projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /*============================================================================= |
| 2 | Copyright (c) 2001-2014 Joel de Guzman | |
| 3 | Copyright (c) 2001-2012 Hartmut Kaiser | |
| 4 | http://spirit.sourceforge.net/ | |
| 5 | ||
| 6 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 7 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
| 8 | =============================================================================*/ | |
| 9 | #if !defined(BOOST_SPIRIT_X3_MAKE_ATTRIBUTE_JAN_8_2012_0721PM) | |
| 10 | #define BOOST_SPIRIT_X3_MAKE_ATTRIBUTE_JAN_8_2012_0721PM | |
| 11 | ||
| 12 | #include <boost/mpl/if.hpp> | |
| 13 | #include <boost/type_traits/remove_const.hpp> | |
| 14 | #include <boost/type_traits/add_reference.hpp> | |
| 15 | #include <boost/spirit/home/x3/support/unused.hpp> | |
| 16 | ||
| 17 | namespace boost { namespace spirit { namespace x3 { namespace traits | |
| 18 | { | |
| 19 | template <typename Attribute> | |
| 20 | struct make_attribute_base | |
| 21 | { | |
| 22 | static Attribute call(unused_type) | |
| 23 | { | |
| 24 | // synthesize the attribute/parameter | |
| 25 | return Attribute(); | |
| 26 | } | |
| 27 | ||
| 28 | template <typename T> | |
| 29 | static T& call(T& value) | |
| 30 | { | |
| 31 | return value; // just pass the one provided | |
| 32 | } | |
| 33 | }; | |
| 34 | ||
| 35 | template <typename Attribute, typename ActualAttribute> | |
| 36 | struct make_attribute : make_attribute_base<Attribute> | |
| 37 | { | |
| 38 | typedef ActualAttribute& type; | |
| 39 | typedef ActualAttribute value_type; | |
| 40 | }; | |
| 41 | ||
| 42 | template <typename Attribute> | |
| 43 | struct make_attribute<Attribute, unused_type> | |
| 44 | : make_attribute_base<Attribute> | |
| 45 | { | |
| 46 | typedef typename remove_const<Attribute>::type attribute_type; | |
| 47 | typedef attribute_type type; | |
| 48 | typedef attribute_type value_type; | |
| 49 | }; | |
| 50 | ||
| 51 | template <typename Attribute, typename ActualAttribute> | |
| 52 | struct make_attribute<Attribute&, ActualAttribute> | |
| 53 | : make_attribute<Attribute, ActualAttribute> {}; | |
| 54 | ||
| 55 | template <typename Attribute, typename ActualAttribute> | |
| 56 | struct make_attribute<Attribute const&, ActualAttribute> | |
| 57 | : make_attribute<Attribute const, ActualAttribute> {}; | |
| 58 | ||
| 59 | template <typename ActualAttribute> | |
| 60 | struct make_attribute<unused_type, ActualAttribute> | |
| 61 | { | |
| 62 | typedef unused_type type; | |
| 63 | typedef unused_type value_type; | |
| 64 | static unused_type call(unused_type) | |
| 65 | { | |
| 66 | return unused; | |
| 67 | } | |
| 68 | }; | |
| 69 | ||
| 70 | template <> | |
| 71 | struct make_attribute<unused_type, unused_type> | |
| 72 | { | |
| 73 | typedef unused_type type; | |
| 74 | typedef unused_type value_type; | |
| 75 | static unused_type call(unused_type) | |
| 76 | { | |
| 77 | return unused; | |
| 78 | } | |
| 79 | }; | |
| 80 | }}}} | |
| 81 | ||
| 82 | #endif |