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// Copyright 2023 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
// 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.
#ifndef SRC_DAWN_COMMON_REF_H_
#define SRC_DAWN_COMMON_REF_H_
#include <mutex>
#include <utility>
#include "dawn/common/RefBase.h"
#include "dawn/common/RefCounted.h"
namespace dawn {
template <typename T>
class WeakRef;
namespace detail {
class WeakRefSupportBase;
template <typename T>
struct RefCountedTraits {
static constexpr T* kNullValue = nullptr;
static void Reference(T* value) { value->Reference(); }
static void Release(T* value) { value->Release(); }
};
} // namespace detail
template <typename T>
class Ref : public RefBase<T*, detail::RefCountedTraits<T>> {
public:
using RefBase<T*, detail::RefCountedTraits<T>>::RefBase;
};
template <typename T>
Ref<T> AcquireRef(T* pointee) {
Ref<T> ref;
ref.Acquire(pointee);
return ref;
}
template <typename T>
struct UnwrapRef {
using type = T;
};
template <typename T>
struct UnwrapRef<Ref<T>> {
using type = T;
};
template <typename T>
struct IsRef {
static constexpr bool value = false;
};
template <typename T>
struct IsRef<Ref<T>> {
static constexpr bool value = true;
};
template <typename T, typename H>
H AbslHashValue(H h, const Ref<T>& v) {
return H::combine(std::move(h), v.Get());
}
} // namespace dawn
#endif // SRC_DAWN_COMMON_REF_H_