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69 lines
2.9 KiB
C++
69 lines
2.9 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 python { namespace detail {
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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 singleton_base; // Convenience type for derived class constructors
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static Derived* instance();
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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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template <class A1, class A2, class A3, class A4, class A5, class A6>
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singleton(const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5, const A6& a6) : Base(a1, a2, a3, a4, a5, a6) {}
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template <class A1, class A2, class A3, class A4, class A5, class A6, class A7>
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singleton(const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5, const A6& a6, const A7& a7) : Base(a1, a2, a3, a4, a5, a6, a7) {}
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template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8>
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singleton(const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5, const A6& a6, const A7& a7, const A8& a8) : Base(a1, a2, a3, a4, a5, a6, a7, a8) {}
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template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9>
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singleton(const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5, const A6& a6, const A7& a7, const A8& a8, const A9& a9) : Base(a1, a2, a3, a4, a5, a6, a7, a8, a9) {}
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template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9, class A10>
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singleton(const A1& a1, const A2& a2, const A3& a3, const A4& a4, const A5& a5, const A6& a6, const A7& a7, const A8& a8, const A9& a9, const A10& a10) : Base(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10) {}
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};
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template <class Derived, class Base>
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Derived* singleton<Derived,Base>::instance()
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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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}} // namespace python::detail
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#endif
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