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ash / public / cpp / scoped_singleton_resetter_for_test.h [blame]
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_PUBLIC_CPP_SCOPED_SINGLETON_RESETTER_FOR_TEST_H_
#define ASH_PUBLIC_CPP_SCOPED_SINGLETON_RESETTER_FOR_TEST_H_
#include "base/memory/raw_ptr.h"
namespace ash {
// Helper class to reset singleton instance in constructor and restore it in
// destructor so that tests could create its own instance.
template <typename T>
class ASH_PUBLIC_EXPORT ScopedSingletonResetterForTest {
public:
ScopedSingletonResetterForTest() : instance_(GetGlobalInstanceHolder()) {
GetGlobalInstanceHolder() = nullptr;
}
~ScopedSingletonResetterForTest() { GetGlobalInstanceHolder() = instance_; }
private:
// Override this method to provide pointer holding singleton instance.
T*& GetGlobalInstanceHolder();
const raw_ptr<T> instance_;
};
} // namespace ash
#endif // ASH_PUBLIC_CPP_SCOPED_SINGLETON_RESETTER_FOR_TEST_H_