Isolating the environment locally

The class TFPEnvironmentScope supports functions which run in an isolated scope. Its constructor saves the current state and optionally installs a new one. Its destructor unconditionally restores the saved prior state.

      #pragma fenv_access on
  double IsolatedFunction(double x) {
      TFPEnvironmentScope localEnvironment(kFPToNearest);
      // compute result, rounding to nearest
      return result; // return value without setting flags
  
}
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