Mario Sanchez Prada
f4c7bdda37
See the following PSA in the chromium-dev mailing list for more information and links to the original discussion, the design document and the metabug: https://groups.google.com/a/chromium.org/g/chromium-dev/c/EIuQCy9sVfw/m/Net3FPz6AwAJ Resolves https://github.com/brave/brave-browser/issues/21608
60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/* Copyright (c) 2021 The Brave Authors. All rights reserved.
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef BRAVE_CHROMIUM_SRC_BASE_FEATURE_OVERRIDE_H_
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#define BRAVE_CHROMIUM_SRC_BASE_FEATURE_OVERRIDE_H_
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#include <functional>
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#include <initializer_list>
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#include <utility>
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#include "base/feature_list.h"
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// Helpers to override base::Feature::default_state without patches.
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//
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// Usage:
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// 1. Create chromium_src/.../features.cc override for a file that contains
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// features to override.
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// 2. #include "base/feature_override.h"
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// 3. Use OVERRIDE_FEATURE_DEFAULT_STATES macro:
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//
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// OVERRIDE_FEATURE_DEFAULT_STATES({{
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// {kUpstreamFeature, base::FEATURE_ENABLED_BY_DEFAULT},
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// #if BUILDFLAG(IS_ANDROID)
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// {kAnotherUpstreamFeature, base::FEATURE_DISABLED_BY_DEFAULT},
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// #endif
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// }});
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namespace base {
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namespace internal {
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// Perform base::Feature duplicates check and fills overriden states into a
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// map that is used at runtime to get an override if available.
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class BASE_EXPORT FeatureDefaultStateOverrider {
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public:
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using FeatureOverrideInfo =
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std::pair<std::reference_wrapper<const Feature>, FeatureState>;
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FeatureDefaultStateOverrider(
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std::initializer_list<FeatureOverrideInfo> overrides);
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};
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} // namespace internal
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} // namespace base
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// Feature override uses global constructors, we disable `global-constructors`
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// warning inside this macro to instantiate the overrider without warnings.
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// clang-format off
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#define OVERRIDE_FEATURE_DEFAULT_STATES(...) \
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_Pragma("clang diagnostic push") \
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_Pragma("clang diagnostic ignored \"-Wglobal-constructors\"") \
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static const ::base::internal::FeatureDefaultStateOverrider \
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g_feature_default_state_overrider __VA_ARGS__; \
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_Pragma("clang diagnostic pop") \
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static_assert(true, "") /* for a semicolon requirement */
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// clang-format on
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#endif // BRAVE_CHROMIUM_SRC_BASE_FEATURE_OVERRIDE_H_
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