On Wed, 31 Mar 2010, Sandeep Gupta wrote:

           Hi,
            I created a  simple property_map as follows:

           struct VecMap
           {
            typedef int value_type;

            typedef int key_type;
            typedef  read_write_property_map_tag category;

            typedef int* reference;
            std::vector<int> vec_store;

           };
           void put(VecMap& rmap, int key, int val)

           {
            rmap.vec_store[key] = val;

           }
           int get(VecMap& rmap, int key)

           {
            return rmap.vec_store[key];

           }
           /// End code
           The compiler gcc-4.4.1 against latest boost-trunk gives errorerror: no type named value_type in struct
           boost::property_traits<VecMap>
           The code however compiles fine with boost_1_40. Please take a look.
           The full code is available here http://codepad.org/KtmbXkLa


I tried the code you posted (at codepad) with GCC 3.4, 4.1, and 4.4.0 and did not receive an error.  Note that in the trunk, the
property_map header file is <boost/property_map/property_map.hpp>.

-

The posted code works with earlier version of boost. However when I change the header to boost/property_map/property_map.hpp and use
boost-trunk that it start giving errors.
I compiled against gcc 4.4.1, 4.4 and 4.2. It gives the same  error for all the three.

I changed the code to use the new header file and compiled against the trunk and still don't get any errors.  What errors are you seeing (i.e., the full gcc output)?