src/dawn/common/CoreFoundationRef.h

// 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
// 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_COREFOUNDATIONREF_H_
#define SRC_DAWN_COMMON_COREFOUNDATIONREF_H_

#include <CoreFoundation/CoreFoundation.h>

#include "dawn/common/RefBase.h"

namespace dawn {

template <typename T>
struct CoreFoundationRefTraits {
    static constexpr T kNullValue = nullptr;
    static void AddRef(T value) { CFRetain(value); }
    static void Release(T value) { CFRelease(value); }
};

template <typename T>
class CFRef : public RefBase<T, CoreFoundationRefTraits<T>> {
  public:
    using RefBase<T, CoreFoundationRefTraits<T>>::RefBase;
};

template <typename T>
CFRef<T> AcquireCFRef(T pointee) {
    CFRef<T> ref;
    ref.Acquire(pointee);
    return ref;
}

}  // namespace dawn

#endif  // SRC_DAWN_COMMON_COREFOUNDATIONREF_H_