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1 | // Copyright (C) 2007, 2008 Steven Watanabe, Joseph Gauterin, Niels Dekker |
2 | // | |
3 | // Distributed under the Boost Software License, Version 1.0. (See | |
4 | // accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | // For more information, see http://www.boost.org | |
7 | ||
8 | ||
9 | #ifndef BOOST_CORE_SWAP_HPP | |
10 | #define BOOST_CORE_SWAP_HPP | |
11 | ||
12 | // Note: the implementation of this utility contains various workarounds: | |
13 | // - swap_impl is put outside the boost namespace, to avoid infinite | |
14 | // recursion (causing stack overflow) when swapping objects of a primitive | |
15 | // type. | |
16 | // - swap_impl has a using-directive, rather than a using-declaration, | |
17 | // because some compilers (including MSVC 7.1, Borland 5.9.3, and | |
18 | // Intel 8.1) don't do argument-dependent lookup when it has a | |
19 | // using-declaration instead. | |
20 | // - boost::swap has two template arguments, instead of one, to | |
21 | // avoid ambiguity when swapping objects of a Boost type that does | |
22 | // not have its own boost::swap overload. | |
23 | ||
24 | #include <utility> //for std::swap (C++11) | |
25 | #include <algorithm> //for std::swap (C++98) | |
26 | #include <cstddef> //for std::size_t | |
27 | #include <boost/config.hpp> | |
28 | ||
29 | namespace boost_swap_impl | |
30 | { | |
31 | template<class T> | |
32 | BOOST_GPU_ENABLED | |
33 | void swap_impl(T& left, T& right) | |
34 | { | |
35 | using namespace std;//use std::swap if argument dependent lookup fails | |
36 | swap(left,right); | |
37 | } | |
38 | ||
39 | template<class T, std::size_t N> | |
40 | BOOST_GPU_ENABLED | |
41 | void swap_impl(T (& left)[N], T (& right)[N]) | |
42 | { | |
43 | for (std::size_t i = 0; i < N; ++i) | |
44 | { | |
45 | ::boost_swap_impl::swap_impl(left[i], right[i]); | |
46 | } | |
47 | } | |
48 | } | |
49 | ||
50 | namespace boost | |
51 | { | |
52 | template<class T1, class T2> | |
53 | BOOST_GPU_ENABLED | |
54 | void swap(T1& left, T2& right) | |
55 | { | |
56 | ::boost_swap_impl::swap_impl(left, right); | |
57 | } | |
58 | } | |
59 | ||
60 | #endif |