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54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
// (C) Copyright David Abrahams 2000. Permission to copy, use, modify, sell and
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// distribute this software is granted provided this copyright notice appears
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// in all copies. This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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// The author gratefully acknowleges the support of Dragon Systems, Inc., in
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// producing this work.
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#ifndef SINGLETON_DWA051900_H_
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# define SINGLETON_DWA051900_H_
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# include "pyconfig.h"
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namespace py {
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struct Empty {};
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template <class Derived, class Base = Empty>
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struct Singleton : Base
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{
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typedef Singleton SingletonBase; // Convenience type for derived class constructors
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static Derived* singleton();
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// Pass-through constructors
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Singleton() : Base() {}
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template <class A1>
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Singleton(const A1& a1) : Base(a1) {}
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template <class A1, class A2>
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Singleton(const A1& a1, const A2& a2) : Base(a1, a2) {}
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template <class A1, class A2, class A3>
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Singleton(const A1& a1, const A2& a2, const A3& a3) : Base(a1, a2, a3) {}
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template <class A1, class A2, class A3, class A4>
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Singleton(const A1& a1, const A2& a2, const A3& a3, const A4& a4) : Base(a1, a2, a3, a4) {}
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template <class A1, class A2, class A3, class A4, class A5>
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Singleton(const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5) : Base(a1, a2, a3, a4, a5) {}
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};
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template <class Derived, class Base>
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Derived* Singleton<Derived,Base>::singleton()
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{
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static Derived x;
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return &x;
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}
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}
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#endif
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