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// Copyright 2013 Alex Reece.
//
// A cross platform monotonic timer.
// see https://github.com/awreece/monotonic_timer
#ifndef MONOTONIC_TIMER_H_
#define MONOTONIC_TIMER_H_
#include "uscxml/Common.h"
// Returns seconds since some unspecified start time (guaranteed to be
// monotonicly increasing).
// Copyright 2015 Stefan Radomski.
namespace uscxml {
class USCXML_API Timer {
public:
static double monotonic_seconds();
Timer() {
invocations = 0;
elapsed = 0;
}
void start() {
if (invocations == 0) {
started = monotonic_seconds();
}
invocations++;
}
void reset() {
elapsed = 0;
}
void stop() {
if (invocations == 0)
return;
invocations--;
if (invocations == 0) {
elapsed += monotonic_seconds() - started;
}
}
~Timer() {
}
double elapsed;
protected:
size_t invocations;
double started;
};
class USCXML_API Measurement {
public:
Measurement(Timer* timer) : timer(timer) {
timer->start();
}
~Measurement() {
timer->stop();
}
protected:
Timer* timer;
};
}
#endif // MONOTONIC_TIMER_H_
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