TBaAssert class has two methods: AssertDebL and AssertRelL, which can do a panic or leave depending on the iErrorAction value. If the TBaAssert object is created with TBaAssert::ELeave constant, then AssertDebL/AssertRelL methods will leave when called (if aAssertExprVal argument is EFalse). If the TBaAssert object is created with TBaAssert::EPanic constant, then AssertDebL/AssertRelL methods will panic when called (if aAssertExprVal argument is EFalse). If the TBaAssert object is created using the default constructor - by default the methods will panic. The class size has to be exactly sizeof(enum), because objects of that class are used in some legacy code - replacing an existing enum data member.