c++中的四種cast

C++提供四種新式轉換:

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1.const_cast<T> (expression) //移除常量性

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1.dynamic_cast<T> (expression) //安全的向下轉型

將base class的指針轉換成derived class型指針,來調用derived class中的函數

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1.reinterpret_cast<T> (expression) //低級轉型(如pointer to int)

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1.static_cast<T> (expression) //強制隱式轉換