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106 lines
2.9 KiB
C++
106 lines
2.9 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 <stddef.h>
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#include <iterator>
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#include <ostream>
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#include <utility>
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#include "mozilla/Assertions.h"
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#include "mozilla/Attributes.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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T mArr[_Length];
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public:
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using ElementType = T;
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static constexpr size_t Length = _Length;
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Array() = default;
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template <typename... Args>
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MOZ_IMPLICIT constexpr Array(Args&&... aArgs)
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: mArr{std::forward<Args>(aArgs)...} {
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static_assert(sizeof...(aArgs) == Length,
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"The number of arguments should be equal to the template "
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"parameter Length");
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}
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T& operator[](size_t aIndex) {
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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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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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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 std::reverse_iterator<T*> reverse_iterator;
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typedef std::reverse_iterator<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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constexpr const_iterator begin() const { return mArr; }
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constexpr const_iterator cbegin() const { return begin(); }
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iterator end() { return mArr + Length; }
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constexpr const_iterator end() const { return mArr + Length; }
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constexpr 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 {
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return const_reverse_iterator(end());
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}
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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 {
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return const_reverse_iterator(begin());
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}
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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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public:
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T& operator[](size_t aIndex) { MOZ_CRASH("indexing into zero-length array"); }
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const T& operator[](size_t aIndex) const {
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MOZ_CRASH("indexing into zero-length array");
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}
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};
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// MOZ_DBG support
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template <typename T, size_t Length>
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std::ostream& operator<<(std::ostream& aOut, const Array<T, Length>& aArray) {
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return aOut << Span(aArray);
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}
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} /* namespace mozilla */
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#endif /* mozilla_Array_h */
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