Added boost header

test/external/boost/proto/deep_copy.hpp

@@ -0,0 +1,163 @@
+///////////////////////////////////////////////////////////////////////////////
+/// \file deep_copy.hpp
+/// Replace all nodes stored by reference by nodes stored by value.
+//
+//  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_DEEP_COPY_HPP_EAN_11_21_2006
+#define BOOST_PROTO_DEEP_COPY_HPP_EAN_11_21_2006
+
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/repetition/enum.hpp>
+#include <boost/preprocessor/iteration/iterate.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/proto/proto_fwd.hpp>
+#include <boost/proto/args.hpp>
+#include <boost/proto/expr.hpp>
+
+namespace boost { namespace proto
+{
+    namespace detail
+    {
+        template<typename Expr, long Arity = Expr::proto_arity_c>
+        struct deep_copy_impl;
+
+        template<typename Expr>
+        struct deep_copy_impl<Expr, 0>
+        {
+            typedef
+                typename base_expr<
+                    typename Expr::proto_domain
+                  , tag::terminal
+                  , term<typename term_traits<typename Expr::proto_child0>::value_type>
+                >::type
+            expr_type;
+
+            typedef typename Expr::proto_generator proto_generator;
+            typedef typename proto_generator::template result<proto_generator(expr_type)>::type result_type;
+
+            template<typename Expr2, typename S, typename D>
+            result_type operator()(Expr2 const &e, S const &, D const &) const
+            {
+                return proto_generator()(expr_type::make(e.proto_base().child0));
+            }
+        };
+    }
+
+    namespace result_of
+    {
+        /// \brief A metafunction for calculating the return type
+        /// of \c proto::deep_copy().
+        ///
+        /// A metafunction for calculating the return type
+        /// of \c proto::deep_copy(). The type parameter \c Expr
+        /// should be the type of a Proto expression tree.
+        /// It should not be a reference type, nor should it
+        /// be cv-qualified.
+        template<typename Expr>
+        struct deep_copy
+        {
+            typedef
+                typename detail::deep_copy_impl<
+                    BOOST_PROTO_UNCVREF(Expr)
+                >::result_type
+            type;
+        };
+    }
+
+    namespace functional
+    {
+        /// \brief A PolymorphicFunctionObject type for deep-copying
+        /// Proto expression trees.
+        ///
+        /// A PolymorphicFunctionObject type for deep-copying
+        /// Proto expression trees. When a tree is deep-copied,
+        /// all internal nodes and most terminals held by reference
+        /// are instead held by value.
+        ///
+        /// \attention Terminals of reference-to-function type are
+        /// left unchanged. Terminals of reference-to-array type are
+        /// stored by value, which can cause a large amount of data
+        /// to be passed by value and stored on the stack.
+        struct deep_copy
+        {
+            BOOST_PROTO_CALLABLE()
+
+            template<typename Sig>
+            struct result;
+
+            template<typename This, typename Expr>
+            struct result<This(Expr)>
+            {
+                typedef
+                    typename detail::deep_copy_impl<
+                        BOOST_PROTO_UNCVREF(Expr)
+                    >::result_type
+                type;
+            };
+
+            /// \brief Deep-copies a Proto expression tree, turning all
+            /// nodes and terminals held by reference into ones held by
+            /// value.
+            template<typename Expr>
+            typename result_of::deep_copy<Expr>::type
+            operator()(Expr const &e) const
+            {
+                return proto::detail::deep_copy_impl<Expr>()(e, 0, 0);
+            }
+        };
+    }
+
+    /// \brief A function for deep-copying
+    /// Proto expression trees.
+    ///
+    /// A function for deep-copying
+    /// Proto expression trees. When a tree is deep-copied,
+    /// all internal nodes and most terminals held by reference
+    /// are instead held by value.
+    ///
+    /// \attention Terminals of reference-to-function type are
+    /// left unchanged.
+    ///
+    /// \sa proto::functional::deep_copy.
+    template<typename Expr>
+    typename proto::result_of::deep_copy<Expr>::type
+    deep_copy(Expr const &e)
+    {
+        return proto::detail::deep_copy_impl<Expr>()(e, 0, 0);
+    }
+
+    /// \brief A PrimitiveTransform for deep-copying
+    /// Proto expression trees.
+    ///
+    /// A PrimitiveTransform for deep-copying
+    /// Proto expression trees. When a tree is deep-copied,
+    /// all internal nodes and most terminals held by reference
+    /// are instead held by value.
+    ///
+    /// \attention Terminals of reference-to-function type are
+    /// left unchanged.
+    ///
+    /// \sa proto::functional::deep_copy.
+    struct _deep_copy
+      : proto::transform<_deep_copy>
+    {
+        template<typename E, typename S, typename D>
+        struct impl
+          : detail::deep_copy_impl<BOOST_PROTO_UNCVREF(E)>
+        {};
+    };
+
+    namespace detail
+    {
+        // include the definition of deep_copy_impl
+        #include <boost/proto/detail/deep_copy.hpp>
+    }
+
+}}
+
+#endif // BOOST_PROTO_COMPILER_DEEP_COPY_HPP_EAN_11_21_2006
+