1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/Array.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,51 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=8 sts=2 et sw=2 tw=80: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +/* A compile-time constant-length array with bounds-checking assertions. */
1.11 +
1.12 +#ifndef mozilla_Array_h
1.13 +#define mozilla_Array_h
1.14 +
1.15 +#include "mozilla/Assertions.h"
1.16 +#include "mozilla/Attributes.h"
1.17 +
1.18 +#include <stddef.h>
1.19 +
1.20 +namespace mozilla {
1.21 +
1.22 +template<typename T, size_t Length>
1.23 +class Array
1.24 +{
1.25 + T arr[Length];
1.26 +
1.27 + public:
1.28 + T& operator[](size_t i) {
1.29 + MOZ_ASSERT(i < Length);
1.30 + return arr[i];
1.31 + }
1.32 +
1.33 + const T& operator[](size_t i) const {
1.34 + MOZ_ASSERT(i < Length);
1.35 + return arr[i];
1.36 + }
1.37 +};
1.38 +
1.39 +template<typename T>
1.40 +class Array<T, 0>
1.41 +{
1.42 + public:
1.43 + T& operator[](size_t i) {
1.44 + MOZ_ASSUME_UNREACHABLE("indexing into zero-length array");
1.45 + }
1.46 +
1.47 + const T& operator[](size_t i) const {
1.48 + MOZ_ASSUME_UNREACHABLE("indexing into zero-length array");
1.49 + }
1.50 +};
1.51 +
1.52 +} /* namespace mozilla */
1.53 +
1.54 +#endif /* mozilla_Array_h */
