example.cxx

#include <chrono>
#include <thread>

#include "print_time.hxx"

int main()
{
  print_time
  ( []()
    {
      // target code
      std::this_thread::sleep_for(std::chrono::seconds(1));
    }
  , "example"
  );
}

print_time.hxx

#pragma once
#include <chrono>
#include <string>
#include <iostream>

inline const std::chrono::microseconds time(const std::function<void()>& f)
{
  const auto begin = std::chrono::high_resolution_clock::now();
  f();
  return std::chrono::duration_cast<std::chrono::microseconds>
    (std::chrono::high_resolution_clock::now() - begin);
}

inline void print_time(const std::function<void()>& f, const std::string& title = "unknown")
{
  auto t = time(f);
  std::cerr << "time of " << title << ": " << t.count() << " [us]\n";
}