Mon, 07 Mar 2011 06:28:00 GMT

C++有四�U�类型�{换操作符�Q�static_cast、const_cast、dynamic_cast、reinterpret_cast�?div>1>. static_cast普通�{换，如double转int�Q?/div>

1 double a = 10;
2 int b = static_cast<int>(a);

2>. const_cast改变const或者volatile属�?

1 const char* szA = "test";
2 char* szB = const_cast<char*>(szA);

3>. dynamic_cast把指向基�cȝ��指针或引用�{换成指向�z��c�L��者基�cȝ��兄弟�cȝ��指针或引用：

 1 class Base
 2 {
 3 public:
 4     virtual void test(){} //基类必须有虚函数
 5 };
 6 
 7 class Child : public Base
 8 {
 9 public:
10     void print(){ cout << "child::base" << endl; }
11 };
12 
13 Base* pBase = new Base();
14 Child* pChild = dynamic_cast<Child*>(pBase);
15 pChild->print();

4>. reinterpret_cast用来在函数指针之间进行类型�{�?/div>

1 typedef void (*FuncPtr)();
2 FuncPtr funcPtrArray[10];
3 int doSomeing(){return 0;}
4 
5 funcPtrArray[0] = reinterpret_cast<FuncPtr>(&doSomeing);

郭小�?/a> 2011-03-07 14:28 发表评论

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