FOUNDATION SERVICES - Testing for exceptions

Testing for exceptions

The exception flags in the current environment are implemented as bits in a hardware register. You can access the flags in the current environment with the member function GetFlags of an active environment. To create an active environment to test the flags instantiate a TFPEnvironmentModifier object. If you pass no argument to the constructor, it won't change the current environment. This example builds a TFPExceptionSet object containing flags to be tested:

  #pragma fenv_access on
  void CheckSeriousFlags() {
      TFPExceptionSet soughtExceptions(kFPOverflow, kFPInvalid);
      TFPEnvironmentModifier environmentSnapshot;
      if (soughtExceptions.Intersects(environmentSnapshot.GetFlags))
          // overflow or invalid have occurred--alert the user
  }

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