// if the type of object being contained has no appropriate comparison operators
// defined (specifically, if operators '<' and '==' are undefined). This seems
// to be the case with ptw32 'pthread_t' which is a simple struct.
// if the type of object being contained has no appropriate comparison operators
// defined (specifically, if operators '<' and '==' are undefined). This seems
// to be the case with ptw32 'pthread_t' which is a simple struct.