functionPropMap.h

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

//NOTE: This is copied from boost 1.51, and renamed so it should not 

#pragma once

#include <boost/config.hpp>
#include <boost/property_map/property_map.hpp>
#include <boost/type_traits.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/not.hpp>
#include <utility>

namespace boost {

   template<typename Func, typename Key, typename Ret = typename boost::result_of<const Func(const Key&)>::type>
   class DtFunctionPropertyMap: public put_get_helper<Ret, DtFunctionPropertyMap<Func, Key, Ret> > {
   public:
      typedef Key key_type;
      typedef Ret reference;
      typedef typename boost::remove_cv<typename boost::remove_reference<Ret>::type>::type value_type;

      typedef typename boost::mpl::if_<
         boost::mpl::and_<
         boost::is_reference<Ret>,
         boost::mpl::not_<boost::is_const<Ret> >
         >,
         boost::lvalue_property_map_tag,
         boost::readable_property_map_tag>::type
         category;

      DtFunctionPropertyMap(Func f = Func()) : f(f) {}

      reference operator[](const Key& k) const {
         return f(k);
      }

   private:
      Func f;
   };

   template<typename Key, typename Func>
   DtFunctionPropertyMap<Func, Key>
      DtMakeFunctionPropertyMap(const Func& f) {
         return DtFunctionPropertyMap<Func, Key>(f);
   }

   template<typename Key, typename Ret, typename Func>
   DtFunctionPropertyMap<Func, Key, Ret>
      DtMakeFunctionPropertyMap(const Func& f) {
         return DtFunctionPropertyMap<Func, Key, Ret>(f);
   }

}