C++ 重载 >> for ifstream on mac pointer being freed is not allocated

Question

我正在尝试以下代码，但失败并出现以下错误:

malloc: *** error for object 0x10000d8c0: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Program received signal:  “SIGABRT”.

这是文件 input.txt 的内容:它具有完全权限并且文件已在调试器中成功打开。请帮忙。

Jacob Anderson
Michael Thomson
Joshua Smith
Mathew Matheis
Ethan Evans 
Emily Drake
Emma Patterson
Madison McPhee
Hannah Briens
Ashley Schmidt

.

#include <iostream>
#include <vector>
#include <functional>
#include <algorithm>
#include <list>
#include <fstream>
#include <string>

#include <stdio.h>

using namespace std;

struct DataType  {
    string lastname;              // (Key) Student's Last Name
    string firstname;     // Student's First Name

    string getKey () const
    { return lastname; }   // Returns the key field
};

ostream& operator << (ostream& os, DataType myData) {
    os<<myData.firstname<< " "<<myData.lastname;
    return os;
}

bool operator < (DataType lhs, DataType rhs) {
    if (lhs.firstname < rhs.firstname)
        return true;
    return false;
}

int main() {
 ifstream studentFile ("input.txt");  // Student file
    list <DataType> students;            // Students
    DataType currStudent;              // One Student (has firstname,lastname)

    if (! studentFile.is_open())
    {
        return -1;
    }
    while (studentFile >> currStudent.firstname >> currStudent.lastname) {
        students.push_back(currStudent);
    }

    list<DataType>::iterator i = students.begin();
    while (i != students.end()) {
        cout << *i << endl ;
        ++i;
    }    
}

Answer 1

我看不出代码有任何明显的错误。正在进行一些不必要的复制(各种运算符应该采用 DataType &(实际上，最好是 const DataType &)而不是像现在这样的对象，以防止对象被复制. 我还会删除 stdio.h 的包含，因为您在此处显示的代码中不需要它。

不过，以上都不会触发您看到的错误。您是否还有任何其他代码没有向我们展示？