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76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
// Copyright (c) 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_TASK_TEST_TASK_TRAITS_EXTENSION_H_
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#define BASE_TASK_TEST_TASK_TRAITS_EXTENSION_H_
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#include <utility>
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#include "base/task/task_traits.h"
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namespace base {
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enum class TestExtensionEnumTrait { kA, kB, kC };
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struct TestExtensionBoolTrait {};
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// Example TaskTraits extension for use in tests.
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class TestTaskTraitsExtension {
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public:
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static constexpr uint8_t kExtensionId =
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TaskTraitsExtensionStorage::kFirstEmbedderExtensionId;
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struct ValidTrait {
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ValidTrait(TestExtensionEnumTrait) {}
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ValidTrait(TestExtensionBoolTrait) {}
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};
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template <class... ArgTypes,
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class CheckArgumentsAreValid = std::enable_if_t<
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trait_helpers::AreValidTraits<ValidTrait, ArgTypes...>::value>>
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constexpr TestTaskTraitsExtension(ArgTypes... args)
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: enum_trait_(trait_helpers::GetValueFromArgList(
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trait_helpers::EnumArgGetter<TestExtensionEnumTrait,
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TestExtensionEnumTrait::kA>(),
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args...)),
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bool_trait_(trait_helpers::GetValueFromArgList(
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trait_helpers::BooleanArgGetter<TestExtensionBoolTrait>(),
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args...)) {}
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constexpr TaskTraitsExtensionStorage Serialize() const {
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return {kExtensionId, {{static_cast<uint8_t>(enum_trait_), bool_trait_}}};
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}
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static const TestTaskTraitsExtension Parse(
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const TaskTraitsExtensionStorage& extension) {
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if (extension.data[1]) {
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return TestTaskTraitsExtension(
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static_cast<TestExtensionEnumTrait>(extension.data[0]),
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TestExtensionBoolTrait());
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} else {
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return TestTaskTraitsExtension(
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static_cast<TestExtensionEnumTrait>(extension.data[0]));
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}
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}
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constexpr TestExtensionEnumTrait enum_trait() const { return enum_trait_; }
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constexpr bool bool_trait() const { return bool_trait_; }
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private:
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TestExtensionEnumTrait enum_trait_;
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bool bool_trait_;
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};
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template <class... ArgTypes,
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class = std::enable_if_t<
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trait_helpers::AreValidTraits<TestTaskTraitsExtension::ValidTrait,
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ArgTypes...>::value>>
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constexpr TaskTraitsExtensionStorage MakeTaskTraitsExtension(
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ArgTypes&&... args) {
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return TestTaskTraitsExtension(std::forward<ArgTypes>(args)...).Serialize();
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}
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} // namespace base
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#endif // BASE_TASK_TEST_TASK_TRAITS_EXTENSION_H_
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