...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
typedef boost::function<test_tools::assertion_result
(test_unit_id)> predicate_t;
precondition(predicate_t predicate);
Associates a predicate with a test unit that will determine its default run status at run-time. See here for more details.