Anonymous user
Assertions: Difference between revisions
→{{header|C}}
Line 62:
There is no mechanism to add a custom "message" with your assertion, like in other languages. However, there is a "trick" to do this, by simply logical-AND-ing your condition with a string constant message, like in the following. Since a string constant is guaranteed to be non-NULL (and hence evaluated as True), and since AND-ing with True is an identity operation for a boolean, it will not alter the behavior of the assertion, but it will get captured in the debug message that is printed:
<lang c>assert(a == 42 && "Error message");</lang>
This trick only works with compile-time string literals, however, since the assertion message is captured by the macro at compile-time.
=={{header|C++}}==
| |||