projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*============================================================================= |
| 2 | Copyright (c) 2011 Thomas Heller | |
| 3 | ||
| 4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| 6 | ==============================================================================*/ | |
| 7 | #ifndef BOOST_PHOENIX_CORE_DETAIL_PHX2_RESULT_HPP | |
| 8 | #define BOOST_PHOENIX_CORE_DETAIL_PHX2_RESULT_HPP | |
| 9 | #include <boost/phoenix/core/limits.hpp> | |
| 10 | #include <boost/phoenix/support/iterate.hpp> | |
| 11 | #include <boost/mpl/has_xxx.hpp> | |
| 12 | #include <boost/mpl/bool.hpp> | |
| 13 | ||
| 14 | namespace boost { namespace phoenix { | |
| 15 | namespace detail | |
| 16 | { | |
| 17 | BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type) | |
| 18 | ||
| 19 | template <typename Result> | |
| 20 | struct has_phx2_result_impl | |
| 21 | { | |
| 22 | typedef char yes; | |
| 23 | typedef char (&no)[2]; | |
| 24 | ||
| 25 | template <typename A> | |
| 26 | static yes check_(typename A::type *); | |
| 27 | ||
| 28 | template <typename A> | |
| 29 | static no check_(...); | |
| 30 | ||
| 31 | static bool const value = (sizeof(yes) == sizeof(check_<Result>(0))); | |
| 32 | typedef boost::mpl::bool_<value> type; | |
| 33 | }; | |
| 34 | ||
| 35 | #ifdef BOOST_PHOENIX_NO_VARIADIC_PHX2_RESULT | |
| 36 | #include <boost/phoenix/core/detail/cpp03/phx2_result.hpp> | |
| 37 | #else | |
| 38 | template <typename F, typename... A> | |
| 39 | struct has_phx2_result | |
| 40 | : mpl::eval_if< | |
| 41 | has_result_type<F> | |
| 42 | , mpl::false_ | |
| 43 | , has_phx2_result_impl<typename F::template result<F(A...)> > | |
| 44 | >::type | |
| 45 | {}; | |
| 46 | ||
| 47 | template <typename F, typename... A> | |
| 48 | struct phx2_result | |
| 49 | { | |
| 50 | typedef typename F::template result<A...>::type type; | |
| 51 | }; | |
| 52 | ||
| 53 | template <typename F, typename... A> | |
| 54 | struct phx2_result<F, A &...> | |
| 55 | { | |
| 56 | typedef typename F::template result<A...>::type type; | |
| 57 | }; | |
| 58 | ||
| 59 | template <typename F, typename... A> | |
| 60 | struct phx2_result<F, A const &...> | |
| 61 | { | |
| 62 | typedef typename F::template result<A...>::type type; | |
| 63 | }; | |
| 64 | #endif | |
| 65 | } | |
| 66 | }} | |
| 67 | ||
| 68 | #endif | |
| 69 |