What are the application skills of C++ standard extension

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Today experiment C++ standard extensions in the use of shared_ptr, the results in gcc4.1 how also compiled in the past, check the Internet, but also downloaded the TR1 manual. Finally, I understand that you have 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. Hehe, maybe I was too careless! The C++ standard extension, according to TR1, 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

These C++ standard extensions, we see the long-awaited regular expressions are also here Oh!

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