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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
//===-- MIUtilSingletonBase.h -----------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#pragma once
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namespace MI {
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// MI::ISingleton base class usage:
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//
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// class CMIDerivedClass
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// : public MI::ISingleton< CMIDerivedClass >
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// {
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// friend MI::ISingleton< CMIDerivedClass >;
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//
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// // Overridden:
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// public:
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// // From MI::ISingleton
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// bool Initialize() override;
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// bool Shutdown() override;
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// };
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//++
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//============================================================================
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// Details: Base class for the singleton pattern.
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// Gotchas: Derived class must specify MI::ISingleton<> as a friend class.
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//--
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template <typename T> class ISingleton {
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// Statics:
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public:
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// Return an instance of the derived class
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static T &Instance() {
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// This will fail if the derived class has not
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// declared itself to be a friend of MI::ISingleton
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static T instance;
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return instance;
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}
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// Overrideable:
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public:
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virtual bool Initialize() = 0;
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virtual bool Shutdown() = 0;
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//
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/* dtor */ virtual ~ISingleton() {}
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};
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} // namespace MI
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