comparison DEPENDENCIES/generic/include/boost/proto/transform/make.hpp @ 16:2665513ce2d3

Add boost headers

+///////////////////////////////////////////////////////////////////////////////
+/// \file make.hpp
+/// Contains definition of the make<> transform.
+//
+//  Copyright 2008 Eric Niebler. Distributed under the Boost
+//  Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_PROTO_TRANSFORM_MAKE_HPP_EAN_12_02_2007
+#define BOOST_PROTO_TRANSFORM_MAKE_HPP_EAN_12_02_2007
+
+#include <boost/detail/workaround.hpp>
+#include <boost/preprocessor/repetition/enum.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
+#include <boost/preprocessor/repetition/enum_binary_params.hpp>
+#include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
+#include <boost/preprocessor/repetition/repeat_from_to.hpp>
+#include <boost/preprocessor/facilities/intercept.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/iteration/iterate.hpp>
+#include <boost/preprocessor/selection/max.hpp>
+#include <boost/preprocessor/arithmetic/inc.hpp>
+#include <boost/mpl/and.hpp>
+#include <boost/mpl/aux_/has_type.hpp>
+#include <boost/proto/detail/template_arity.hpp>
+#include <boost/utility/result_of.hpp>
+#include <boost/proto/proto_fwd.hpp>
+#include <boost/proto/traits.hpp>
+#include <boost/proto/args.hpp>
+#include <boost/proto/transform/impl.hpp>
+#include <boost/proto/transform/detail/pack.hpp>
+#include <boost/proto/detail/as_lvalue.hpp>
+#include <boost/proto/detail/ignore_unused.hpp>
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma warning(push)
+# pragma warning(disable : 4714) // function 'xxx' marked as __forceinline not inlined
+#endif
+
+namespace boost { namespace proto
+{
+    namespace detail
+    {
+        template<typename T>
+        struct is_applyable
+          : mpl::and_<is_callable<T>, is_transform<T> >
+        {};
+
+        template<typename T, bool HasType = mpl::aux::has_type<T>::value>
+        struct nested_type
+        {
+            typedef typename T::type type;
+        };
+
+        template<typename T>
+        struct nested_type<T, false>
+        {
+            typedef T type;
+        };
+
+        template<typename T, bool Applied>
+        struct nested_type_if
+        {
+            typedef T type;
+            static bool const applied = false;
+        };
+
+        template<typename T>
+        struct nested_type_if<T, true>
+          : nested_type<T>
+        {
+            static bool const applied = true;
+        };
+
+        template<
+            typename R
+          , typename Expr, typename State, typename Data
+            BOOST_PROTO_TEMPLATE_ARITY_PARAM(long Arity = detail::template_arity<R>::value)
+        >
+        struct make_
+        {
+            typedef R type;
+            static bool const applied = false;
+        };
+
+        template<
+            typename R
+          , typename Expr, typename State, typename Data
+          , bool IsApplyable = is_applyable<R>::value
+        >
+        struct make_if_
+          : make_<R, Expr, State, Data>
+        {};
+
+        template<typename R, typename Expr, typename State, typename Data>
+        struct make_if_<R, Expr, State, Data, true>
+          : uncvref<typename when<_, R>::template impl<Expr, State, Data>::result_type>
+        {
+            static bool const applied = true;
+        };
+
+        #if BOOST_WORKAROUND(__GNUC__, == 3) || (BOOST_WORKAROUND(__GNUC__, == 4) && __GNUC_MINOR__ == 0)
+        // work around GCC bug
+        template<typename Tag, typename Args, long N, typename Expr, typename State, typename Data>
+        struct make_if_<proto::expr<Tag, Args, N>, Expr, State, Data, false>
+        {
+            typedef proto::expr<Tag, Args, N> type;
+            static bool const applied = false;
+        };
+
+        // work around GCC bug
+        template<typename Tag, typename Args, long N, typename Expr, typename State, typename Data>
+        struct make_if_<proto::basic_expr<Tag, Args, N>, Expr, State, Data, false>
+        {
+            typedef proto::basic_expr<Tag, Args, N> type;
+            static bool const applied = false;
+        };
+        #endif
+
+        template<typename Type, bool IsAggregate = detail::is_aggregate_<Type>::value>
+        struct construct_
+        {
+            typedef Type result_type;
+
+            BOOST_FORCEINLINE
+            Type operator ()() const
+            {
+                return Type();
+            }
+
+            // Other overloads generated by the preprocessor
+            #include <boost/proto/transform/detail/construct_funop.hpp>
+        };
+
+        template<typename Type>
+        struct construct_<Type, true>
+        {
+            typedef Type result_type;
+
+            BOOST_FORCEINLINE
+            Type operator ()() const
+            {
+                return Type();
+            }
+
+            // Other overloads generated by the preprocessor
+            #include <boost/proto/transform/detail/construct_pod_funop.hpp>
+        };
+
+    }
+
+    /// \brief A PrimitiveTransform which prevents another PrimitiveTransform
+    /// from being applied in an \c ObjectTransform.
