#pragma once

#include <string>
#include <mutex>
#include <iostream>

namespace logger {

extern std::mutex mut;

class Timer {
public:
	Timer();

	void restart();
	void print(std::ostream &os) const;

private:
	double start_;
};

template<typename T>
inline void log(const T &msg) {
	std::unique_lock<std::mutex> lock(mut);
	std::cerr << msg << '\n';
}

template<typename T>
inline void log(const T &msg, const Timer &t) {
	std::unique_lock<std::mutex> lock(mut);
	std::cerr << msg;
	t.print(std::cerr);
	std::cerr << '\n';
}

}