gecko-dev/mfbt/Array.h

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/* -*- 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 "mozilla/Assertions.h"
#include "mozilla/Attributes.h"
#include <stddef.h>
namespace mozilla {
template<typename T, size_t Length>
class Array
{
T arr[Length];
public:
T& operator[](size_t i) {
MOZ_ASSERT(i < Length);
return arr[i];
}
const T& operator[](size_t i) const {
MOZ_ASSERT(i < Length);
return arr[i];
}
};
template<typename T>
class Array<T, 0>
{
public:
T& operator[](size_t i) {
MOZ_ASSUME_UNREACHABLE("indexing into zero-length array");
}
const T& operator[](size_t i) const {
MOZ_ASSUME_UNREACHABLE("indexing into zero-length array");
}
};
} /* namespace mozilla */
#endif /* mozilla_Array_h */