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/* This file is part of the Gudhi Library. The Gudhi library
* (Geometric Understanding in Higher Dimensions) is a generic C++
* library for computational topology.
*
* Author(s): David Salinas
*
* Copyright (C) 2014 Inria
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CLOCK_H_
#define CLOCK_H_
#include <iostream>
#include <string>
#include <chrono>
namespace Gudhi {
class Clock {
public:
// Construct and start the timer
Clock(const std::string& msg_ = std::string())
: startTime(std::chrono::system_clock::now()),
end_called(false),
msg(msg_) { }
// Restart the timer
void begin() const {
end_called = false;
startTime = std::chrono::system_clock::now();
}
// Stop the timer
void end() const {
end_called = true;
endTime = std::chrono::system_clock::now();
}
std::string message() const {
return msg;
}
// Print current value to std::cout
void print() const {
std::cout << *this << std::endl;
}
friend std::ostream& operator<<(std::ostream& stream, const Clock& clock) {
if (!clock.msg.empty())
stream << clock.msg << ": ";
stream << clock.num_seconds() << "s\n";
return stream;
}
// Get the number of seconds between the timer start and:
// - the last call of end() if it was called
// - or now otherwise. In this case, the timer is not stopped.
double num_seconds() const {
if (!end_called) {
auto end = std::chrono::system_clock::now();
return std::chrono::duration_cast<std::chrono::milliseconds>(end-startTime).count() / 1000.;
} else {
return std::chrono::duration_cast<std::chrono::milliseconds>(endTime-startTime).count() / 1000.;
}
}
private:
mutable std::chrono::time_point<std::chrono::system_clock> startTime, endTime;
mutable bool end_called;
std::string msg;
};
} // namespace Gudhi
#endif // CLOCK_H_
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