#ifndef SCOPEDASSIGN_HH

#define SCOPEDASSIGN_HH

#include <utility>

/** Assign new value to some variable and restore the original value

  * when this object goes out of scope.

  */

template<typename T> class ScopedAssign

{

public:

	ScopedAssign(const ScopedAssign&) = delete;

	ScopedAssign(ScopedAssign&&) = delete;

	ScopedAssign& operator=(const ScopedAssign&) = delete;

	ScopedAssign& operator=(ScopedAssign&&) = delete;

	template<typename T2 = T>

	[[nodiscard]] ScopedAssign(T& var_, T2&& newValue)

		: var(var_), oldValue(std::exchange(var, std::forward<T2>(newValue)))

	{

	}

	~ScopedAssign()

	{

		var = std::move(oldValue);

	}

private:

	T& var;

	T oldValue;

};

#endif