FPControl.h

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// This file's extension implies that it's C, but it's really -*- C++ -*-.
/*
 * Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration.
 */
#ifndef CXXUTILS_FPCONTROL_H
#define CXXUTILS_FPCONTROL_H
 
 
#include "CxxUtils/bitmask.h"
#include <fenv.h>
 
 
namespace CxxUtils {
 
 
class FPControl
{
public:
  // Known exception types.
  enum class Exc
  {
    divbyzero = 1,
    inexact = 2,
    invalid = 4,
    overflow = 8,
    underflow = 16,
    // Special value meaning all known exceptions.
    // Not necessarily the same as the OR of all the above
    // if the platform defines additional exception types beyond these.
    all = 32,
    ATH_BITMASK
  };
 
 
  FPControl();
 
 
  ~FPControl();
 
 
  void holdExceptions();
 
 
  void enable (Exc exc);
 
 
  void disable (Exc exc);
 
 
private:
  int excToMask (Exc exc);
 
  fenv_t m_env;
 
  // Mask of exceptions that have been disabled.
  int m_masked = 0;
};
 
 
 
} // namespace CxxUtils
 
 
#endif // not CXXUTILS_FPCONTROL_H