projects / ceph.git / blame
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|---|---|---|
| 7c673cae FG |
1 | /* Copyright 2003-2014 Joaquin M Lopez Munoz. |
| 2 | * Distributed under the Boost Software License, Version 1.0. | |
| 3 | * (See accompanying file LICENSE_1_0.txt or copy at | |
| 4 | * http://www.boost.org/LICENSE_1_0.txt) | |
| 5 | * | |
| 6 | * See http://www.boost.org/libs/multi_index for library home page. | |
| 7 | */ | |
| 8 | ||
| 9 | #ifndef BOOST_MULTI_INDEX_DETAIL_PROMOTES_ARG_HPP | |
| 10 | #define BOOST_MULTI_INDEX_DETAIL_PROMOTES_ARG_HPP | |
| 11 | ||
| 12 | #if defined(_MSC_VER) | |
| 13 | #pragma once | |
| 14 | #endif | |
| 15 | ||
| 16 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ | |
| 17 | #include <boost/mpl/bool.hpp> | |
| 18 | #include <boost/type_traits/intrinsics.hpp> | |
| 19 | ||
| 20 | /* Metafunctions to check if f(arg1,arg2) promotes either arg1 to the type of | |
| 21 | * arg2 or viceversa. By default, (i.e. if it cannot be determined), no | |
| 22 | * promotion is assumed. | |
| 23 | */ | |
| 24 | ||
| 25 | #if !defined(BOOST_IS_CONVERTIBLE) | |
| 26 | ||
| 27 | namespace boost{ | |
| 28 | ||
| 29 | namespace multi_index{ | |
| 30 | ||
| 31 | namespace detail{ | |
| 32 | ||
| 33 | template<typename F,typename Arg1,typename Arg2> | |
| 34 | struct promotes_1st_arg:mpl::false_{}; | |
| 35 | ||
| 36 | template<typename F,typename Arg1,typename Arg2> | |
| 37 | struct promotes_2nd_arg:mpl::false_{}; | |
| 38 | ||
| 39 | } /* namespace multi_index::detail */ | |
| 40 | ||
| 41 | } /* namespace multi_index */ | |
| 42 | ||
| 43 | } /* namespace boost */ | |
| 44 | ||
| 45 | #else | |
| 46 | ||
| 47 | #include <boost/mpl/and.hpp> | |
| 48 | #include <boost/mpl/not.hpp> | |
| 49 | #include <boost/multi_index/detail/is_transparent.hpp> | |
| 50 | #include <boost/type_traits/is_convertible.hpp> | |
| 51 | ||
| 52 | namespace boost{ | |
| 53 | ||
| 54 | namespace multi_index{ | |
| 55 | ||
| 56 | namespace detail{ | |
| 57 | ||
| 58 | template<typename F,typename Arg1,typename Arg2> | |
| 59 | struct promotes_1st_arg: | |
| 60 | mpl::and_< | |
| 61 | mpl::not_<is_transparent<F,Arg1,Arg2> >, | |
| 62 | is_convertible<const Arg1,Arg2>, | |
| 63 | is_transparent<F,Arg2,Arg2> | |
| 64 | > | |
| 65 | {}; | |
| 66 | ||
| 67 | template<typename F,typename Arg1,typename Arg2> | |
| 68 | struct promotes_2nd_arg: | |
| 69 | mpl::and_< | |
| 70 | mpl::not_<is_transparent<F,Arg1,Arg2> >, | |
| 71 | is_convertible<const Arg2,Arg1>, | |
| 72 | is_transparent<F,Arg1,Arg1> | |
| 73 | > | |
| 74 | {}; | |
| 75 | ||
| 76 | } /* namespace multi_index::detail */ | |
| 77 | ||
| 78 | } /* namespace multi_index */ | |
| 79 | ||
| 80 | } /* namespace boost */ | |
| 81 | ||
| 82 | #endif /* defined(BOOST_IS_CONVERTIBLE) */ | |
| 83 | #endif |