Chris@16: // Copyright (C) 2007, 2008 Steven Watanabe, Joseph Gauterin, Niels Dekker
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: // For more information, see http://www.boost.org
Chris@16: 
Chris@16: 
Chris@16: #ifndef BOOST_UTILITY_SWAP_HPP
Chris@16: #define BOOST_UTILITY_SWAP_HPP
Chris@16: 
Chris@16: // Note: the implementation of this utility contains various workarounds:
Chris@16: // - swap_impl is put outside the boost namespace, to avoid infinite
Chris@16: // recursion (causing stack overflow) when swapping objects of a primitive
Chris@16: // type.
Chris@16: // - swap_impl has a using-directive, rather than a using-declaration,
Chris@16: // because some compilers (including MSVC 7.1, Borland 5.9.3, and
Chris@16: // Intel 8.1) don't do argument-dependent lookup when it has a
Chris@16: // using-declaration instead.
Chris@16: // - boost::swap has two template arguments, instead of one, to
Chris@16: // avoid ambiguity when swapping objects of a Boost type that does
Chris@16: // not have its own boost::swap overload.
Chris@16: 
Chris@16: #include <algorithm> //for std::swap
Chris@16: #include <cstddef> //for std::size_t
Chris@16: 
Chris@16: namespace boost_swap_impl
Chris@16: {
Chris@16:   template<class T>
Chris@16:   void swap_impl(T& left, T& right)
Chris@16:   {
Chris@16:     using namespace std;//use std::swap if argument dependent lookup fails
Chris@16:     swap(left,right);
Chris@16:   }
Chris@16: 
Chris@16:   template<class T, std::size_t N>
Chris@16:   void swap_impl(T (& left)[N], T (& right)[N])
Chris@16:   {
Chris@16:     for (std::size_t i = 0; i < N; ++i)
Chris@16:     {
Chris@16:       ::boost_swap_impl::swap_impl(left[i], right[i]);
Chris@16:     }
Chris@16:   }
Chris@16: }
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:   template<class T1, class T2>
Chris@16:   void swap(T1& left, T2& right)
Chris@16:   {
Chris@16:     ::boost_swap_impl::swap_impl(left, right);
Chris@16:   }
Chris@16: }
Chris@16: 
Chris@16: #endif