Mathias Froehlich
80274596df
This removes the other still present dependency on osg in the future sgcore library. It also remove the need for the NO_OPENSCENEGRAPH_INTERFACE compile time definition.
60 lines
1.1 KiB
C++
60 lines
1.1 KiB
C++
#ifndef SIMGEAR_SINGLETON_HXX
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#define SIMGEAR_SINGLETON_HXX 1
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#include "singleton.hpp"
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#include "SGReferenced.hxx"
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#include "SGSharedPtr.hxx"
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namespace simgear
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{
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/**
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* Class that supplies the address of a singleton instance. This class
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* can be inherited by its Class argument in order to support the
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* instance() method in that class.
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*/
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template <typename Class>
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class Singleton
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{
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protected:
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Singleton() {}
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public:
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static Class* instance()
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{
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Class& singleton
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= boost::details::pool::singleton_default<Class>::instance();
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return &singleton;
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}
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};
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template <typename RefClass>
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class SingletonRefPtr
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{
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public:
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SingletonRefPtr()
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{
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ptr = new RefClass;
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}
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static RefClass* instance()
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{
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SingletonRefPtr& singleton
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= boost::details::pool::singleton_default<SingletonRefPtr>::instance();
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return singleton.ptr.get();
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}
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private:
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SGSharedPtr<RefClass> ptr;
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};
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template <typename RefClass>
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class ReferencedSingleton : public virtual SGReferenced
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{
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public:
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static RefClass* instance()
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{
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return SingletonRefPtr<RefClass>::instance();
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}
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};
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}
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#endif
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