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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/Move.h"
namespace mozilla {
/**
* EnumeratedArray is a fixed-size array container for use when an
* array is indexed by a specific 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:
*
* enum class AnimalSpecies {
* Cow,
* Sheep,
* Count
* };
*
* EnumeratedArray<AnimalSpecies, AnimalSpecies::Count, int> headCount;
*
* headCount[AnimalSpecies::Cow] = 17;
* headCount[AnimalSpecies::Sheep] = 30;
*
*/
template<typename IndexType,
IndexType SizeAsEnumValue,
typename ValueType>
class EnumeratedArray
{
public:
static const size_t kSize = size_t(SizeAsEnumValue);
private:
typedef Array<ValueType, kSize> ArrayType;
ArrayType mArray;
public:
EnumeratedArray() {}
template <typename... Args>
MOZ_IMPLICIT EnumeratedArray(Args&&... aArgs)
: mArray{mozilla::Forward<Args>(aArgs)...}
{}
explicit EnumeratedArray(const EnumeratedArray& aOther)
{
for (size_t i = 0; i < kSize; i++) {
mArray[i] = aOther.mArray[i];
}
}
EnumeratedArray(EnumeratedArray&& aOther)
{
for (size_t i = 0; i < kSize; i++) {
mArray[i] = Move(aOther.mArray[i]);
}
}
ValueType& operator[](IndexType aIndex)
{
return mArray[size_t(aIndex)];
}
const ValueType& operator[](IndexType aIndex) const
{
return mArray[size_t(aIndex)];
}
typedef typename ArrayType::iterator iterator;
typedef typename ArrayType::const_iterator const_iterator;
typedef typename ArrayType::reverse_iterator reverse_iterator;
typedef typename ArrayType::const_reverse_iterator const_reverse_iterator;
// Methods for range-based for loops.
iterator begin() { return mArray.begin(); }
const_iterator begin() const { return mArray.begin(); }
const_iterator cbegin() const { return mArray.cbegin(); }
iterator end() { return mArray.end(); }
const_iterator end() const { return mArray.end(); }
const_iterator cend() const { return mArray.cend(); }
// Methods for reverse iterating.
reverse_iterator rbegin() { return mArray.rbegin(); }
const_reverse_iterator rbegin() const { return mArray.rbegin(); }
const_reverse_iterator crbegin() const { return mArray.crbegin(); }
reverse_iterator rend() { return mArray.rend(); }
const_reverse_iterator rend() const { return mArray.rend(); }
const_reverse_iterator crend() const { return mArray.crend(); }
};
} // namespace mozilla
#endif // mozilla_EnumeratedArray_h
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