c++标准扩展TR1

秒速五厘米 2022-04-01 12:10 228阅读 0赞

今天实验一下TR1的shared\_ptr的使用，结果在gcc4.1上怎么也编译不过去，上网查了一下，还下载了TR1的手册。终于明白了，要在\#include中加入  
\#include <tr1/memory>

![None.gif][] \#include  < iostream >   
![None.gif][]\#include  < string >   
![None.gif][]\#include  < tr1 / array >   
![None.gif][]\#include  < tr1 / memory >   
![None.gif][] using  namespace  std;  
![None.gif][] using  std::tr1::shared\_ptr;  
![None.gif][]  
![None.gif][] class  Widget  
![ExpandedBlockStart.gif][None.gif]![ContractedBlock.gif][None.gif] ![dot.gif][None.gif] \{  
![InBlock.gif][None.gif]public:  
![InBlock.gif][None.gif] Widget()  
![ExpandedSubBlockStart.gif][None.gif]![ContractedSubBlock.gif][None.gif]![dot.gif][None.gif]\{  
![InBlock.gif][None.gif] pstr =newstring("Hello world!");  
![InBlock.gif][None.gif] cout <<"Widget's construction is called"<< endl;  
![ExpandedSubBlockEnd.gif][None.gif] \}  
![ExpandedSubBlockStart.gif][None.gif]![ContractedSubBlock.gif][None.gif] Widget(const Widget& rhs) ![dot.gif][None.gif]\{ cout <<"Widget's copy construction is called"<< endl; \}  
![ExpandedSubBlockStart.gif][None.gif]![ContractedSubBlock.gif][None.gif] Widget&operator=(const Widget& rhs) ![dot.gif][None.gif]\{ return\*this; \}  
![InBlock.gif][None.gif]~Widget()  
![ExpandedSubBlockStart.gif][None.gif]![ContractedSubBlock.gif][None.gif]![dot.gif][None.gif]\{  
![InBlock.gif][None.gif] delete pstr;  
![InBlock.gif][None.gif] cout <<"Destruction is called"<< endl;  
![ExpandedSubBlockEnd.gif][None.gif] \}  
![InBlock.gif][None.gif]  
![InBlock.gif][None.gif]private:  
![InBlock.gif][None.gif]string\* pstr;  
![ExpandedBlockEnd.gif][None.gif]\} ;  
![None.gif][]  
![None.gif][]  
![None.gif][] int  main()  
![ExpandedBlockStart.gif][None.gif]![ContractedBlock.gif][None.gif] ![dot.gif][None.gif] \{  
![InBlock.gif][None.gif] auto\_ptr<Widget> pInv(new Widget);  
![InBlock.gif][None.gif] auto\_ptr<Widget> pInv2(pInv);  
![InBlock.gif][None.gif]  
![InBlock.gif][None.gif] shared\_ptr<Widget> pInvN(new Widget);  
![ExpandedSubBlockStart.gif][None.gif]![ContractedSubBlock.gif][None.gif] array<int, 5> a =![dot.gif][None.gif]\{ ![dot.gif][None.gif]\{ 1,2,3,4,5\}\};  
![InBlock.gif][None.gif] cout << a\[3\] << endl;  
![InBlock.gif][None.gif]return0;  
![ExpandedBlockEnd.gif][None.gif]\}   
![None.gif][]

这个文件。呵呵，可能是自己太不小心了！  
这次C++要扩展的部分，根据TR1的说明主要有：

*  Reference Wrappers
 *  Shared\_ptr
 *  result\_of
 *  mem\_fn
 *  Function Object Binders
 *  Polymorphic Function Wrappers
 *  Type Traits
 *  Random Numbers
 *  Tuples
 *  Array
 *  Hash Functions
 *  Regular Expressions
 *  Complex Number Algorithms

这些部分，我们看到了期待以久的正则表达式也在这里面哦！

[None.gif]: