stopwatch.hpp

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#pragma once
#include <chrono>
 
namespace ppl {
namespace util {
 
template <class ClockType=std::chrono::steady_clock>
struct StopWatch
{
    void start() { start_ = ClockType::now(); }
    void stop() { end_ = ClockType::now(); }
 
    double elapsed() const
    {
        static constexpr double nano = 1e-9;
        return std::chrono::duration_cast<
        std::chrono::nanoseconds>(end_-start_).count() * nano;
    }
 
private:
    std::chrono::time_point<ClockType> start_;
    std::chrono::time_point<ClockType> end_;
};
 
} // namespace util
} // namespace ppl