time_tools.hpp

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// Copyright (c) 2013-2023 Anton Kozhevnikov, Thomas Schulthess
// All rights reserved.
//
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// the following conditions are met:
//
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//    following disclaimer.
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/** \file time_tools.hpp
 *
 *  \brief Timing functions.
 */
 
#ifndef __TIME_TOOLS_HPP__
#define __TIME_TOOLS_HPP__
 
#include <sys/time.h>
 
namespace sirius {
 
/// Return the timestamp string in a specified format.
/** Typical format strings: "%Y%m%d_%H%M%S", "%Y-%m-%d %H:%M:%S", "%H:%M:%S" */
inline auto timestamp(std::string fmt)
{
    timeval t;
    gettimeofday(&t, NULL);
 
    char buf[128];
 
    tm* ptm = localtime(&t.tv_sec);
    strftime(buf, sizeof(buf), fmt.c_str(), ptm);
    return std::string(buf);
}
 
/// Wall-clock time in seconds.
inline double wtime()
{
    timeval t;
    gettimeofday(&t, NULL);
    return double(t.tv_sec) + double(t.tv_usec) / 1e6;
}
 
using time_point_t = std::chrono::high_resolution_clock::time_point;
 
inline auto time_now()
{
    return std::chrono::high_resolution_clock::now();
}
 
inline double time_interval(std::chrono::high_resolution_clock::time_point t0)
{
    return std::chrono::duration_cast<std::chrono::duration<double>>(time_now() - t0).count();
}
 
}
 
#endif