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1b4da5d28f
Bug: dawn:1480 Change-Id: I77facc854ce9d5fe41c2332236113f266178470a Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/94660 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: Loko Kung <lokokung@google.com> Commit-Queue: Austin Eng <enga@chromium.org>
78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
// Copyright 2022 The Dawn Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_DAWN_NATIVE_CACHERESULT_H_
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#define SRC_DAWN_NATIVE_CACHERESULT_H_
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#include <memory>
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#include <utility>
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#include "dawn/common/Assert.h"
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#include "dawn/native/CacheKey.h"
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namespace dawn::native {
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template <typename T>
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class CacheResult {
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public:
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static CacheResult CacheHit(CacheKey key, T value) {
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return CacheResult(std::move(key), std::move(value), true);
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}
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static CacheResult CacheMiss(CacheKey key, T value) {
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return CacheResult(std::move(key), std::move(value), false);
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}
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CacheResult() : mKey(), mValue(), mIsCached(false), mIsValid(false) {}
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bool IsCached() const {
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ASSERT(mIsValid);
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return mIsCached;
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}
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const CacheKey& GetCacheKey() const {
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ASSERT(mIsValid);
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return mKey;
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}
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// Note: Getting mValue is always const, since mutating it would invalidate consistency with
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// mKey.
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const T* operator->() const {
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ASSERT(mIsValid);
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return &mValue;
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}
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const T& operator*() const {
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ASSERT(mIsValid);
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return mValue;
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}
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T Acquire() {
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ASSERT(mIsValid);
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mIsValid = false;
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return std::move(mValue);
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}
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private:
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CacheResult(CacheKey key, T value, bool isCached)
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: mKey(std::move(key)), mValue(std::move(value)), mIsCached(isCached), mIsValid(true) {}
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CacheKey mKey;
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T mValue;
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bool mIsCached;
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bool mIsValid;
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};
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} // namespace dawn::native
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#endif // SRC_DAWN_NATIVE_CACHERESULT_H_
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