sl@0: //
sl@0: //=======================================================================
sl@0: // Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
sl@0: // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
sl@0: //
sl@0: // Distributed under the Boost Software License, Version 1.0. (See
sl@0: // accompanying file LICENSE_1_0.txt or copy at
sl@0: // http://www.boost.org/LICENSE_1_0.txt)
sl@0: //=======================================================================
sl@0: //
sl@0: 
sl@0: #ifndef BOOST_INDIRECT_CMP_HPP
sl@0: #define BOOST_INDIRECT_CMP_HPP
sl@0: 
sl@0: #include <functional>
sl@0: #include <boost/config.hpp>
sl@0: #include <boost/property_map.hpp>
sl@0: 
sl@0: namespace boost {
sl@0: 
sl@0:   //: indirect_cmp
sl@0:   //
sl@0:   // could also do this with compose_f_gx_hx, and the member binder...
sl@0:   //
sl@0:   //!category: functors
sl@0:   //!component: type
sl@0:   //!tparam: ReadablePropertyMap - a model of ReadablePropertyMap
sl@0:   //!definition: functor.h
sl@0:   template <class ReadablePropertyMap, class Compare>
sl@0:   class indirect_cmp {
sl@0:   public:
sl@0:     typedef typename boost::property_traits<ReadablePropertyMap>::value_type T;
sl@0:     typedef typename boost::property_traits<ReadablePropertyMap>::key_type K;
sl@0:     typedef K first_argument_type;
sl@0:     typedef K second_argument_type;
sl@0:     typedef T result_type;
sl@0:     inline indirect_cmp(const ReadablePropertyMap& df, const Compare& c = Compare())
sl@0:       : d(df), cmp(c) { }
sl@0: 
sl@0:     template <class A, class B>
sl@0:     inline bool 
sl@0:     operator()(const A& u, const B& v) const {
sl@0:       T du = get(d, u), dv = get(d, v);
sl@0:       return cmp(du, dv);
sl@0:     }
sl@0:   protected:
sl@0:     ReadablePropertyMap d;
sl@0:     Compare cmp;
sl@0:   };
sl@0: 
sl@0:   template <typename Compare, typename ReadablePropertyMap>
sl@0:   indirect_cmp<ReadablePropertyMap, Compare>
sl@0:   make_indirect_cmp(const Compare& cmp, ReadablePropertyMap pmap) {
sl@0:     indirect_cmp<ReadablePropertyMap, Compare> p(pmap, cmp);
sl@0:     return p;
sl@0:   }
sl@0: 
sl@0:   template <class ReadablePropertyMap>
sl@0:   class indirect_pmap {
sl@0:   public:
sl@0:     typedef typename boost::property_traits<ReadablePropertyMap>::value_type T;
sl@0:     typedef typename boost::property_traits<ReadablePropertyMap>::key_type K;
sl@0:     typedef K argument_type;
sl@0:     typedef T result_type;
sl@0:     inline indirect_pmap(const ReadablePropertyMap& df)
sl@0:       : d(df) { }
sl@0: 
sl@0:     inline bool operator()(const K& u) const {
sl@0:       return get(d, u);
sl@0:     }
sl@0:   protected:
sl@0:     ReadablePropertyMap d;
sl@0:   };
sl@0: 
sl@0:   template <typename ReadablePropertyMap>
sl@0:   indirect_pmap<ReadablePropertyMap>
sl@0:   make_indirect_pmap(ReadablePropertyMap pmap) {
sl@0:     indirect_pmap<ReadablePropertyMap> f(pmap);
sl@0:     return f;
sl@0:   }
sl@0: 
sl@0: 
sl@0: } // namespace boost
sl@0: 
sl@0: 
sl@0: #endif // GGCL_INDIRECT_CMP_HPP