Changing state globally

Most applications that alter rounding modes and exploit exception flags do so only within a local scope. If you require a global change, the system provides the class TFPEnvironmentModifier. This code sample sets rounding toward zero to accommodate a program written for an older mainframe that always rounded toward zero. (It is not unusual for programs designed for a particular kind of rounding to work correctly on platforms with different range and precision but offering the same rounding.)

      
#pragma fenv_access on
  void InitializeRounding() {
      TFPEnvironmentModifier globalState(kFPTowardZero);
  }
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