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