projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*============================================================================= |
| 2 | Copyright (c) 2001-2014 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_X3_UNUSED_APRIL_16_2006_0616PM) | |
| 9 | #define BOOST_SPIRIT_X3_UNUSED_APRIL_16_2006_0616PM | |
| 10 | ||
| 11 | #include <ostream> | |
| 12 | #include <istream> | |
| 13 | #include <boost/mpl/identity.hpp> | |
| 14 | ||
| 15 | #if defined(BOOST_MSVC) | |
| 16 | # pragma warning(push) | |
| 17 | # pragma warning(disable: 4522) // multiple assignment operators specified warning | |
| 18 | #endif | |
| 19 | ||
| 20 | /////////////////////////////////////////////////////////////////////////////// | |
| 21 | namespace boost { namespace spirit { namespace x3 | |
| 22 | { | |
| 23 | struct unused_type | |
| 24 | { | |
| 25 | unused_type() | |
| 26 | { | |
| 27 | } | |
| 28 | ||
| 29 | template <typename T> | |
| 30 | unused_type(T const&) | |
| 31 | { | |
| 32 | } | |
| 33 | ||
| 34 | template <typename T> | |
| 35 | unused_type const& | |
| 36 | operator=(T const&) const | |
| 37 | { | |
| 38 | return *this; | |
| 39 | } | |
| 40 | ||
| 41 | template <typename T> | |
| 42 | unused_type& | |
| 43 | operator=(T const&) | |
| 44 | { | |
| 45 | return *this; | |
| 46 | } | |
| 47 | ||
| 48 | unused_type const& | |
| 49 | operator=(unused_type const&) const | |
| 50 | { | |
| 51 | return *this; | |
| 52 | } | |
| 53 | ||
| 54 | unused_type& | |
| 55 | operator=(unused_type const&) | |
| 56 | { | |
| 57 | return *this; | |
| 58 | } | |
| 59 | ||
| 60 | // unused_type can also masquerade as an empty context (see context.hpp) | |
| 61 | ||
| 62 | template <typename ID> | |
| 63 | unused_type get(ID) const | |
| 64 | { | |
| 65 | return {}; | |
| 66 | } | |
| 67 | }; | |
| 68 | ||
| 69 | auto const unused = unused_type{}; | |
| 70 | ||
| 71 | inline std::ostream& operator<<(std::ostream& out, unused_type const&) | |
| 72 | { | |
| 73 | return out; | |
| 74 | } | |
| 75 | ||
| 76 | inline std::istream& operator>>(std::istream& in, unused_type&) | |
| 77 | { | |
| 78 | return in; | |
| 79 | } | |
| 80 | }}} | |
| 81 | ||
| 82 | #if defined(BOOST_MSVC) | |
| 83 | # pragma warning(pop) | |
| 84 | #endif | |
| 85 | ||
| 86 | #endif |