comparison DEPENDENCIES/generic/include/boost/move/utility.hpp @ 16:2665513ce2d3

Add boost headers

+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2012-2012.
+// 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)
+//
+// See http://www.boost.org/libs/move for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+//! \file
+
+#ifndef BOOST_MOVE_MOVE_UTILITY_HPP
+#define BOOST_MOVE_MOVE_UTILITY_HPP
+
+#include <boost/move/detail/config_begin.hpp>
+#include <boost/move/core.hpp>
+#include <boost/move/detail/meta_utils.hpp>
+
+#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_MOVE_DOXYGEN_INVOKED)
+
+   namespace boost {
+
+   template<class T>
+   struct enable_move_utility_emulation
+   {
+      static const bool value = true;
+   };
+    
+   //////////////////////////////////////////////////////////////////////////////
+   //
+   //                            move()
+   //
+   //////////////////////////////////////////////////////////////////////////////
+
+   template <class T>
+   inline typename ::boost::move_detail::enable_if_c
+      < enable_move_utility_emulation<T>::value && !has_move_emulation_enabled<T>::value, T&>::type
+         move(T& x) BOOST_NOEXCEPT
+   {
+      return x;
+   }
+
+   template <class T>
+   inline typename ::boost::move_detail::enable_if_c
+      < enable_move_utility_emulation<T>::value && has_move_emulation_enabled<T>::value, rv<T>&>::type
+         move(T& x) BOOST_NOEXCEPT
+   {
+      return *static_cast<rv<T>* >(::boost::move_detail::addressof(x));
+   }
+
+   template <class T>
+   inline typename ::boost::move_detail::enable_if_c
+      < enable_move_utility_emulation<T>::value && has_move_emulation_enabled<T>::value, rv<T>&>::type
+         move(rv<T>& x) BOOST_NOEXCEPT
+   {
+      return x;
+   }
+
+   //////////////////////////////////////////////////////////////////////////////
+   //
+   //                            forward()
+   //
+   //////////////////////////////////////////////////////////////////////////////
+
+   template <class T>
+   inline typename ::boost::move_detail::enable_if_c
+      < enable_move_utility_emulation<T>::value && ::boost::move_detail::is_rv<T>::value, T &>::type
+         forward(const typename ::boost::move_detail::identity<T>::type &x) BOOST_NOEXCEPT
+   {
+      return const_cast<T&>(x);
+   }
+
+   template <class T>
+   inline typename ::boost::move_detail::enable_if_c
+      < enable_move_utility_emulation<T>::value && !::boost::move_detail::is_rv<T>::value, const T &>::type
+      forward(const typename ::boost::move_detail::identity<T>::type &x) BOOST_NOEXCEPT
+   {
+      return x;
+   }
+
+   }  //namespace boost
+
+#else    //#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_MOVE_DOXYGEN_INVOKED)
+
+   #if defined(BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE)
+      #include <utility>
+
+      namespace boost{
+
+      using ::std::move;
+      using ::std::forward;
+
+      }  //namespace boost
+
+   #else //!BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE
+
+      #include <boost/type_traits/remove_reference.hpp>
+
+      namespace boost {
+
+      //! This trait's internal boolean `value` is false in compilers with rvalue references
+      //! and true in compilers without rvalue references.
+      //!
+      //! A user can specialize this trait for a type T to false to SFINAE out `move` and `forward`
+      //! so that the user can define a different move emulation for that type in namespace boost
+      //! (e.g. another Boost library for its types) and avoid any overload ambiguity.
+      template<class T>
+      struct enable_move_utility_emulation
+      {
+         static const bool value = false;
+      };
+
+      //////////////////////////////////////////////////////////////////////////////
+      //
+      //                                  move
+      //
+      //////////////////////////////////////////////////////////////////////////////
+
+      #if defined(BOOST_MOVE_DOXYGEN_INVOKED)
+         //! This function provides a way to convert a reference into a rvalue reference
+         //! in compilers with rvalue references. For other compilers converts T & into
+         //! <i>::boost::rv<T> &</i> so that move emulation is activated.
+         template <class T>
+         rvalue_reference move(input_reference) noexcept;
+
+      #elif defined(BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES)
+
+         //Old move approach, lvalues could bind to rvalue references
+         template <class T>
+         inline typename remove_reference<T>::type && move(T&& t) BOOST_NOEXCEPT
+         {  return t;   }
+
+      #else //BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES
+
+         template <class T>
+         inline typename remove_reference<T>::type && move(T&& t) BOOST_NOEXCEPT
+         { return static_cast<typename remove_reference<T>::type &&>(t); }
+
+      #endif   //BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES
+
+      //////////////////////////////////////////////////////////////////////////////
+      //
+      //                                  forward
+      //
+      //////////////////////////////////////////////////////////////////////////////
+
+
+      #if defined(BOOST_MOVE_DOXYGEN_INVOKED)
+         //! This function provides limited form of forwarding that is usually enough for
+         //! in-place construction and avoids the exponential overloading for
+         //! achieve the limited forwarding in C++03.
+         //!
+         //! For compilers with rvalue references this function provides perfect forwarding.
+         //!
+         //! Otherwise:
+         //! * If input_reference binds to const ::boost::rv<T> & then it output_reference is
+         //!   ::boost::rv<T> &
+         //!
+         //! * Else, output_reference is equal to input_reference.
+         template <class T> output_reference forward(input_reference) noexcept;
+      #elif defined(BOOST_MOVE_OLD_RVALUE_REF_BINDING_RULES)
+
+         //Old move approach, lvalues could bind to rvalue references
+
+         template <class T>
+         inline T&& forward(typename ::boost::move_detail::identity<T>::type&& t) BOOST_NOEXCEPT
+         {  return t;   }
+
+      #else //Old move
+
+         //Implementation #5 from N2951, thanks to Howard Hinnant
+
+         template <class T, class U>
+         inline T&& forward(U&& t
+             , typename ::boost::move_detail::enable_if_c<
+               move_detail::is_lvalue_reference<T>::value ? move_detail::is_lvalue_reference<U>::value : true>::type * = 0/*
+             , typename ::boost::move_detail::enable_if_c<
+               move_detail::is_convertible
+                  <typename remove_reference<U>::type*, typename remove_reference<T>::type*>::value>::type * = 0*/) BOOST_NOEXCEPT
+         { return static_cast<T&&>(t);   }
+
+      #endif   //BOOST_MOVE_DOXYGEN_INVOKED
+
+      }  //namespace boost {
+
+   #endif   //#if defined(BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE)
+
+#endif   //BOOST_NO_CXX11_RVALUE_REFERENCES
+
+#include <boost/move/detail/config_end.hpp>
+
+#endif //#ifndef BOOST_MOVE_MOVE_UTILITY_HPP