引用std :: vector的派生类指针作为函数的输入参数 [英] reference to a std::vector of derived class pointers as input parameter to a function

问题描述

首先我要道歉，如果有另一个问题，像这一个，我没有找到它。我一直在尝试，但因为问题是相当具体的我找不到一个。

First of all I'd like to apologize if there's another question like this one and I didn't find it. I've been trying but since the problem is quite specific I couldn't find one.

现在，问题。我有一个Base类和一个Derived类（比如BNode和DNode），我有一个std :: vector的BNode *。我还有一个函数接收这些指针的向量的引用。我尝试传递一个std :: vector的指针到派生对象作为参数到此函数的时遇到麻烦：

Now, the problem. I have a Base class and a Derived class (say BNode and DNode ), and I have a std::vector of BNode*. I have also a function which receives a reference to a vector of these pointers. I'm having trouble when trying to pass a std::vector of pointers to derived objects as a parameter to this function:

class BNode
{
};

class DNode : public BNode
{
};

class Other
{
function(std::vector<BNode*>& inputVector) { } 
}

当试图传递一个指针的向量到派生类，我从VS接收的错误是：

When trying to pass a vector of pointers to the derived class, the error I'm receiving from VS is:

1> error C2664: 'Other::function' : cannot convert parameter 1 'std::vector<T>' to 'std::vector<T> &'
1>        with
1>        [
1>            T=DNode *
1>        ]
1>        and
1>        [
1>            T=BNode *
1>        ]

先感谢。

推荐答案

这是因为vector< Bnode *>和向量& Dnode *>没有任何父子关系。它们是不同的对象。

This is because vector< Bnode* > and vector< Dnode* > do not have any parent-child relation. They are different objects.

我猜你已经创建了一个像std :: vector< DNode *> dnodevec;
相反，你可以创建std :: vector< BNode *> dnodevec;作为基类指针的向量，您可以安全地在向量中插入任何DNode类型指针。

I guess you have created a vector like std::vector< DNode* > dnodevec; Instead you can create std::vector< BNode* > dnodevec; Being the vector of base class pointers you can safely insert any DNode type pointer in the vector.

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