| // |
| //======================================================================= |
| // Copyright 1997, 1998, 1999, 2000 University of Notre Dame. |
| // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek |
| // |
| // Distributed under the Boost Software License, Version 1.0. (See |
| // accompanying file LICENSE_1_0.txt or copy at |
| // http://www.boost.org/LICENSE_1_0.txt) |
| //======================================================================= |
| // |
| |
| #ifndef BOOST_INDIRECT_CMP_HPP |
| #define BOOST_INDIRECT_CMP_HPP |
| |
| #include <functional> |
| #include <boost/config.hpp> |
| #include <boost/property_map/property_map.hpp> |
| |
| namespace boost { |
| |
| //: indirect_cmp |
| // |
| // could also do this with compose_f_gx_hx, and the member binder... |
| // |
| //!category: functors |
| //!component: type |
| //!tparam: ReadablePropertyMap - a model of ReadablePropertyMap |
| //!definition: functor.h |
| template <class ReadablePropertyMap, class Compare> |
| class indirect_cmp { |
| public: |
| typedef typename boost::property_traits<ReadablePropertyMap>::value_type T; |
| typedef typename boost::property_traits<ReadablePropertyMap>::key_type K; |
| typedef K first_argument_type; |
| typedef K second_argument_type; |
| typedef T result_type; |
| inline indirect_cmp(const ReadablePropertyMap& df, const Compare& c = Compare()) |
| : d(df), cmp(c) { } |
| |
| template <class A, class B> |
| inline bool |
| operator()(const A& u, const B& v) const { |
| T du = get(d, u), dv = get(d, v); |
| return cmp(du, dv); |
| } |
| protected: |
| ReadablePropertyMap d; |
| Compare cmp; |
| }; |
| |
| template <typename Compare, typename ReadablePropertyMap> |
| indirect_cmp<ReadablePropertyMap, Compare> |
| make_indirect_cmp(const Compare& cmp, ReadablePropertyMap pmap) { |
| indirect_cmp<ReadablePropertyMap, Compare> p(pmap, cmp); |
| return p; |
| } |
| |
| template <class ReadablePropertyMap> |
| class indirect_pmap { |
| public: |
| typedef typename boost::property_traits<ReadablePropertyMap>::value_type T; |
| typedef typename boost::property_traits<ReadablePropertyMap>::key_type K; |
| typedef K argument_type; |
| typedef T result_type; |
| inline indirect_pmap(const ReadablePropertyMap& df) |
| : d(df) { } |
| |
| inline T operator()(const K& u) const { |
| return get(d, u); |
| } |
| protected: |
| ReadablePropertyMap d; |
| }; |
| |
| template <typename ReadablePropertyMap> |
| indirect_pmap<ReadablePropertyMap> |
| make_indirect_pmap(ReadablePropertyMap pmap) { |
| indirect_pmap<ReadablePropertyMap> f(pmap); |
| return f; |
| } |
| |
| |
| } // namespace boost |
| |
| |
| #endif // GGCL_INDIRECT_CMP_HPP |