获取插入向量的对象的索引 [英] Get index of object inserted into a vector

问题描述

如何获得对象实际插入的位置?

How can I get the position where my object was actually inserted?

#include <vector>
using namespace std;

vector<SomeClass> list;
SomeClass object;
list.push_back(object);

list[...].method(); // I do not have the key

不幸的是 push_back 没有返回任何东西，因为它的返回类型是 void.

Unfortunately push_back does not return anything since its return type is void.

推荐答案

如果 v 是你的向量，下面会给你位置(即索引):

If v is your vector, the following will give you the position (that is, the index):

v.push_back(object);
size_t pos = v.size() - 1;

或者你可以在调用push_back()之前查看size().那么你就不需要减一了.

Or you can look at the size() before calling push_back(). Then you won't need to subtract one.

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