timer.hpp

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/*
  mptensor - Parallel Library for Tensor Network Methods
 
  Copyright 2016 Satoshi Morita
 
  mptensor is free software: you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation, either version 3 of the
  License, or (at your option) any later version.
 
  mptensor is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with mptensor.  If not, see
  <https://www.gnu.org/licenses/>.
*/
 
#ifndef _TIMER_HPP_
#define _TIMER_HPP_
 
#if __cplusplus >= 201103L
#include <chrono>
using namespace std::chrono;
 
class Timer {
 public:
  Timer(){};
  void now() { t = system_clock::now(); };
 
 private:
  system_clock::time_point t;
 
  friend double operator-(Timer& t1, Timer& t0);
};
 
inline double operator-(Timer& t1, Timer& t0) {
  return double(duration_cast<microseconds>(t1.t - t0.t).count()) * 1.0e-6;
}
 
#else
#include <ctime>
 
class Timer {
 public:
  Timer(){};
  void now() { t = std::clock(); };
 
 private:
  clock_t t;
 
  friend double operator-(Timer& t1, Timer& t0);
};
 
inline double operator-(Timer& t1, Timer& t0) {
  return double(t1.t - t0.t) / CLOCKS_PER_SEC;
}
 
#endif
 
#endif  // _MPI_TOOL_HPP_