For example, if you assume that an argument is not NULL, use an assertion to test that assumption. As a rule, use one assertion for each assumption. Use assertions to detect errors during development. Examine these messages carefully, because they provide clues to the cause of the assertion failure. The Output window may contain other error messages as well. You can copy the assertion message from the Output window to a text window if you want to save it for future reference. The assertion message appears in both the Output window and the Assertion Failed dialog box. When the debugger halts because of an MFC or C run-time library assertion, then if the source is available, the debugger navigates to the point in the source file where the assertion occurred. MFC ASSERT_VALID and CObject::AssertValid You can use assertions to catch logic errors, check results of an operation, and Test error conditions that should have been handled. The ANSI assert function for other C/C++ programs. Visual Studio supports C++ assertion statements that are based on the following constructs:ĬRT assertions for programs that use the C run-time library. If that condition is not true, the assertion fails, execution of your program is interrupted, and the Assertion Failed dialog box appears. Applies to: Visual Studio Visual Studio for Mac Visual Studio CodeĪn assertion statement specifies a condition that you expect to be true at a point in your program.
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