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/*
* Copyright (C) 2025 Igalia S.L.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <wtf/OptionSet.h>
#include <wtf/Vector.h>
namespace WTF {
template<typename E> class OptionCountedSet {
public:
constexpr bool isEmpty() const { return m_optionSet.isEmpty(); }
constexpr bool contains(E option) const { return m_optionSet.contains(option); }
constexpr void add(E option)
{
auto i = index(option);
const auto currentSize = m_counts.size();
const auto newSize = i + 1;
if (currentSize < newSize)
m_counts.insertFill(currentSize, 0, newSize - currentSize);
m_counts[i] += 1;
if (m_counts[i] == 1)
m_optionSet.add(option);
}
constexpr void remove(E option)
{
if (!m_optionSet.contains(option))
return;
auto i = index(option);
ASSERT(i < m_counts.size());
ASSERT(m_counts[i] > 0);
m_counts[i] -= 1;
if (!m_counts[i])
m_optionSet.remove(option);
}
constexpr void add(OptionSet<E> optionSet)
{
for (auto option : optionSet)
add(option);
}
constexpr void remove(OptionSet<E> optionSet)
{
for (auto option : optionSet)
remove(option);
}
private:
static constexpr size_t index(E option)
{
auto value = static_cast<std::underlying_type_t<E>>(option);
return value ? std::countr_zero(value) : 0;
}
OptionSet<E> m_optionSet;
Vector<unsigned, 8> m_counts;
};
} // namespace WTF
using WTF::OptionCountedSet;
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