projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*============================================================================= |
| 2 | Copyright (c) 2001-2011 Joel de Guzman | |
| 3 | Copyright (c) 2001-2011 Hartmut Kaiser | |
| 4 | ||
| 5 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 6 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| 7 | ==============================================================================*/ | |
| 8 | #if !defined(BOOST_SPIRIT_UNUSED_APRIL_16_2006_0616PM) | |
| 9 | #define BOOST_SPIRIT_UNUSED_APRIL_16_2006_0616PM | |
| 10 | ||
| 11 | #if defined(_MSC_VER) | |
| 12 | #pragma once | |
| 13 | #endif | |
| 14 | ||
| 15 | #include <boost/config.hpp> | |
| 16 | #include <boost/mpl/bool.hpp> | |
| 17 | ||
| 18 | #if defined(BOOST_MSVC) | |
| 19 | # pragma warning(push) | |
| 20 | # pragma warning(disable: 4522) // multiple assignment operators specified warning | |
| 21 | #endif | |
| 22 | ||
| 23 | /////////////////////////////////////////////////////////////////////////////// | |
| 24 | namespace boost { namespace spirit | |
| 25 | { | |
| 26 | /////////////////////////////////////////////////////////////////////////// | |
| 27 | // We do not import fusion ::unused_type anymore to avoid boost::fusion | |
| 28 | // being turned into an associate namespace for boost::spirit, as this | |
| 29 | // interferes with ADL in unexpected ways. We rather copy the full | |
| 30 | // unused_type implementation from boost::fusion. | |
| 31 | /////////////////////////////////////////////////////////////////////////// | |
| 32 | struct unused_type | |
| 33 | { | |
| 34 | unused_type() | |
| 35 | { | |
| 36 | } | |
| 37 | ||
| 38 | template <typename T> | |
| 39 | unused_type(T const&) | |
| 40 | { | |
| 41 | } | |
| 42 | ||
| 43 | template <typename T> | |
| 44 | unused_type const& | |
| 45 | operator=(T const&) const | |
| 46 | { | |
| 47 | return *this; | |
| 48 | } | |
| 49 | ||
| 50 | template <typename T> | |
| 51 | unused_type& | |
| 52 | operator=(T const&) | |
| 53 | { | |
| 54 | return *this; | |
| 55 | } | |
| 56 | ||
| 57 | unused_type const& | |
| 58 | operator=(unused_type const&) const | |
| 59 | { | |
| 60 | return *this; | |
| 61 | } | |
| 62 | ||
| 63 | unused_type& | |
| 64 | operator=(unused_type const&) | |
| 65 | { | |
| 66 | return *this; | |
| 67 | } | |
| 68 | }; | |
| 69 | ||
| 70 | unused_type const unused = unused_type(); | |
| 71 | ||
| 72 | namespace detail | |
| 73 | { | |
| 74 | struct unused_only | |
| 75 | { | |
| 76 | unused_only(unused_type const&) {} | |
| 77 | }; | |
| 78 | } | |
| 79 | ||
| 80 | template <typename Out> | |
| 81 | inline Out& operator<<(Out& out, detail::unused_only const&) | |
| 82 | { | |
| 83 | return out; | |
| 84 | } | |
| 85 | ||
| 86 | template <typename In> | |
| 87 | inline In& operator>>(In& in, unused_type&) | |
| 88 | { | |
| 89 | return in; | |
| 90 | } | |
| 91 | ||
| 92 | /////////////////////////////////////////////////////////////////////////// | |
| 93 | namespace traits | |
| 94 | { | |
| 95 | // We use this test to detect if the argument is not an unused_type | |
| 96 | template <typename T> struct not_is_unused : mpl::true_ {}; | |
| 97 | template <> struct not_is_unused<unused_type> : mpl::false_ {}; | |
| 98 | } | |
| 99 | }} | |
| 100 | ||
| 101 | #if defined(BOOST_MSVC) | |
| 102 | # pragma warning(pop) | |
| 103 | #endif | |
| 104 | ||
| 105 | #endif |