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/*
* Copyright (c) 2008-2018 the MRtrix3 contributors.
*
* 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/
*
* MRtrix3 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.
*
* For more details, see http://www.mrtrix.org/
*/
#ifndef __timer_h__
#define __timer_h__
#include <chrono>
#define NOMEMALIGN
namespace MR
{
class Timer { NOMEMALIGN
public:
Timer () {
start();
}
void start () {
from = std::chrono::high_resolution_clock::now();
}
double elapsed () {
return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::high_resolution_clock::now() - from).count() * 1.0e-9;
}
static double current_time () {
return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::system_clock::now().time_since_epoch()).count() * 1.0e-9;
}
protected:
std::chrono::high_resolution_clock::time_point from;
};
// a class to help perform operations at given time intervals
class IntervalTimer : protected Timer { NOMEMALIGN
public:
//! by default, fire at ~30 Hz - most monitors are 60Hz
IntervalTimer (double time_interval = 0.0333333) :
interval (std::chrono::duration_cast<std::chrono::high_resolution_clock::duration> (std::chrono::nanoseconds (std::chrono::nanoseconds::rep (1.0e9*time_interval)))),
next_time (from + interval) { }
//! return true if ready, false otherwise
/*! Note that the timer immediately resets; next invocation will return
* false until another interval has elapsed. */
operator bool() {
auto now = std::chrono::high_resolution_clock::now();
if (now < next_time)
return false;
from = now;
next_time += interval;
return true;
}
protected:
const std::chrono::high_resolution_clock::duration interval;
std::chrono::high_resolution_clock::time_point next_time;
};
}
#endif
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