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265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* A compile-time constant-length array, with bounds-checking assertions -- but
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* unlike mozilla::Array, with indexes biased by a constant.
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*
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* Thus where mozilla::Array<int, 3> is a three-element array indexed by [0, 3),
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* mozilla::RangedArray<int, 8, 3> is a three-element array indexed by [8, 11).
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*/
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#ifndef mozilla_RangedArray_h
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#define mozilla_RangedArray_h
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#include "mozilla/Array.h"
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namespace mozilla {
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template <typename T, size_t MinIndex, size_t Length>
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class RangedArray {
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private:
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typedef Array<T, Length> ArrayType;
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ArrayType mArr;
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public:
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T& operator[](size_t aIndex) {
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MOZ_ASSERT(aIndex == MinIndex || aIndex > MinIndex);
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return mArr[aIndex - MinIndex];
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}
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const T& operator[](size_t aIndex) const {
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MOZ_ASSERT(aIndex == MinIndex || aIndex > MinIndex);
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return mArr[aIndex - MinIndex];
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}
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typedef typename ArrayType::iterator iterator;
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typedef typename ArrayType::const_iterator const_iterator;
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typedef typename ArrayType::reverse_iterator reverse_iterator;
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typedef typename ArrayType::const_reverse_iterator const_reverse_iterator;
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// Methods for range-based for loops.
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iterator begin() { return mArr.begin(); }
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const_iterator begin() const { return mArr.begin(); }
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const_iterator cbegin() const { return mArr.cbegin(); }
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iterator end() { return mArr.end(); }
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const_iterator end() const { return mArr.end(); }
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const_iterator cend() const { return mArr.cend(); }
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// Methods for reverse iterating.
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reverse_iterator rbegin() { return mArr.rbegin(); }
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const_reverse_iterator rbegin() const { return mArr.rbegin(); }
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const_reverse_iterator crbegin() const { return mArr.crbegin(); }
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reverse_iterator rend() { return mArr.rend(); }
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const_reverse_iterator rend() const { return mArr.rend(); }
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const_reverse_iterator crend() const { return mArr.crend(); }
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};
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} // namespace mozilla
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#endif // mozilla_RangedArray_h
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