#pragma once
#include <cstdlib>
#include <stdexcept>

template<class T>
class Vector
{
private:
	T * data;
	std::size_t size;

public:
	void Resize(std::size_t const newSize)
	{
		if(newSize == 0ul)
		{
			std::free(data);
			data = nullptr;
			return;
		}

		void * result = std::realloc(data, newSize * sizeof(T));
		if(result == nullptr)
		{
			throw std::runtime_error("Cannot allocate the requested size of memory.");
		}

		size = newSize;
		data = reinterpret_cast<T *>(result);
	}

	T & operator[](std::size_t const index)
	{
		if(index >= size)
		{
			throw std::out_of_range("Index is greater or equal to size.");
		}
		return data[index];
	}

	std::size_t GetSize() const
	{
		return size;
	}

	Vector()
		: data(nullptr),
		size(0U)
	{}
};