projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | // Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal. |
| 2 | // Copyright (C) 2015 Andrzej Krzemienski. | |
| 3 | // | |
| 4 | // Use, modification, and distribution is subject to the Boost Software | |
| 5 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
| 6 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 7 | // | |
| 8 | // See http://www.boost.org/libs/optional for documentation. | |
| 9 | // | |
| 10 | // You are welcome to contact the author at: | |
| 11 | // akrzemi1@gmail.com | |
| 12 | ||
| 13 | #ifndef BOOST_OPTIONAL_DETAIL_OPTIONAL_SWAP_AJK_28JAN2015_HPP | |
| 14 | #define BOOST_OPTIONAL_DETAIL_OPTIONAL_SWAP_AJK_28JAN2015_HPP | |
| 15 | ||
| 16 | #include <boost/core/swap.hpp> | |
| 17 | #include <boost/optional/optional_fwd.hpp> | |
| 18 | ||
| 19 | namespace boost { | |
| 20 | ||
| 21 | namespace optional_detail { | |
| 22 | ||
| 23 | template <bool use_default_constructor> struct swap_selector; | |
| 24 | ||
| 25 | template <> | |
| 26 | struct swap_selector<true> | |
| 27 | { | |
| 28 | template <class T> | |
| 29 | static void optional_swap ( optional<T>& x, optional<T>& y ) | |
| 30 | { | |
| 31 | const bool hasX = !!x; | |
| 32 | const bool hasY = !!y; | |
| 33 | ||
| 34 | if ( !hasX && !hasY ) | |
| 35 | return; | |
| 36 | ||
| 37 | if( !hasX ) | |
| 38 | x.emplace(); | |
| 39 | else if ( !hasY ) | |
| 40 | y.emplace(); | |
| 41 | ||
| 42 | // Boost.Utility.Swap will take care of ADL and workarounds for broken compilers | |
| 43 | boost::swap(x.get(), y.get()); | |
| 44 | ||
| 45 | if( !hasX ) | |
| 46 | y = boost::none ; | |
| 47 | else if( !hasY ) | |
| 48 | x = boost::none ; | |
| 49 | } | |
| 50 | }; | |
| 51 | ||
| 52 | #ifdef BOOST_OPTIONAL_DETAIL_MOVE | |
| 53 | # undef BOOST_OPTIONAL_DETAIL_MOVE | |
| 54 | #endif | |
| 55 | ||
| 56 | #ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES | |
| 57 | # define BOOST_OPTIONAL_DETAIL_MOVE(EXPR_) boost::move(EXPR_) | |
| 58 | #else | |
| 59 | # define BOOST_OPTIONAL_DETAIL_MOVE(EXPR_) EXPR_ | |
| 60 | #endif | |
| 61 | ||
| 62 | template <> | |
| 63 | struct swap_selector<false> | |
| 64 | { | |
| 65 | template <class T> | |
| 66 | static void optional_swap ( optional<T>& x, optional<T>& y ) | |
| 67 | //BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value && BOOST_NOEXCEPT_EXPR(boost::swap(*x, *y))) | |
| 68 | { | |
| 69 | if (x) | |
| 70 | { | |
| 71 | if (y) | |
| 72 | { | |
| 73 | boost::swap(*x, *y); | |
| 74 | } | |
| 75 | else | |
| 76 | { | |
| 77 | y = BOOST_OPTIONAL_DETAIL_MOVE(*x); | |
| 78 | x = boost::none; | |
| 79 | } | |
| 80 | } | |
| 81 | else | |
| 82 | { | |
| 83 | if (y) | |
| 84 | { | |
| 85 | x = BOOST_OPTIONAL_DETAIL_MOVE(*y); | |
| 86 | y = boost::none; | |
| 87 | } | |
| 88 | } | |
| 89 | } | |
| 90 | }; | |
| 91 | ||
| 92 | } // namespace optional_detail | |
| 93 | ||
| 94 | #if (!defined BOOST_NO_CXX11_RVALUE_REFERENCES) && (!defined BOOST_CONFIG_RESTORE_OBSOLETE_SWAP_IMPLEMENTATION) | |
| 95 | ||
| 96 | template<class T> | |
| 97 | struct optional_swap_should_use_default_constructor : boost::false_type {} ; | |
| 98 | ||
| 99 | #else | |
| 100 | ||
| 101 | template<class T> | |
| 102 | struct optional_swap_should_use_default_constructor : has_nothrow_default_constructor<T> {} ; | |
| 103 | ||
| 104 | #endif | |
| 105 | ||
| 106 | template <class T> | |
| 107 | inline void swap ( optional<T>& x, optional<T>& y ) | |
| 108 | //BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value && BOOST_NOEXCEPT_EXPR(boost::swap(*x, *y))) | |
| 109 | { | |
| 110 | optional_detail::swap_selector<optional_swap_should_use_default_constructor<T>::value>::optional_swap(x, y); | |
| 111 | } | |
| 112 | ||
| 113 | } // namespace boost | |
| 114 | ||
| 115 | #undef BOOST_OPTIONAL_DETAIL_MOVE | |
| 116 | ||
| 117 | #endif // header guard |