[boost] Re: Portable alternative for VS.NET __if_exists

Mårten Rånge wrote:

As a side note, I got inspired by the technique used when to enable/disable template class specializations using boost::enable_if and succeeded in creating something that managed this:

struct x { typedef std::string aggregated_type; };

struct y { };

int main(int, char*) { std::cout << is_aggregated_type_available<x>::value << std::endl; std::cout << is_aggregated_type_available<y>::value << std::endl; }

Prints: 1 0

See <boost/mpl/has_xxx.hpp> Jonathan