[英]Vector insert() causes program to crash
This is the first part of a function I have that's causing my program to crash: 这是我所拥有的函数的第一部分导致我的程序崩溃:
vector<Student> sortGPA(vector<Student> student) {
vector<Student> sorted;
Student test = student[0];
cout << "here\n";
sorted.insert(student.begin(), student[0]);
cout << "it failed.\n";
...
It crashes right at the sorted
part because I can see "here" on the screen but not "it failed." 它在
sorted
部分崩溃,因为我可以在屏幕上看到“here”但不是“它失败了”。 The following error message comes up: 出现以下错误消息:
Debug Assertion Failed!
(a long path here...)
Expression: vector emplace iterator outside range
For more information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts.
I'm not sure what's causing the problem now, since I have a similar line of code elsewhere student.insert(student.begin() + position(temp, student), temp);
我不确定现在是什么导致了这个问题,因为我在其他地方有类似的代码行
student.insert(student.begin() + position(temp, student), temp);
that does not crash (where position
returns an int and temp
is another declaration of a struct Student). 不会崩溃(其中
position
返回int而temp
是struct Student的另一个声明)。 What can I do to resolve the problem, and how is the first insert different from the second one? 我该怎么做才能解决问题,第一个插入与第二个插入有什么不同?
It should be: 它应该是:
sorted.insert(sorted.begin(), student[0]);
You were passing the iterator from the wrong instance. 您从错误的实例传递迭代器。
When you use std::vector::insert ( iterator position, const T& x );
当你使用
std::vector::insert ( iterator position, const T& x );
, the iterator position
must point into that same vector. ,迭代器
position
必须指向同一个向量。 You're using an iterator from student
with sorted.insert
, which dies. 你正在使用来自
student
一个迭代器sorted.insert
,它会死掉。
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