Source/cmDuration.h

   1 /* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   2    file Copyright.txt or https://cmake.org/licensing for details.  */
   3 #pragma once
   4
   5 #include <chrono>
   6 #include <ratio>
   7
   8 using cmDuration = std::chrono::duration<double, std::ratio<1>>;
   9
  10 /*
  11  * This function will return number of seconds in the requested type T.
  12  *
  13  * A duration_cast from duration<double> to duration<T> will not yield what
  14  * one might expect if the double representation does not fit into type T.
  15  * This function aims to safely convert, by clamping the double value between
  16  * the permissible valid values for T.
  17  */
  18 template <typename T>
  19 T cmDurationTo(const cmDuration& duration);
  20
  21 #ifndef CMDURATION_CPP
  22 extern template int cmDurationTo<int>(const cmDuration&);
  23 extern template unsigned int cmDurationTo<unsigned int>(const cmDuration&);
  24 #endif