/* Copyright (c) 2017-2018 Hans-Kristian Arntzen
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#pragma once

#include <algorithm>

namespace Util
{
template <typename T, size_t N>
class StackAllocator
{
public:
	T *allocate(size_t count)
	{
		if (count == 0)
			return nullptr;
		if (offset + count > N)
			return nullptr;

		T *ret = buffer + offset;
		offset += count;
		return ret;
	}

	T *allocate_cleared(size_t count)
	{
		T *ret = allocate(count);
		if (ret)
			std::fill(ret, ret + count, T());
		return ret;
	}

	void reset()
	{
		offset = 0;
	}

private:
	T buffer[N];
	size_t offset = 0;
};
}