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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
// This is a cut down version of base/feature_list.h.
// This just returns the default state for a feature.
#ifndef BASE_FEATURE_LIST_H_
#define BASE_FEATURE_LIST_H_
#include "base/macros.h"
namespace base {
// Specifies whether a given feature is enabled or disabled by default.
enum FeatureState {
FEATURE_DISABLED_BY_DEFAULT,
FEATURE_ENABLED_BY_DEFAULT,
};
// The Feature struct is used to define the default state for a feature. See
// comment below for more details. There must only ever be one struct instance
// for a given feature name - generally defined as a constant global variable or
// file static. It should never be used as a constexpr as it breaks
// pointer-based identity lookup.
struct BASE_EXPORT Feature {
// The name of the feature. This should be unique to each feature and is used
// for enabling/disabling features via command line flags and experiments.
// It is strongly recommended to use CamelCase style for feature names, e.g.
// "MyGreatFeature".
const char* const name;
// The default state (i.e. enabled or disabled) for this feature.
const FeatureState default_state;
};
class BASE_EXPORT FeatureList {
public:
static bool IsEnabled(const Feature& feature) {
return feature.default_state == FEATURE_ENABLED_BY_DEFAULT;
}
static FeatureList* GetInstance() { return nullptr; }
DISALLOW_COPY_AND_ASSIGN(FeatureList);
};
} // namespace base
#endif // BASE_FEATURE_LIST_H_