四种类型转换 cast

1.static_cast  

2.dynamic_cast

3.const_cast

4. reinterpret_cast

例子1：

float x;

cout<<static_cast<int>(x);

...

f(static_cast<string>("hello"));

例子2：

class Car;

class  Cabriolet:pbulic Car

{

};

class Limousine:public Car

{

};

void f(Car *cp)

{

    Cabriolet *p = dynamic_cast <Cabriolet*>(cp);

    if ( NULL != p)

    {

    }

}

例子3：

const  char *pChar1 = "Hello,microsoft visual studio  will help you ",

char * pChar2 = const_cast<char*>(pChar1);

例子4：

void * pT;

unsigned long  address= reinterpret_cast<unsigned long>(pT);