scope.hpp

#include <functional>
#include <stack>

struct Scope
{
	using Callback = std::function<void()>;
	
	Scope() = default;
	Scope(Callback cb)
	{
		cbs.push(cb);
	}
	~Scope()
	{
		while(!cbs.empty())
		{
			// call all callbacks starting with the last
			cbs.top()();
			cbs.pop();
		}
	}
	
	Scope& operator += (Callback cb)
	{
		cbs.push(cb);
		return *this;
	}	
	Callback operator --()
	{
		Callback cb = cbs.top();
		cbs.pop();
		return cb;
	}

	Scope operator -- (int)
	{
		Scope prev = *this;
		cbs.pop();
		return prev;
	}
private:
	std::stack<Callback> cbs;
};