text: // Copyright (C) 2019 Internet Systems Consortium, Inc. ("ISC")
  //
  // This Source Code Form is subject to the terms of the Mozilla Public
  // License, v. 2.0. If a copy of the MPL was not distributed with this
  // file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
  #ifndef DOUBLES_H
  #define DOUBLES_H
  
  #include <complex>
  
  namespace isc {
  namespace util {
  
  /// @brief Tests two doubles for equivalence within a given tolerance.
  ///
  /// @param a comparison operand one
  /// @param b comparison operand two
  /// @param tolerance the amount by which the two values may differ and
  /// still be considered "equal".
  /// @return True if the two values differ by less than the tolerance.
  inline bool areDoublesEquivalent(double a, double b, double tolerance=0.000001) {
      return(std::abs(a - b) < tolerance);
  }
  
  } // namespace util
  } // namespace isc
  
  #endif // DOUBLES_H
  