C++ Language/ErrorHandling/CppExceptionHandling

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If some exceptionally problematic situation might occur in code (either your code or library functions that you call), enclose that code within try {your code} catch (...) {handler}. When your problem occurs, your code "throws an exception" by doing throw 99;, and program flow will jump to the handler (even if that requires the C++ language to "unwind" a series of called functions). That data (99 in this example) is an explanation for what went wrong; it is typed so you could actually program a sequence of catch (int aiExplanation) {handler} with catch (...) meaning "all other types".

Additional information about C++ Exception Handling