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template<class T>
struct GrowArray
{
	T *mem = nullptr;
	size_t count = 0;
	size_t alloc = 0;

	GrowArray(size_t init = 0)
	{
		if(init)
			Grow(init);
	}
	~GrowArray()
	{
		if(mem)
			free(mem);
		mem = nullptr;
		count = 0;
		alloc = 0;
	}

	// non-copyable
	GrowArray(const GrowArray &) = delete;
	GrowArray &operator = (const GrowArray &) = delete;

	void noinline Grow(size_t size)
	{
		if(!size)
			size = 32;
		T *newMem = (T*)(mem? realloc(mem, sizeof(T) * size): malloc(sizeof(T)*size));

		if(!newMem)
			return;

		alloc = size;
		mem = newMem;
	}

	// TODO: insert/append
	bool Add(const T& newVal)
	{
		size_t newIdx = count + 1;
		if(unlikely(newIdx > alloc))
			Grow(alloc * 2);
		if(unlikely(newIdx > alloc))
			return false;
		mem[count] = newVal;
		count = newIdx;
		return true;
	}

	// TODO: test
	bool RemoveAt(size_t idx)
	{
		if(idx < count)
			memmove(&mem[idx], &mem[idx+1], sizeof(T) * (count - idx - 1));
		if(idx <= count)
		{
			count--;
			return true;
		}
		return false;
	}
	T& operator[](size_t i) const
	{
		return mem[i];
	}
};