ITK
6.0.0
Insight Toolkit
ITK
Modules
Core
Common
include
itkSingletonMacro.h
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/*=========================================================================
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*
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* Copyright NumFOCUS
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0.txt
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*=========================================================================*/
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#ifndef itkSingletonMacro_h
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#define itkSingletonMacro_h
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#define itkInitGlobalsMacro(VarName) \
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{ \
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[[maybe_unused]] static auto * staticGlobals = Get##VarName##Pointer(); \
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} \
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ITK_MACROEND_NOOP_STATEMENT
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#define itkGetGlobalDeclarationMacro(Type, VarName) static Type * Get##VarName##Pointer()
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#define itkGetGlobalSimpleMacro(Class, Type, Name) itkGetGlobalInitializeMacro(Class, Type, Name, Class, (void)0)
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#define itkGetGlobalValueMacro(Class, Type, Name, Value) \
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itkGetGlobalInitializeMacro(Class, Type, Name, Name, *m_##Name = Value)
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#define itkGetGlobalInitializeMacro(Class, Type, VarName, SingletonName, Init) \
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Type * Class::Get##VarName##Pointer() \
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{ \
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if (m_##VarName == nullptr) \
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{ \
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const auto deleteLambda = []() { \
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delete m_##VarName; \
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m_##VarName = nullptr; \
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}; \
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auto * old_instance = SingletonIndex::GetInstance()->GetGlobalInstance<Type>(#SingletonName); \
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m_##VarName = Singleton<Type>(#SingletonName, deleteLambda); \
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if (old_instance == nullptr) \
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{ \
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Init; \
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} \
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} \
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return m_##VarName; \
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} \
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ITK_MACROEND_NOOP_STATEMENT
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#endif
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