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// Copyright 2020 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef DAWNNATIVE_ENUMMASKITERATOR_H_
#define DAWNNATIVE_ENUMMASKITERATOR_H_
#include "common/BitSetIterator.h"
#include "dawn_native/EnumClassBitmasks.h"
namespace dawn_native {
template <typename T>
class EnumMaskIterator final {
static constexpr size_t N = EnumBitmaskSize<T>::value;
static_assert(N > 0, "");
using U = std::underlying_type_t<T>;
public:
EnumMaskIterator(const T& mask) : mBitSetIterator(std::bitset<N>(static_cast<U>(mask))) {
// If you hit this ASSERT it means that you forgot to update EnumBitmaskSize<T>::value;
ASSERT(U(mask) == 0 || Log2(uint64_t(U(mask))) < N);
}
class Iterator final {
public:
Iterator(const typename BitSetIterator<N, U>::Iterator& iter) : mIter(iter) {
}
Iterator& operator++() {
++mIter;
return *this;
}
bool operator==(const Iterator& other) const {
return mIter == other.mIter;
}
bool operator!=(const Iterator& other) const {
return mIter != other.mIter;
}
T operator*() const {
U value = *mIter;
return static_cast<T>(U(1) << value);
}
private:
typename BitSetIterator<N, U>::Iterator mIter;
};
Iterator begin() const {
return Iterator(mBitSetIterator.begin());
}
Iterator end() const {
return Iterator(mBitSetIterator.end());
}
private:
BitSetIterator<N, U> mBitSetIterator;
};
template <typename T>
EnumMaskIterator<T> IterateEnumMask(const T& mask) {
return EnumMaskIterator<T>(mask);
}
} // namespace dawn_native
#endif // DAWNNATIVE_ENUMMASKITERATOR_H_