Chris@16: //
Chris@16: //=======================================================================
Chris@16: // Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
Chris@16: // Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //=======================================================================
Chris@16: //
Chris@16: 
Chris@16: #ifndef BOOST_INDIRECT_CMP_HPP
Chris@16: #define BOOST_INDIRECT_CMP_HPP
Chris@16: 
Chris@16: #include <functional>
Chris@16: #include <boost/config.hpp>
Chris@16: #include <boost/property_map/property_map.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16:   //: indirect_cmp
Chris@16:   //
Chris@16:   // could also do this with compose_f_gx_hx, and the member binder...
Chris@16:   //
Chris@16:   //!category: functors
Chris@16:   //!component: type
Chris@16:   //!tparam: ReadablePropertyMap - a model of ReadablePropertyMap
Chris@16:   //!definition: functor.h
Chris@16:   template <class ReadablePropertyMap, class Compare>
Chris@16:   class indirect_cmp {
Chris@16:   public:
Chris@16:     typedef typename boost::property_traits<ReadablePropertyMap>::value_type T;
Chris@16:     typedef typename boost::property_traits<ReadablePropertyMap>::key_type K;
Chris@16:     typedef K first_argument_type;
Chris@16:     typedef K second_argument_type;
Chris@16:     typedef bool result_type;
Chris@16:     inline indirect_cmp(const ReadablePropertyMap& df, const Compare& c = Compare())
Chris@16:       : d(df), cmp(c) { }
Chris@16: 
Chris@16:     template <class A, class B>
Chris@16:     inline bool 
Chris@16:     operator()(const A& u, const B& v) const {
Chris@16:       const T& du = get(d, u);
Chris@16:       const T& dv = get(d, v);
Chris@16:       return cmp(du, dv);
Chris@16:     }
Chris@16:   protected:
Chris@16:     ReadablePropertyMap d;
Chris@16:     Compare cmp;
Chris@16:   };
Chris@16: 
Chris@16:   template <typename Compare, typename ReadablePropertyMap>
Chris@16:   indirect_cmp<ReadablePropertyMap, Compare>
Chris@16:   make_indirect_cmp(const Compare& cmp, ReadablePropertyMap pmap) {
Chris@16:     indirect_cmp<ReadablePropertyMap, Compare> p(pmap, cmp);
Chris@16:     return p;
Chris@16:   }
Chris@16: 
Chris@16:   template <class ReadablePropertyMap>
Chris@16:   class indirect_pmap {
Chris@16:   public:
Chris@16:     typedef typename boost::property_traits<ReadablePropertyMap>::value_type T;
Chris@16:     typedef typename boost::property_traits<ReadablePropertyMap>::key_type K;
Chris@16:     typedef K argument_type;
Chris@16:     typedef T result_type;
Chris@16:     inline indirect_pmap(const ReadablePropertyMap& df)
Chris@16:       : d(df) { }
Chris@16: 
Chris@16:     inline T operator()(const K& u) const {
Chris@16:       return get(d, u);
Chris@16:     }
Chris@16:   protected:
Chris@16:     ReadablePropertyMap d;
Chris@16:   };
Chris@16: 
Chris@16:   template <typename ReadablePropertyMap>
Chris@16:   indirect_pmap<ReadablePropertyMap>
Chris@16:   make_indirect_pmap(ReadablePropertyMap pmap) {
Chris@16:     indirect_pmap<ReadablePropertyMap> f(pmap);
Chris@16:     return f;
Chris@16:   }
Chris@16: 
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: 
Chris@16: #endif // GGCL_INDIRECT_CMP_HPP