如何通过vector :: pointer将向量中的数据push_back? [英] How can I push_back data in a vector via a vector::pointer?

问题描述

我想使用vector :: pointer以便将数据推入其中.

I 'd like to use a vector::pointer so as to push_back data in it..

int num;
vector<int> v;
vector<int>::pointer ptr;

ptr = &v[0];

ptr->push_back(num);  // fail
ptr.push_back(num);  // fail
ptr.push_back(&num);  // fail
*ptr.push_back(num);  // fail

似乎没有任何作用..任何想法都将受到赞赏..

nothing appears to work.. any ideas would be appreciated..

推荐答案

您不能.您需要使用原始的矢量对象.

You can't. You need to use the original vector object.

如果您想要一个指向矢量的指针，则可以执行以下操作:

If you'd like to have a pointer to a vector, you can do the following:

vector<int> v;
vector<int> *pointer = &v;

v.push_back(4);
pointer->push_back(3);

作为注释，代码中vector<int>::pointer的类型应为int *.

As a comment, the type of vector<int>::pointer in your code should be int *.

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