c++ - 迭代、插入和删除？

Question

梦想输出:

 /* DREAM OUTPUT:
 INT: 1
 TESTINT: 1
 TESTINT: 2
 TESTINT: 23
 TESTINT: 24
 TESTINT: 25
 TESTINT: 3
 TESTINT: 4
 TESTINT: 5
 TESTINT: 6
 INT: 23
 INT: 24
 INT: 25
 INT: 3
 INT: 4
 INT: 5
 INT: 6

问题

 ERROR 1: Not erasing the '2' causes a bizzare effect.
 ERROR 2: Erasing the '2' causes memory corruption.

代码

 #include <cstdlib>
 #include <iostream>
 #include <vector>

 int main(int argc, char* argv[])
 {
    std::vector<int> someInts;

    someInts.push_back(1);
    someInts.push_back(2);
    someInts.push_back(3);
    someInts.push_back(4);
    someInts.push_back(5);
    someInts.push_back(6);

    for(std::vector<int>::iterator currentInt = someInts.begin();
        currentInt != someInts.end(); ++currentInt)
     if(*currentInt == 2)
     {
        std::vector<int> someNewInts;

        someNewInts.push_back(23);
        someNewInts.push_back(24);
        someNewInts.push_back(25);

        someInts.insert(currentInt + 1, someNewInts.begin(), someNewInts.end());
        //someInts.erase(currentInt);

        for(std::vector<int>::iterator testInt = someInts.begin();
            testInt != someInts.end(); ++testInt)
         std::cout << "TESTINT: " << *testInt << '\n';
     }
     else
        std::cout << "INT: " << *currentInt << '\n';

    return 0;
 }

代码很容易解释，但我想知道这里发生了什么。这是一个使用 ints 的拷贝，它反射(reflect)了一个更大的项目中正在发生的事情。这让我很困惑。

Answer 1

将元素插入 vector 会导致与其关联的迭代器无效，因为 vector 可以增长并因此分配其内部存储空间。