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82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* EnumeratedArray is like Array, but indexed by a typed enum. */
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#ifndef mozilla_EnumeratedArray_h
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#define mozilla_EnumeratedArray_h
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#include "mozilla/Array.h"
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#include "mozilla/TypedEnum.h"
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namespace mozilla {
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/**
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* EnumeratedArray is a fixed-size array container for use when an
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* array is indexed by a specific enum class, as currently implemented
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* by MOZ_BEGIN_ENUM_CLASS.
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*
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* This provides type safety by guarding at compile time against accidentally
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* indexing such arrays with unrelated values. This also removes the need
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* for manual casting when using a typed enum value to index arrays.
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*
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* Aside from the typing of indices, EnumeratedArray is similar to Array.
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*
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* Example:
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*
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* MOZ_BEGIN_ENUM_CLASS(AnimalSpecies)
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* Cow,
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* Sheep,
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* Count
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* MOZ_END_ENUM_CLASS(AnimalSpecies)
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*
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* EnumeratedArray<AnimalSpecies, AnimalSpecies::Count, int> headCount;
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*
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* headCount[AnimalSpecies::Cow] = 17;
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* headCount[AnimalSpecies::Sheep] = 30;
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*
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*/
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template<typename IndexType,
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MOZ_TEMPLATE_ENUM_CLASS_ENUM_TYPE(IndexType) SizeAsEnumValue,
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typename ValueType>
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class EnumeratedArray
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{
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public:
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static const size_t Size = size_t(SizeAsEnumValue);
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private:
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Array<ValueType, Size> mArray;
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public:
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EnumeratedArray() {}
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explicit EnumeratedArray(const EnumeratedArray& aOther)
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{
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for (size_t i = 0; i < Size; i++)
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mArray[i] = aOther.mArray[i];
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}
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explicit EnumeratedArray(const ValueType (&aOther)[Size])
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{
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for (size_t i = 0; i < Size; i++)
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mArray[i] = aOther[i];
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}
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ValueType& operator[](IndexType aIndex)
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{
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return mArray[size_t(aIndex)];
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}
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const ValueType& operator[](IndexType aIndex) const
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{
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return mArray[size_t(aIndex)];
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}
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};
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} // namespace mozilla
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#endif // mozilla_EnumeratedArray_h
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