如何从给定类型C ++的向量返回元素？ [英] How to return elements from a vector with a given type C++?

问题描述

i have a class EscapeRoomWrapper now i made another two classes which are the "sons" of this class ScaryRoom and KidsRoom , which means ScaryRoom is a EscapeRoomWrapper and KidsRoom is a EscapeRoomWrapper , now for each one of those classes i wrote functions ..

i am working now from another class which is company , and in this class i added a set of all the rooms (EscapeRoomWrapper,ScaryRoom,KidsRoom) now i want to write a function in class company that i give it a type of room and it should returns for me all of the rooms from that type that exists in the victor of all rooms , then i thougt about using typeid but then the professer banned us from using it , my last idea is to use cast dynamic 
<pre>any ideas of how i can do this function ?? <pre>std::vector<EscapeRoomWrapper*>& getAllRoomsByType(RoomType type) const

。



我尝试过：



public：

//这里的功能

};



private：

int a

public：

// y房间的功能

};



class：public {

.

What I have tried:

public:
// functions here
};

private:
int a
public:
// functions for y room
};

class : public {

推荐答案

如果EscapeRoomWrapper有一个RoomType成员，那么它知道每个派生对象的类型是什么，它可以使用那与dynamic_cast。如果每个派生的被调用方法相同，那么您将不需要进行强制转换。

If EscapeRoomWrapper has a RoomType member then it knows what type each derived object is and it can use that with dynamic_cast. If the called methods are the same for each derivation then you won't need to cast.

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