mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-26 10:10:31 +00:00
77 lines
2.0 KiB
C++
77 lines
2.0 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/. */
|
|
|
|
/* EnumeratedArray is like Array, but indexed by a typed enum. */
|
|
|
|
#ifndef mozilla_EnumeratedArray_h
|
|
#define mozilla_EnumeratedArray_h
|
|
|
|
#include "mozilla/Array.h"
|
|
#include "mozilla/TypedEnum.h"
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* EnumeratedArray is a fixed-size array container for use when an
|
|
* array is indexed by a specific enum class, as currently implemented
|
|
* by MOZ_BEGIN_ENUM_CLASS.
|
|
*
|
|
* This provides type safety by guarding at compile time against accidentally
|
|
* indexing such arrays with unrelated values. This also removes the need
|
|
* for manual casting when using a typed enum value to index arrays.
|
|
*
|
|
* Aside from the typing of indices, EnumeratedArray is similar to Array.
|
|
*
|
|
* Example:
|
|
*
|
|
* MOZ_BEGIN_ENUM_CLASS(AnimalSpecies)
|
|
* Cow,
|
|
* Sheep,
|
|
* Count
|
|
* MOZ_END_ENUM_CLASS(AnimalSpecies)
|
|
*
|
|
* EnumeratedArray<AnimalSpecies, AnimalSpecies::Count, int> headCount;
|
|
*
|
|
* headCount[AnimalSpecies::Cow] = 17;
|
|
* headCount[AnimalSpecies::Sheep] = 30;
|
|
*
|
|
*/
|
|
template<typename IndexType,
|
|
MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(IndexType) SizeAsEnumValue,
|
|
typename ValueType>
|
|
class EnumeratedArray
|
|
{
|
|
public:
|
|
static const size_t kSize = size_t(SizeAsEnumValue);
|
|
|
|
private:
|
|
Array<ValueType, kSize> mArray;
|
|
|
|
public:
|
|
EnumeratedArray() {}
|
|
|
|
explicit EnumeratedArray(const EnumeratedArray& aOther)
|
|
{
|
|
for (size_t i = 0; i < kSize; i++) {
|
|
mArray[i] = aOther.mArray[i];
|
|
}
|
|
}
|
|
|
|
ValueType& operator[](IndexType aIndex)
|
|
{
|
|
return mArray[size_t(aIndex)];
|
|
}
|
|
|
|
const ValueType& operator[](IndexType aIndex) const
|
|
{
|
|
return mArray[size_t(aIndex)];
|
|
}
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_EnumeratedArray_h
|