projects / ceph.git / blame
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|---|---|---|
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1 | // |
| 2 | //======================================================================= | |
| 3 | // Copyright 1997, 1998, 1999, 2000 University of Notre Dame. | |
| 4 | // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek | |
| 5 | // | |
| 6 | // Distributed under the Boost Software License, Version 1.0. (See | |
| 7 | // accompanying file LICENSE_1_0.txt or copy at | |
| 8 | // http://www.boost.org/LICENSE_1_0.txt) | |
| 9 | //======================================================================= | |
| 10 | // | |
| 11 | ||
| 12 | #ifndef BOOST_INDIRECT_CMP_HPP | |
| 13 | #define BOOST_INDIRECT_CMP_HPP | |
| 14 | ||
| 15 | #include <functional> | |
| 16 | #include <boost/config.hpp> | |
| 17 | #include <boost/property_map/property_map.hpp> | |
| 18 | ||
| 19 | namespace boost { | |
| 20 | ||
| 21 | //: indirect_cmp | |
| 22 | // | |
| 23 | // could also do this with compose_f_gx_hx, and the member binder... | |
| 24 | // | |
| 25 | //!category: functors | |
| 26 | //!component: type | |
| 27 | //!tparam: ReadablePropertyMap - a model of ReadablePropertyMap | |
| 28 | //!definition: functor.h | |
| 29 | template <class ReadablePropertyMap, class Compare> | |
| 30 | class indirect_cmp { | |
| 31 | public: | |
| 32 | typedef typename boost::property_traits<ReadablePropertyMap>::value_type T; | |
| 33 | typedef typename boost::property_traits<ReadablePropertyMap>::key_type K; | |
| 34 | typedef K first_argument_type; | |
| 35 | typedef K second_argument_type; | |
| 36 | typedef bool result_type; | |
| 37 | inline indirect_cmp(const ReadablePropertyMap& df, const Compare& c = Compare()) | |
| 38 | : d(df), cmp(c) { } | |
| 39 | ||
| 40 | template <class A, class B> | |
| 41 | inline bool | |
| 42 | operator()(const A& u, const B& v) const { | |
| 43 | const T& du = get(d, u); | |
| 44 | const T& dv = get(d, v); | |
| 45 | return cmp(du, dv); | |
| 46 | } | |
| 47 | protected: | |
| 48 | ReadablePropertyMap d; | |
| 49 | Compare cmp; | |
| 50 | }; | |
| 51 | ||
| 52 | template <typename Compare, typename ReadablePropertyMap> | |
| 53 | indirect_cmp<ReadablePropertyMap, Compare> | |
| 54 | make_indirect_cmp(const Compare& cmp, ReadablePropertyMap pmap) { | |
| 55 | indirect_cmp<ReadablePropertyMap, Compare> p(pmap, cmp); | |
| 56 | return p; | |
| 57 | } | |
| 58 | ||
| 59 | template <class ReadablePropertyMap> | |
| 60 | class indirect_pmap { | |
| 61 | public: | |
| 62 | typedef typename boost::property_traits<ReadablePropertyMap>::value_type T; | |
| 63 | typedef typename boost::property_traits<ReadablePropertyMap>::key_type K; | |
| 64 | typedef K argument_type; | |
| 65 | typedef T result_type; | |
| 66 | inline indirect_pmap(const ReadablePropertyMap& df) | |
| 67 | : d(df) { } | |
| 68 | ||
| 69 | inline T operator()(const K& u) const { | |
| 70 | return get(d, u); | |
| 71 | } | |
| 72 | protected: | |
| 73 | ReadablePropertyMap d; | |
| 74 | }; | |
| 75 | ||
| 76 | template <typename ReadablePropertyMap> | |
| 77 | indirect_pmap<ReadablePropertyMap> | |
| 78 | make_indirect_pmap(ReadablePropertyMap pmap) { | |
| 79 | indirect_pmap<ReadablePropertyMap> f(pmap); | |
| 80 | return f; | |
| 81 | } | |
| 82 | ||
| 83 | ||
| 84 | } // namespace boost | |
| 85 | ||
| 86 | ||
| 87 | #endif // GGCL_INDIRECT_CMP_HPP |