Once.h

#pragma once

#include <functional>

class Once
{
public:
	using Work = std::function<void()>;
	Once(){}
	Once(Work work) {
		setWork(work);
	}
	void setWork(Work work) {
		work_ = work;
	}
	void expire() { is_expired_ = true; }
	void restore() { is_expired_ = false; }
	bool run() {
		if(is_expired_) {
			return false;
		}
		force();
		return true;
	}
	void force() {
		work_();
		is_expired_ = true;
	}
private:
	Work work_;
	bool is_expired_=false;
};