Method evaluate

extern/boost/boost/test/tools/assertion.hpp:310–319

expression interface

    // expression interface
    assertion_result            evaluate( bool no_message = false ) const
    {
        assertion_result res( value() );
        if( no_message || res )
            return res;

        format_message( res.message(), value() );

        return tt_detail::format_assertion_result( "", res.message().str() );
    }

private:
    template<typename U>