1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 /* A compile-time constant-length array with bounds-checking assertions. */
9 #ifndef mozilla_Array_h
10 #define mozilla_Array_h
12 #include "mozilla/Assertions.h"
13 #include "mozilla/Attributes.h"
14 #include "mozilla/Move.h"
15 #include "mozilla/ReverseIterator.h"
21 template <typename T
, size_t Length
>
28 template <typename
... Args
>
29 MOZ_IMPLICIT
constexpr Array(Args
&&... aArgs
)
30 : mArr
{std::forward
<Args
>(aArgs
)...} {
31 static_assert(sizeof...(aArgs
) == Length
,
32 "The number of arguments should be equal to the template "
36 T
& operator[](size_t aIndex
) {
37 MOZ_ASSERT(aIndex
< Length
);
41 const T
& operator[](size_t aIndex
) const {
42 MOZ_ASSERT(aIndex
< Length
);
46 bool operator==(const Array
<T
, Length
>& aOther
) const {
47 for (size_t i
= 0; i
< Length
; i
++) {
48 if (mArr
[i
] != aOther
[i
]) {
56 typedef const T
* const_iterator
;
57 typedef ReverseIterator
<T
*> reverse_iterator
;
58 typedef ReverseIterator
<const T
*> const_reverse_iterator
;
60 // Methods for range-based for loops.
61 iterator
begin() { return mArr
; }
62 const_iterator
begin() const { return mArr
; }
63 const_iterator
cbegin() const { return begin(); }
64 iterator
end() { return mArr
+ Length
; }
65 const_iterator
end() const { return mArr
+ Length
; }
66 const_iterator
cend() const { return end(); }
68 // Methods for reverse iterating.
69 reverse_iterator
rbegin() { return reverse_iterator(end()); }
70 const_reverse_iterator
rbegin() const {
71 return const_reverse_iterator(end());
73 const_reverse_iterator
crbegin() const { return rbegin(); }
74 reverse_iterator
rend() { return reverse_iterator(begin()); }
75 const_reverse_iterator
rend() const {
76 return const_reverse_iterator(begin());
78 const_reverse_iterator
crend() const { return rend(); }
84 T
& operator[](size_t aIndex
) { MOZ_CRASH("indexing into zero-length array"); }
86 const T
& operator[](size_t aIndex
) const {
87 MOZ_CRASH("indexing into zero-length array");
91 } /* namespace mozilla */
93 #endif /* mozilla_Array_h */