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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 | ||
92f5a8d4 TL |
24 | #include <boost/core/enable_if.hpp> |
25 | #include <boost/config.hpp> | |
f67539c2 | 26 | #if __cplusplus >= 201103L || defined(BOOST_MSVC) |
7c673cae | 27 | #include <utility> //for std::swap (C++11) |
f67539c2 | 28 | #else |
7c673cae | 29 | #include <algorithm> //for std::swap (C++98) |
f67539c2 | 30 | #endif |
7c673cae | 31 | #include <cstddef> //for std::size_t |
7c673cae FG |
32 | |
33 | namespace boost_swap_impl | |
34 | { | |
92f5a8d4 TL |
35 | // we can't use type_traits here |
36 | ||
37 | template<class T> struct is_const { enum _vt { value = 0 }; }; | |
38 | template<class T> struct is_const<T const> { enum _vt { value = 1 }; }; | |
39 | ||
7c673cae FG |
40 | template<class T> |
41 | BOOST_GPU_ENABLED | |
42 | void swap_impl(T& left, T& right) | |
43 | { | |
44 | using namespace std;//use std::swap if argument dependent lookup fails | |
45 | swap(left,right); | |
46 | } | |
47 | ||
48 | template<class T, std::size_t N> | |
49 | BOOST_GPU_ENABLED | |
50 | void swap_impl(T (& left)[N], T (& right)[N]) | |
51 | { | |
52 | for (std::size_t i = 0; i < N; ++i) | |
53 | { | |
54 | ::boost_swap_impl::swap_impl(left[i], right[i]); | |
55 | } | |
56 | } | |
57 | } | |
58 | ||
59 | namespace boost | |
60 | { | |
61 | template<class T1, class T2> | |
62 | BOOST_GPU_ENABLED | |
92f5a8d4 TL |
63 | typename enable_if_c< !boost_swap_impl::is_const<T1>::value && !boost_swap_impl::is_const<T2>::value >::type |
64 | swap(T1& left, T2& right) | |
7c673cae FG |
65 | { |
66 | ::boost_swap_impl::swap_impl(left, right); | |
67 | } | |
68 | } | |
69 | ||
70 | #endif |