll(Container&& container) {
+    addAll(container.begin(), container.end());
+  }
+
+  inline void removeLast() {
+    builder.removeLast();
+  }
+
+  inline void resize(size_t size) {
+    if (size > builder.capacity()) grow(size);
+    while (builder.size() < size) {
+      builder.add(T());
+    }
+    while (builder.size() > size) {
+      builder.removeLast();
+    }
+  }
+
+  inline void operator=(decltype(nullptr)) {
+    builder = nullptr;
+  }
+
+  inline void clear() {
+    while (builder.size() > 0) {
+      builder.removeLast();
+    }
+  }
+
+  inline void truncate(size_t size) {
+    while (builder.size() > size) {
+      builder.removeLast();
+    }
+  }
+
+private:
+  ArrayBuilder<T> builder;
+
+  void grow(size_t minCapacity = 0) {
+    setCapacity(kj::max(minCapacity, capacity() == 0 ? 4 : capacity() * 2));
+  }
+  void setCapacity(size_t newSize) {
+    ArrayBuilder<T> newBuilder = heapArrayBuilder<T>(newSize);
+    size_t moveCount = kj::min(newSize, builder.size());
+    for (size_t i = 0; i < moveCount; i++) {
+      newBuilder.add(kj::mv(builder[i]));
+    }
+    builder = kj::mv(newBuilder);
+  }
+};
+
+template <typename T>
+inline auto KJ_STRINGIFY(const Vector<T>& v) -> decltype(toCharSequence(v.asPtr())) {
+  return toCharSequence(v.asPtr());
+}
+
+}  // namespace kj
+
+#endif  // KJ_VECTOR_H_