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99 lines
2.6 KiB
C++
99 lines
2.6 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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/* A compile-time constant-length array with bounds-checking assertions. */
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#ifndef mozilla_Array_h
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#define mozilla_Array_h
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#include "mozilla/Assertions.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Move.h"
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#include "mozilla/ReverseIterator.h"
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#include <stddef.h>
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namespace mozilla {
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template<typename T, size_t Length>
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class Array
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{
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T mArr[Length];
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public:
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Array() {}
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template <typename... Args>
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MOZ_IMPLICIT Array(Args&&... aArgs)
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: mArr{mozilla::Forward<Args>(aArgs)...}
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{
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static_assert(sizeof...(aArgs) == Length,
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"The number of arguments should be equal to the template parameter Length");
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}
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T& operator[](size_t aIndex)
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{
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MOZ_ASSERT(aIndex < Length);
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return mArr[aIndex];
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}
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const T& operator[](size_t aIndex) const
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{
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MOZ_ASSERT(aIndex < Length);
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return mArr[aIndex];
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}
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bool operator==(const Array<T, Length>& aOther) const
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{
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for (size_t i = 0; i < Length; i++) {
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if (mArr[i] != aOther[i]) {
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return false;
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}
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}
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return true;
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}
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typedef T* iterator;
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typedef const T* const_iterator;
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typedef ReverseIterator<T*> reverse_iterator;
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typedef ReverseIterator<const T*> const_reverse_iterator;
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// Methods for range-based for loops.
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iterator begin() { return mArr; }
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const_iterator begin() const { return mArr; }
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const_iterator cbegin() const { return begin(); }
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iterator end() { return mArr + Length; }
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const_iterator end() const { return mArr + Length; }
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const_iterator cend() const { return end(); }
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// Methods for reverse iterating.
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reverse_iterator rbegin() { return reverse_iterator(end()); }
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const_reverse_iterator rbegin() const { return const_reverse_iterator(end()); }
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const_reverse_iterator crbegin() const { return rbegin(); }
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reverse_iterator rend() { return reverse_iterator(begin()); }
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const_reverse_iterator rend() const { return const_reverse_iterator(begin()); }
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const_reverse_iterator crend() const { return rend(); }
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};
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template<typename T>
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class Array<T, 0>
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{
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public:
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T& operator[](size_t aIndex)
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{
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MOZ_CRASH("indexing into zero-length array");
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}
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const T& operator[](size_t aIndex) const
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{
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MOZ_CRASH("indexing into zero-length array");
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}
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};
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} /* namespace mozilla */
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#endif /* mozilla_Array_h */
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