Design pattern--Singleton design pattern (c + + implementation)

1 #ifndef singletonholder_inc2 #defineSingletonholder_inc3 4template<classT>5 classSingletonholder6 {7  Public:8     Statict*Instance ()9     {Ten         if(!Pinstance_) Onepinstance_=NewT; A         returnPinstance_; -     } - Private: the Singletonholder () {}; -Singletonholder (Constsingletonholder&); -singletonholder&operator=(Constsingletonholder&); -~Singletonholder () {}; +     Statict*Pinstance_; - }; +  Atemplate<classT> att* singletonholder<t>::p instance_=0; -  -  - #endif -  -  in #ifndef INS - #defineINS singletonholder<cglobal>::instance () to #endif

Combine templates and macro definitions to make it easy to instantiate any class

Design pattern--Singleton design pattern (c + + implementation)