| // Copyright 2022 The Dawn Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #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_ |