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// Copyright (c) 2008-2020 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.

#pragma once

#include "NvCloth/Callbacks.h"

namespace nv
{
namespace cloth
{

template <class T>
struct Range
{
	/** \brief Construct an empty range.
		*/
	Range();

	/** \brief Construct a range (array like container) using existing memory.
		Range doesn't take ownership of this memory.
		Interface works similar to std::vector.
		@param begin start of the memory
		@param end end of the memory range, point to one element past the last valid element.
		*/
	Range(T* begin, T* end);

	template <typename S>
	Range(const Range<S>& other);

	uint32_t size() const;
	bool empty() const;

	void popFront();
	void popBack();

	T* begin() const;
	T* end() const;

	T& front() const;
	T& back() const;

	T& operator[](uint32_t i) const;

  private:
	T* mBegin;
	T* mEnd; // past last element (like std::vector::end())
};

template <typename T>
Range<T>::Range()
: mBegin(0), mEnd(0)
{
}

template <typename T>
Range<T>::Range(T* begin, T* end)
: mBegin(begin), mEnd(end)
{
}

template <typename T>
template <typename S>
Range<T>::Range(const Range<S>& other)
: mBegin(other.begin()), mEnd(other.end())
{
}

template <typename T>
uint32_t Range<T>::size() const
{
	return uint32_t(mEnd - mBegin);
}

template <typename T>
bool Range<T>::empty() const
{
	return mBegin >= mEnd;
}

template <typename T>
void Range<T>::popFront()
{
	NV_CLOTH_ASSERT(mBegin < mEnd);
	++mBegin;
}

template <typename T>
void Range<T>::popBack()
{
	NV_CLOTH_ASSERT(mBegin < mEnd);
	--mEnd;
}

template <typename T>
T* Range<T>::begin() const
{
	return mBegin;
}

template <typename T>
T* Range<T>::end() const
{
	return mEnd;
}

template <typename T>
T& Range<T>::front() const
{
	NV_CLOTH_ASSERT(mBegin < mEnd);
	return *mBegin;
}

template <typename T>
T& Range<T>::back() const
{
	NV_CLOTH_ASSERT(mBegin < mEnd);
	return mEnd[-1];
}

template <typename T>
T& Range<T>::operator[](uint32_t i) const
{
	NV_CLOTH_ASSERT(mBegin + i < mEnd);
	return mBegin[i];
}

} // namespace cloth
} // namespace nv