24.operations.stdcxx-234.cpp

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#include <iterator>
 
struct X: std::iterator<std::random_access_iterator_tag, int> { };
 
namespace std {
 
// specialize the std::distance() function template of a user-defined
// iterator type to verify that the signature of the primary template
// is the same as the one of the specialization
template <> std::iterator_traits<X>::difference_type
distance<X> (X, X) { return 0; }
 
} // namespace std
 
int main ()
{
    return int (std::distance (X (), X ()));
}