Visual C++ has its own variations of the assert and verify macors that are used in debugging. They both both are only written in debug builds of your program, they both query an expression as to whether or not it is true or false, and they both throw an assertion if its expression is false. Seem redundant? Aren't these interchangable? No, they both behave differently when you compile a release version of your program, and not knowing the difference between the two will have drastic results. The big difference between these two is that in the release versin:

ASSERT will not written out, and its expression that would have been evaluated will be deleted.

VERIFY will not written out, but its expression that would have been evaluated will be left intact.

Here is an example that demonstates creating a window (in a window class' constructor) and making sure that it's created properly (don't worry about the create parameters):

ASSERT(this->create(CProject::IDD_Dialog, pParent));

this->ShowWindow(SW_NORMAL);

or:

VERIFY(this->create(CProject::IDD_Dialog, pParent));

this->ShowWindow(SW_NORMAL);