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//
//=======================================================================
// 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
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