mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-28 15:23:51 +00:00
ad6c02c994
Differential Revision: https://phabricator.services.mozilla.com/D62542 --HG-- extra : moz-landing-system : lando
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 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* 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. */
|
|
|
|
#ifndef mozilla_Array_h
|
|
#define mozilla_Array_h
|
|
|
|
#include <stddef.h>
|
|
|
|
#include <ostream>
|
|
#include <utility>
|
|
|
|
#include "mozilla/Assertions.h"
|
|
#include "mozilla/Attributes.h"
|
|
#include "mozilla/ReverseIterator.h"
|
|
|
|
namespace mozilla {
|
|
|
|
template <typename T, size_t _Length>
|
|
class Array {
|
|
T mArr[_Length];
|
|
|
|
public:
|
|
using ElementType = T;
|
|
static constexpr size_t Length = _Length;
|
|
|
|
Array() = default;
|
|
|
|
template <typename... Args>
|
|
MOZ_IMPLICIT constexpr Array(Args&&... aArgs)
|
|
: mArr{std::forward<Args>(aArgs)...} {
|
|
static_assert(sizeof...(aArgs) == Length,
|
|
"The number of arguments should be equal to the template "
|
|
"parameter Length");
|
|
}
|
|
|
|
T& operator[](size_t aIndex) {
|
|
MOZ_ASSERT(aIndex < Length);
|
|
return mArr[aIndex];
|
|
}
|
|
|
|
const T& operator[](size_t aIndex) const {
|
|
MOZ_ASSERT(aIndex < Length);
|
|
return mArr[aIndex];
|
|
}
|
|
|
|
bool operator==(const Array<T, Length>& aOther) const {
|
|
for (size_t i = 0; i < Length; i++) {
|
|
if (mArr[i] != aOther[i]) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
typedef T* iterator;
|
|
typedef const T* const_iterator;
|
|
typedef ReverseIterator<T*> reverse_iterator;
|
|
typedef ReverseIterator<const T*> const_reverse_iterator;
|
|
|
|
// Methods for range-based for loops.
|
|
iterator begin() { return mArr; }
|
|
constexpr const_iterator begin() const { return mArr; }
|
|
constexpr const_iterator cbegin() const { return begin(); }
|
|
iterator end() { return mArr + Length; }
|
|
constexpr const_iterator end() const { return mArr + Length; }
|
|
constexpr const_iterator cend() const { return end(); }
|
|
|
|
// Methods for reverse iterating.
|
|
reverse_iterator rbegin() { return reverse_iterator(end()); }
|
|
const_reverse_iterator rbegin() const {
|
|
return const_reverse_iterator(end());
|
|
}
|
|
const_reverse_iterator crbegin() const { return rbegin(); }
|
|
reverse_iterator rend() { return reverse_iterator(begin()); }
|
|
const_reverse_iterator rend() const {
|
|
return const_reverse_iterator(begin());
|
|
}
|
|
const_reverse_iterator crend() const { return rend(); }
|
|
};
|
|
|
|
template <typename T>
|
|
class Array<T, 0> {
|
|
public:
|
|
T& operator[](size_t aIndex) { MOZ_CRASH("indexing into zero-length array"); }
|
|
|
|
const T& operator[](size_t aIndex) const {
|
|
MOZ_CRASH("indexing into zero-length array");
|
|
}
|
|
};
|
|
|
|
// MOZ_DBG support
|
|
|
|
template <typename T, size_t Length>
|
|
std::ostream& operator<<(std::ostream& aOut, const Array<T, Length>& aArray) {
|
|
return aOut << MakeSpan(aArray);
|
|
}
|
|
|
|
} /* namespace mozilla */
|
|
|
|
#endif /* mozilla_Array_h */
|