Re: [Boost-users] trying to build custom property_map

Subject: Re: [Boost-users] trying to build custom property_map
From: Sandeep Gupta (gupta.sandeep_at_[hidden])
Date: 2010-04-01 02:52:01

> 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.

-Sandeep