https://skydrive.live.com/?cid=f1b8ff18a2aec5c5&id=F1B8FF18A2AEC5C5!1158&authkey=!APo6bfP5sJ8EmH4

ScopeGuard11.hpp

template <class Fun>
class ScopeGuard {
  Fun f_;
	bool active_;
public:
	ScopeGuard(Fun f)
		: f_(std::move(f))
		, active_(true) {
	}
	~ScopeGuard() { if (active_) f_(); }
	void dismiss() { active_ = false; }
	ScopeGuard() = delete;
	ScopeGuard(const ScopeGuard&) = delete;
	ScopeGuard& operator=(const ScopeGuard&) = delete;
	ScopeGuard(ScopeGuard&& rhs)
		: f_(std::move(rhs.f_))
		, active_(rhs.active_) {
			rhs.dismiss();
	}
};

namespace detail {
	enum class ScopeGuardOnExit {};
	template <typename Fun>
	ScopeGuard<Fun> operator+(ScopeGuardOnExit, Fun&& fn) {
			return ScopeGuard<Fun>(std::forward<Fun>(fn));
	}
}

#define SCOPE_EXIT \
	auto ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE) \
	= ::detail::ScopeGuardOnExit() + [&]()

#define CONCATENATE_IMPL(s1, s2) s1##s2
#define CONCATENATE(s1, s2) CONCATENATE_IMPL(s1, s2)
#ifdef __COUNTER__
#define ANONYMOUS_VARIABLE(str) \
	CONCATENATE(str, __COUNTER__)
#else
#define ANONYMOUS_VARIABLE(str) \
	CONCATENATE(str, __LINE__)
#endif