timing.h

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#pragma once
#include <chrono>                  // timing
#include <stack>
 
//using Clock = std::chrono::system_clock;   //!< The wall clock timer chosen
using Clock = std::chrono::high_resolution_clock;
using TPoint= std::chrono::time_point<Clock>;
 
// [Galowicz, C++17 STL Cookbook, p. 29]
inline 
std::stack<TPoint> MyStopWatch; 
 
inline auto tic()
{
    MyStopWatch.push(Clock::now());
    return MyStopWatch.top();
}
 
inline double toc(TPoint const &t_b = MyStopWatch.top())
{
    // https://en.cppreference.com/w/cpp/chrono/treat_as_floating_point
    using Unit      = std::chrono::seconds;
    using FpSeconds = std::chrono::duration<double, Unit::period>;        
    auto t_e = Clock::now();
    MyStopWatch.pop();
    return FpSeconds(t_e-t_b).count();
}