#pragma once
#include <chrono>
#include <functional>
#include <assert.h>
namespace drogon
{
class StopWatch
{
  public:
    StopWatch() : start_(std::chrono::steady_clock::now())
    {
    }
    ~StopWatch()
    {
    }
    void reset()
    {
        start_ = std::chrono::steady_clock::now();
    }
    double elapsed() const
    {
        return std::chrono::duration_cast<std::chrono::duration<double>>(
                   std::chrono::steady_clock::now() - start_)
            .count();
    }
  private:
    std::chrono::steady_clock::time_point start_;
};
class LifeTimeWatch
{
  public:
    LifeTimeWatch(std::function<void(double)> callback)
        : stopWatch_(), callback_(std::move(callback))
    {
        assert(callback_);
    }
    ~LifeTimeWatch()
    {
        callback_(stopWatch_.elapsed());
    }
  private:
    StopWatch stopWatch_;
    std::function<void(double)> callback_;
};
}