C ++ standard Extended Application Skills

For experienced programmers, the C ++ programming language should be more familiar. Such a powerful language brings great benefits to their program development, today, we can use the C ++ standard extension method to experience the features of this language.

Today, I tried to use shared_ptr in the C ++ standard extension. I couldn't compile it on gcc4.1. I checked it online and downloaded the TR1 manual. Finally, I understand that I want to add it to # include.

 
 

  
  
#include < tr1/memory> 
  
  
#include < iostream> 
  
  
#include < string> 
  
  
#include < tr1/array> 
  
  
#include < tr1/memory> 
  
  
using namespace std;  
  
  
using std::tr1::shared_ptr;  
  
  
 
  
  
class Widget  
  
  
{  
  
  
public:  
  
  
Widget()   
  
  
{  
  
  
pstr = new string("Hello world!");  
  
  
cout < <  "Widget's construction is called" < <  endl;   
  
  
}  
  
  
Widget(const Widget& rhs) { cout < <  "Widget's copy 
construction is called" < <  endl; }  
  
  
Widget& operator=(const Widget& rhs) { return *this; }  
  
  
~Widget()   
  
  
{  
  
  
delete pstr;  
  
  
cout < <  "Destruction is called" < <  endl;   
  
  
}  
  
  
private:  
  
  
string* pstr;  
  
  
};  
  
  
int main()  
  
  
{  
  
  
auto_ptr< Widget> pInv(new Widget);  
  
  
auto_ptr< Widget> pInv2(pInv);  
  
  
shared_ptr< Widget> pInvN(new Widget);  
  
  
array< int, 5> a = {{1,2,3,4,5}};  
  
  
cout < <  a[3] < <  endl;  
  
  
return 0;  
  
  
} 
 
 

This file. Oh, maybe you are too careless! The C ++ standard expansion section mainly includes:

 
 

  
  
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 
 
 

We have seen the long-awaited regular expressions in the C ++ standard extensions!