+    ///
+    /// When building higher order transforms with <tt>make\<\></tt> or
+    /// <tt>lazy\<\></tt>, you sometimes would like to build types that
+    /// are parameterized with Proto transforms. In such lambda-style
+    /// transforms, Proto will unhelpfully find all nested transforms
+    /// and apply them, even if you don't want them to be applied. Consider
+    /// the following transform, which will replace the \c _ in
+    /// <tt>Bar<_>()</tt> with <tt>proto::terminal\<int\>::type</tt>:
+    ///
+    /// \code
+    /// template<typename T>
+    /// struct Bar
+    /// {};
+    /// 
+    /// struct Foo
+    ///   : proto::when<_, Bar<_>() >
+    /// {};
+    /// 
+    /// proto::terminal<int>::type i = {0};
+    /// 
+    /// int main()
+    /// {
+    ///     Foo()(i);
+    ///     std::cout << typeid(Foo()(i)).name() << std::endl;
+    /// }
+    /// \endcode
+    ///
+    /// If you actually wanted to default-construct an object of type
+    /// <tt>Bar\<_\></tt>, you would have to protect the \c _ to prevent
+    /// it from being applied. You can use <tt>proto::protect\<\></tt>
+    /// as follows:
+    ///
+    /// \code
+    /// // OK: replace anything with Bar<_>()
+    /// struct Foo
+    ///   : proto::when<_, Bar<protect<_> >() >
+    /// {};
+    /// \endcode
+    template<typename PrimitiveTransform>
+    struct protect : transform<protect<PrimitiveTransform> >
+    {
+        template<typename, typename, typename>
+        struct impl
+        {
+            typedef PrimitiveTransform result_type;
+        };
+    };
+
+    /// \brief A PrimitiveTransform which computes a type by evaluating any
+    /// nested transforms and then constructs an object of that type.
+    ///
+    /// The <tt>make\<\></tt> transform checks to see if \c Object is a template.
+    /// If it is, the template type is disassembled to find nested transforms.
+    /// Proto considers the following types to represent transforms:
+    ///
+    /// \li Function types
+    /// \li Function pointer types
+    /// \li Types for which <tt>proto::is_callable\< type \>::value</tt> is \c true
+    ///
+    /// <tt>boost::result_of\<make\<T\<X0,X1,...\> \>(Expr, State, Data)\>::type</tt>
+    /// is evaluated as follows. For each \c X in <tt>X0,X1,...</tt>, do:
+    ///
+    /// \li If \c X is a template like <tt>U\<Y0,Y1,...\></tt>, then let <tt>X'</tt>
+    ///     be <tt>boost::result_of\<make\<U\<Y0,Y1,...\> \>(Expr, State, Data)\>::type</tt>
+    ///     (which evaluates this procedure recursively). Note whether any
+    ///     substitutions took place during this operation.
+    /// \li Otherwise, if \c X is a transform, then let <tt>X'</tt> be
+    ///     <tt>boost::result_of\<when\<_, X\>(Expr, State, Data)\>::type</tt>.
+    ///     Note that a substitution took place.
+    /// \li Otherwise, let <tt>X'</tt> be \c X, and note that no substitution
+    ///     took place.
+    /// \li If any substitutions took place in any of the above steps and
+    ///     <tt>T\<X0',X1',...\></tt> has a nested <tt>::type</tt> typedef,
+    ///     the result type is <tt>T\<X0',X1',...\>::type</tt>.
+    /// \li Otherwise, the result type is <tt>T\<X0',X1',...\></tt>.
+    ///
+    /// Note that <tt>when\<\></tt> is implemented in terms of <tt>call\<\></tt>
+    /// and <tt>make\<\></tt>, so the above procedure is evaluated recursively.
+    template<typename Object>
+    struct make : transform<make<Object> >
+    {
+        template<typename Expr, typename State, typename Data>
+        struct impl : transform_impl<Expr, State, Data>
+        {
+            typedef typename detail::make_if_<Object, Expr, State, Data>::type result_type;
+
+            /// \return <tt>result_type()</tt>
+            BOOST_FORCEINLINE
+            result_type operator ()(
+                typename impl::expr_param
+              , typename impl::state_param
+              , typename impl::data_param
+            ) const
+            {
+                return result_type();
+            }
+        };
+    };
+
+    /// INTERNAL ONLY
+    template<typename Fun>
+    struct make<detail::msvc_fun_workaround<Fun> >
+      : make<Fun>
+    {};
+
+    // Other specializations generated by the preprocessor.
+    #include <boost/proto/transform/detail/make.hpp>
+    #include <boost/proto/transform/detail/make_gcc_workaround.hpp>
+
+    /// INTERNAL ONLY
+    ///
+    template<typename Object>
+    struct is_callable<make<Object> >
+      : mpl::true_
+    {};
+
+    /// INTERNAL ONLY
+    ///
+    template<typename PrimitiveTransform>
+    struct is_callable<protect<PrimitiveTransform> >
+      : mpl::true_
+    {};
+
+}}
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma warning(pop)
+#endif
+
+#endif