27 lines
520 B
C++
27 lines
520 B
C++
#pragma once
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template <typename T>
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struct Singleton
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{
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struct object_creator
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{
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object_creator(){ Singleton<T>::instance(); }
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inline void do_nothing()const {}
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};
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static object_creator create_object;
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public:
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typedef T object_type;
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static object_type& instance()
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{
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static object_type obj;
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//据说这个do_nothing是确保create_object构造函数被调用
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//这跟模板的编译有关
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create_object.do_nothing();
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return obj;
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}
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};
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template <typename T> typename Singleton<T>::object_creator Singleton<T>::create_object;
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