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