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// Copyright 2022 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_NATIVE_CACHERESULT_H_
#define SRC_DAWN_NATIVE_CACHERESULT_H_
#include <memory>
#include <utility>
#include "dawn/common/Assert.h"
#include "dawn/native/CacheKey.h"
namespace dawn::native {
template <typename T>
class CacheResult {
public:
static CacheResult CacheHit(CacheKey key, T value) {
return CacheResult(std::move(key), std::move(value), true);
}
static CacheResult CacheMiss(CacheKey key, T value) {
return CacheResult(std::move(key), std::move(value), false);
}
CacheResult() : mKey(), mValue(), mIsCached(false), mIsValid(false) {}
bool IsCached() const {
DAWN_ASSERT(mIsValid);
return mIsCached;
}
const CacheKey& GetCacheKey() const {
DAWN_ASSERT(mIsValid);
return mKey;
}
// Note: Getting mValue is always const, since mutating it would invalidate consistency with
// mKey.
const T* operator->() const {
DAWN_ASSERT(mIsValid);
return &mValue;
}
const T& operator*() const {
DAWN_ASSERT(mIsValid);
return mValue;
}
T Acquire() {
DAWN_ASSERT(mIsValid);
mIsValid = false;
return std::move(mValue);
}
private:
CacheResult(CacheKey key, T value, bool isCached)
: mKey(std::move(key)), mValue(std::move(value)), mIsCached(isCached), mIsValid(true) {}
CacheKey mKey;
T mValue;
bool mIsCached;
bool mIsValid;
};
} // namespace dawn::native
#endif // SRC_DAWN_NATIVE_CACHERESULT_H_