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// Copyright 2020 The Dawn & Tint Authors
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef SRC_DAWN_NATIVE_ENUMMASKITERATOR_H_
#define SRC_DAWN_NATIVE_ENUMMASKITERATOR_H_
#include "dawn/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:
explicit EnumMaskIterator(const T& mask)
: mBitSetIterator(std::bitset<N>(static_cast<U>(mask))) {
// If you hit this DAWN_ASSERT it means that you forgot to update EnumBitmaskSize<T>::value;
DAWN_ASSERT(U(mask) == 0 || Log2(uint64_t(U(mask))) < N);
}
class Iterator final {
public:
explicit 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 // SRC_DAWN_NATIVE_ENUMMASKITERATOR_H_