[Boost-users] [test] BOOST_CHECK_EQUAL type to stream

I understand why the types of the arguments to BOOST_CHECK_EQUAL (and BOOST_CHECK_PREDICATE, etc.) must have operator<< correctly defined. Otherwise, the failure message could not be properly printed. The type I want to check is vector<int>. But it seems not to be enough to simply define the following function: ostream& operator<<(ostream& out, const vector<int>& vec); The error message is long and very templatey, but the essence is: .../test_tools.hpp:298: error: no match for 'operator<<' in 'ostr << t' What more should I do to be able to use vector<int> in these tests? Thanks! -- Michiel Helvensteijn