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