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#ifndef TIMER_H_
#define TIMER_H_
#include <ctime>
#include <iostream>
#include <sstream>
#include <iomanip>
#ifdef USE_FINE_TIMER
#include <sys/time.h>
#endif
using namespace std;
#ifdef USE_FINE_TIMER
/* Subtract the ‘struct timeval’ values X and Y, storing the result in RESULT.
Return 1 if the difference is negative, otherwise 0.
Borrowed from: https://www.gnu.org/software/libc/manual/html_node/Elapsed-Time.html
*/
static inline bool timeval_subtract(timeval& result, const timeval& xin, const timeval& yin) {
/* Perform the carry for the later subtraction by updating y. */
timeval x = xin;
timeval y = yin;
if (x.tv_usec < y.tv_usec) {
int nsec = (y.tv_usec - x.tv_usec) / 1000000 + 1;
y.tv_usec -= 1000000 * nsec;
y.tv_sec += nsec;
}
if (x.tv_usec - y.tv_usec > 1000000) {
int nsec = (x.tv_usec - y.tv_usec) / 1000000;
y.tv_usec += 1000000 * nsec;
y.tv_sec -= nsec;
}
/* Compute the time remaining to wait. tv_usec is certainly positive. */
result.tv_sec = x.tv_sec - y.tv_sec;
result.tv_usec = x.tv_usec - y.tv_usec;
/* Return 1 if result is negative. */
return x.tv_sec < y.tv_sec;
}
/**
* Use gettimeofday() call to keep track of elapsed time between creation and
* destruction. If verbose is true, Timer will print a message showing
* elapsed time to the given output stream upon destruction.
*/
class Timer {
public:
Timer(ostream& out = cout, const char *msg = "", bool verbose = true) :
_t(), _out(out), _msg(msg), _verbose(verbose)
{
gettimeofday(&_t, NULL);
}
/// Optionally print message
~Timer() {
if(_verbose) write(_out);
}
/// Return elapsed time since Timer object was created
time_t elapsed() const {
timeval f;
gettimeofday(&f, NULL);
return f.tv_sec - _t.tv_sec;
}
void write(ostream& out) {
timeval f;
gettimeofday(&f, NULL);
timeval diff;
timeval_subtract(diff, f, _t);
time_t hours = (diff.tv_sec / 60) / 60;
time_t minutes = (diff.tv_sec / 60) % 60;
time_t seconds = (diff.tv_sec % 60);
time_t milliseconds = (diff.tv_usec / 1000);
std::ostringstream oss;
oss << _msg << setfill ('0') << setw (2) << hours << ":"
<< setfill ('0') << setw (2) << minutes << ":"
<< setfill ('0') << setw (2) << seconds << "."
<< setfill ('0') << setw (3) << milliseconds << endl;
out << oss.str().c_str();
}
private:
timeval _t;
ostream& _out;
const char *_msg;
bool _verbose;
};
#else
/**
* Use time() call to keep track of elapsed time between creation and
* destruction. If verbose is true, Timer will print a message showing
* elapsed time to the given output stream upon destruction.
*/
class Timer {
public:
Timer(ostream& out = cout, const char *msg = "", bool verbose = true) :
_t(time(0)), _out(out), _msg(msg), _verbose(verbose) { }
/// Optionally print message
~Timer() {
if(_verbose) write(_out);
}
/// Return elapsed time since Timer object was created
time_t elapsed() const {
return time(0) - _t;
}
void write(ostream& out) {
time_t passed = elapsed();
// Print the message supplied at construction time followed
// by time elapsed formatted HH:MM:SS
time_t hours = (passed / 60) / 60;
time_t minutes = (passed / 60) % 60;
time_t seconds = (passed % 60);
std::ostringstream oss;
oss << _msg << setfill ('0') << setw (2) << hours << ":"
<< setfill ('0') << setw (2) << minutes << ":"
<< setfill ('0') << setw (2) << seconds << endl;
out << oss.str().c_str();
}
private:
time_t _t;
ostream& _out;
const char *_msg;
bool _verbose;
};
#endif // USE_FINE_TIMER
static inline void logTime(std::ostream& os, bool nl = true) {
struct tm *current;
time_t now;
time(&now);
current = localtime(&now);
std::ostringstream oss;
oss << setfill('0') << setw(2)
<< current->tm_hour << ":"
<< setfill('0') << setw(2)
<< current->tm_min << ":"
<< setfill('0') << setw(2)
<< current->tm_sec;
if(nl) oss << std::endl;
os << oss.str().c_str();
}
#endif /*TIMER_H_*/
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