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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 bool 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
{
const T& du = get(d, u);
const T& 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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