id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
4715	custom property_map no longer works for astar_search	Szymon Gatner <szymon.gatner@…>	Jeremiah Willcock	"After updating from boost 1.43 to 1.44 code calling astar_search with custom property map no longer compiles with error:

Error	2	error C2039: 'value_type' : is not a member of 'boost::property_traits<PA>'	c:\libs\boost_1_44_0\boost\graph\astar_search.hpp	323

dijkstra_shortest_paths_no_color_map() with same property map still compiles correctly.

custom property map:


{{{
template <typename Functor, typename Arg>
struct function_property_map {
private:
  Functor f;

public:
  typedef typename boost::property_traits<
    function_property_map<Functor, Arg>
  >::value_type
  value_type; 

  explicit function_property_map(const Functor& f): f(f) {}

  friend value_type get(const function_property_map& pm, const Arg& x) {
    return pm.f(x);
  }
};

namespace boost {
  template <typename Functor, typename Arg>
  struct property_traits<function_property_map<Functor, Arg> > {
    typedef typename boost::result_of<Functor(Arg)>::type value_type;
    typedef value_type reference;
    typedef Arg key_type;
    typedef boost::readable_property_map_tag category;
  };
}

template <typename Arg, typename Functor>
function_property_map<Functor, Arg>
make_function_property_map(const Functor& f) {
  return function_property_map<Functor, Arg>(f);
}
}}}

"	Bugs	closed	To Be Determined	graph	Boost 1.44.0	Problem	fixed