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