Timing.hpp

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#pragma once
 
#include <chrono>
#include <iomanip>
#include <sstream>
#include <string>
#include <utility>
 
namespace ppforest2::io {
  inline std::string now_iso8601() {
    auto now    = std::chrono::system_clock::now();
    auto time_t = std::chrono::system_clock::to_time_t(now);
    std::tm tm  = {};
 
#ifdef _WIN32
    localtime_s(&tm, &time_t);
#else
    localtime_r(&time_t, &tm);
#endif
 
    std::ostringstream ss;
    ss << std::put_time(&tm, "%Y-%m-%dT%H:%M:%S");
    return ss.str();
  }

  template<typename F> auto measure_time_ms(F&& f) {
    auto str = std::chrono::high_resolution_clock::now();
    auto res = f();
    auto end = std::chrono::high_resolution_clock::now();
    auto dur = std::chrono::duration_cast<std::chrono::milliseconds>(end - str);
 
    return std::make_pair(std::move(res), dur.count());
  }
}