c++ - 删除 vector.end() 失败

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为什么使用 vector.erase(vector.end()) 会产生一个

Segmentation fault (core dumped)

使用此代码时:

#include <iostream>
#include <vector>
using namespace std;

void printMe(vector<int>& v){ for(auto &i:v) cout<<i<<" "; cout<<"\n"; }

int main() {
    vector<int> c = { 1,2,3,4,5,6,7,8};
    printMe(c);
    c.erase(c.begin());
    printMe(c);
    c.erase(c.begin());
    printMe(c);
    // c.erase(c.end()); //will produce segmentation fault
    // printMe(c);
    return 0;
}

我对这些迭代器有点陌生，所以这让我措手不及。虽然我知道存在 vector.pop_back()。我很想知道究竟是什么原因造成的。

A link到程序。

最佳答案

vector::end() 不指向最后一个元素，它指向最后一个元素之后的元素。

引用 cplusplus.com ,

std::vector::end

Returns an iterator referring to the past-the-end element in the vector container.

The past-the-end element is the theoretical element that would follow the last element in the vector. It does not point to any element, and thus shall not be dereferenced.

Because the ranges used by functions of the standard library do not include the element pointed by their closing iterator, this function is often used in combination with vector::begin to specify a range including all the elements in the container.

因此，它没有任何东西可以 erase() 在那里，因此错误。

替换