SafeScalar.h
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	// A Scalar that asserts for uninitialized access.
	template<typename T>
	class SafeScalar {
	public:
	SafeScalar() : initialized_(false) {}
	SafeScalar(const SafeScalar& other) {
	*this = other;
	}
	SafeScalar& operator=(const SafeScalar& other) {
	val_ = T(other);
	initialized_ = true;
	return *this;
	}

	SafeScalar(T val) : val_(val), initialized_(true) {}
	SafeScalar& operator=(T val) {
	val_ = val;
	initialized_ = true;
	}

	operator T() const {
	VERIFY(initialized_ && "Uninitialized access.");
	return val_;
	}

	private:
	T val_;
	bool initialized_;
	};