Use to test your assumptions about the validity of an object’s internal state. ASSERT_VALID calls the AssertValid member function of the object passed as its argument. In the Release version of MFC, ASSERT_VALID does nothing. In the Debug version, it validates the pointer, checks against NULL, and calls the object’s own AssertValid member functions. If any of these tests fails, this displays an alert message in the same manner as ASSERT.
如果为真则继续。