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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* A compile-time constant-length array, with bounds-checking assertions -- but
* unlike mozilla::Array, with indexes biased by a constant.
*
* Thus where mozilla::Array<int, 3> is a three-element array indexed by [0, 3),
* mozilla::RangedArray<int, 8, 3> is a three-element array indexed by [8, 11).
*/
#ifndef mozilla_RangedArray_h
#define mozilla_RangedArray_h
#include "mozilla/Array.h"
namespace mozilla {
template<typename T, size_t MinIndex, size_t Length>
class RangedArray
{
private:
typedef Array<T, Length> ArrayType;
ArrayType mArr;
public:
T& operator[](size_t aIndex)
{
MOZ_ASSERT(aIndex == MinIndex || aIndex > MinIndex);
return mArr[aIndex - MinIndex];
}
const T& operator[](size_t aIndex) const
{
MOZ_ASSERT(aIndex == MinIndex || aIndex > MinIndex);
return mArr[aIndex - MinIndex];
}
typedef typename ArrayType::iterator iterator;
typedef typename ArrayType::const_iterator const_iterator;
typedef typename ArrayType::reverse_iterator reverse_iterator;
typedef typename ArrayType::const_reverse_iterator const_reverse_iterator;
// Methods for range-based for loops.
iterator begin() { return mArr.begin(); }
const_iterator begin() const { return mArr.begin(); }
const_iterator cbegin() const { return mArr.cbegin(); }
iterator end() { return mArr.end(); }
const_iterator end() const { return mArr.end(); }
const_iterator cend() const { return mArr.cend(); }
// Methods for reverse iterating.
reverse_iterator rbegin() { return mArr.rbegin(); }
const_reverse_iterator rbegin() const { return mArr.rbegin(); }
const_reverse_iterator crbegin() const { return mArr.crbegin(); }
reverse_iterator rend() { return mArr.rend(); }
const_reverse_iterator rend() const { return mArr.rend(); }
const_reverse_iterator crend() const { return mArr.crend(); }
};
} // namespace mozilla
#endif // mozilla_RangedArray_h
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