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//////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright 2007, 2008 Steven Watanabe, Joseph Gauterin, Niels Dekker
// (C) Copyright Ion Gaztanaga 2005-2013. 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/container for documentation.
//
//////////////////////////////////////////////////////////////////////////////

#ifndef BOOST_MOVE_ADL_MOVE_SWAP_HPP
#define BOOST_MOVE_ADL_MOVE_SWAP_HPP

#ifndef BOOST_CONFIG_HPP
#  include <boost/config.hpp>
#endif
#
#if defined(BOOST_HAS_PRAGMA_ONCE)
#  pragma once
#endif

//Based on Boost.Core's swap.
//Many thanks to Steven Watanabe, Joseph Gauterin and Niels Dekker.
#include <cstddef> //for std::size_t
#include <boost/move/detail/workaround.hpp>  //forceinline

//Try to avoid including <algorithm>, as it's quite big
#if defined(_MSC_VER) && defined(BOOST_DINKUMWARE_STDLIB)
   #include <utility>   //Dinkum libraries define std::swap in utility which is lighter than algorithm
#elif defined(BOOST_GNU_STDLIB)
   //For non-GCC compilers, where GNUC version is not very reliable, or old GCC versions
   //use the good old stl_algobase header, which is quite lightweight
   #if !defined(BOOST_GCC) || ((__GNUC__ < 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ < 3)))
      #include <bits/stl_algobase.h>
   #elif (__GNUC__ == 4) && (__GNUC_MINOR__ == 3)
      //In GCC 4.3 a tiny stl_move.h was created with swap and move utilities
      #include <bits/stl_move.h>
   #else
      //In GCC 4.4 stl_move.h was renamed to move.h
      #include <bits/move.h>
   #endif
#elif defined(_LIBCPP_VERSION)
   #include <type_traits>  //The initial import of libc++ defines std::swap and still there
#elif __cplusplus >= 201103L
   #include <utility>    //Fallback for C++ >= 2011
#else
   #include <algorithm>  //Fallback for C++98/03
#endif

#include <boost/move/utility_core.hpp> //for boost::move

#if !defined(BOOST_MOVE_DOXYGEN_INVOKED)

#if defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
namespace boost_move_member_swap {

struct dont_care
{
   dont_care(...);
};

struct private_type
{
   static private_type p;
   private_type const &operator,(int) const;
};

typedef char yes_type;            
struct no_type{ char dummy[2]; }; 

template<typename T>
no_type is_private_type(T const &);

yes_type is_private_type(private_type const &);

template <typename Type>
class has_member_function_named_swap
{
   struct BaseMixin
   {
      void swap();
   };

   struct Base : public Type, public BaseMixin { Base(); };
   template <typename T, T t> class Helper{};

   template <typename U>
   static no_type deduce(U*, Helper<void (BaseMixin::*)(), &U::swap>* = 0);
   static yes_type deduce(...);

   public:
   static const bool value = sizeof(yes_type) == sizeof(deduce((Base*)(0)));
};

template<typename Fun, bool HasFunc>
struct has_member_swap_impl
{
   static const bool value = false;
};