c++中的四种cast

C++提供四种新式转换:

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1.const_cast<T> (expression) //移除常量性

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1.dynamic_cast<T> (expression) //安全的向下转型

将base class的指针转换成derived class型指针,来调用derived class中的函数

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1.reinterpret_cast<T> (expression) //低级转型(如pointer to int)

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1.static_cast<T> (expression) //强制隐式转换