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#include <exception>

void report(const char *msg) noexcept;
[[noreturn]] void fast_fail(const char *msg) {
  // Report error message to operator.
  report(msg);
 
  // Terminate
  std::terminate();
}
 
void critical_function_that_fails() noexcept(false);
 
void f() {
  try {
    critical_function_that_fails();
  } catch (...) {
    fast_fail("Critical function failure");
  }
}

Note that the assert() macro is permissible under this exception, as failed assertions will notify the operator on the standard error stream in an implementation-defined manner prior to calling std::abort().

Risk Assessment

Allowing the application to abnormally terminate can lead to resources not being freed, closed, etc. It is frequently a vector for denial-of-service attacks.

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