当我运行程序时，一切都按预期工作，直到LList类的析构函数。在显示delete current;的行上，我得到以下错误：
BlankConsoleLab.exe has triggered a breakpoint.
我一直在努力解决这个问题很长时间了。如果有人能指出我在这里做错了什么，我将不胜感激。
下面是我的程序代码。谢谢
链表类
class LList
{
private:
Node* head;
Node* tail;
int size = 0;
public:
LList()
{
head = nullptr;
tail = nullptr;
size = 0;
}
LList(Node* h, Node* t)
{
this->head = h;
this->tail = t;
}
~LList()
{
Node* current = head;
while (current != nullptr) {
Node* next = current->m_next;
delete current;
current = next;
}
}
void print()
{
//temporary node pointer to traverse through the linked list
Node* temp = head;
cout << endl << "<MY LINKED LIST>n";
while (temp != nullptr)
{
cout << temp->m_data.firstName << " ";
cout << temp->m_data.lastName << " ";
cout << temp->m_data.hrWage << " ";
cout << temp->m_data.hrWork << " " << endl;
temp = temp->m_next;
}
cout << endl;
}
void removeFirst()
{
//case 1: linked list is empty (never enters loop)
//case 2: linked list is not empty
if (head != nullptr)
{
Node* temp = head;
head = head->m_next;
delete temp;
//decrease size tracker of the linked list
size--;
}
}
void removeLast()
{
//case 1: linked list is empty (never enters loop)
//case 2: linked list has one node
if (head->m_next == nullptr)
{
removeFirst();
}
//case 3: linked list has more than one node
else if (head != nullptr)
{
Node* cur = head;
Node* prev = nullptr;
while (cur->m_next != nullptr)
{
prev = cur;
cur = cur->m_next;
}
tail = prev;
tail->m_next = nullptr;
delete cur;
//decrease size tracker of the linked list
size--;
}
}
//void removeAt(int pos)
//{
// //Case 1: input is invalid (less than 1 or greater than size)
// if (pos < 1 && pos > size)
// {
// return;
// }
// //Case 2: input is position 1
// else if (pos == 1)
// {
// removeFirst();
// }
// //Case 3: input is the last position (input equals size)
// else if (pos == size)
// {
// removeLast();
// }
// //Case 4: input is valid, and not 1 or last position (greater than 1 and less than size)
// else if (head != nullptr)
// {
// Node* cur = head;
// Node* prev = nullptr;
// for (int i = 1; i < pos; i++)
// {
// prev = cur;
// cur = cur->m_next;
// }
// prev->m_next = cur->m_next;
// delete cur;
// size--;
// }
//}
Node* swap(Node* lh, Node* rh)
{
Node* temp = rh->m_next;
rh->m_next = lh;
lh->m_next = temp;
return rh;
}
void readBin()
{
ifstream file;
file.open("C:\Users\there\source\repos\cst126-lab9-JEmersonLawrance\BlankConsoleLab\Employee Data.bin", ios::binary);
if (file)
{
Node* cur = head;
Node* prev = nullptr;
for (int i = 0; i < 4; i++)
{
file.read((char*)&cur->m_data.firstName, sizeof(cur->m_data.firstName));
file.read((char*)&cur->m_data.lastName, sizeof(cur->m_data.lastName));
file.read((char*)&cur->m_data.hrWage, sizeof(cur->m_data.hrWage));
file.read((char*)&cur->m_data.hrWork, sizeof(cur->m_data.hrWork));
prev = cur;
cur = cur->m_next;
}
return;
}
else
{
cout << "File could not be opened..n" << endl;
}
file.close();
}
void writeBin()
{
ofstream file;
file.open("Employee Data Output.bin", ios::binary);
if (file)
{
Node* cur = head;
Node* prev = nullptr;
while (cur != nullptr)
{
file.write((char*)&cur->m_data.firstName, sizeof(cur->m_data.firstName));
file.write((char*)&cur->m_data.lastName, sizeof(cur->m_data.lastName));
file.write((char*)&cur->m_data.hrWage, sizeof(cur->m_data.hrWage));
file.write((char*)&cur->m_data.hrWork, sizeof(cur->m_data.hrWork));
prev = cur;
cur = cur->m_next;
}
}
else
{
cout << "File could not be opened..n" << endl;
}
file.close();
}
};
节点类
class Node
{
public:
Employee m_data;
Node* m_next;
Node()
{
m_data.firstName = "";
m_data.lastName = "";
m_data.hrWage = 0;
m_data.hrWork = 0;
m_next = nullptr;
}
Node(Node* next)
{
m_data.firstName = "";
m_data.lastName = "";
m_data.hrWage = 0;
m_data.hrWork = 0;
m_next = next;
}
Node(const Node& copy)
{
m_data.firstName = copy.m_data.firstName;
m_data.lastName = copy.m_data.lastName;
m_data.hrWage = copy.m_data.hrWage;
m_data.hrWork = copy.m_data.hrWork;
}
Node operator = (const Node& copy)
{
m_data.firstName = copy.m_data.firstName;
m_data.lastName = copy.m_data.lastName;
m_data.hrWage = copy.m_data.hrWage;
m_data.hrWork = copy.m_data.hrWork;
return *this;
}
~Node()
{
}
};
员工类别
struct Employee
{
public:
string firstName;
string lastName;
int hrWage;
int hrWork;
Employee()
{
firstName = "";
lastName = "";
hrWage = 0;
hrWork = 0;
}
Employee(string first, string last, int wage, int work)
{
firstName = first;
lastName = last;
hrWage = wage;
hrWork = work;
}
~Employee()
{
}
void getInput()
{
for (int i = 0; i < 4; i++)
{
cout << "EMPLOYEE # " << i+1 << ":n" << endl;
cout << "First name: ";
cin >> this[i].firstName;
cout << "Last name: ";
cin >> this[i].lastName;
cout << "Hourly Wage: ";
cin >> this[i].hrWage;
cout << "Hours Worked: ";
cin >> this[i].hrWork;
}
}
void writeBin()
{
ofstream file;
file.open("C:\Users\there\source\repos\cst126-lab9-JEmersonLawrance\BlankConsoleLab\Employee Data.bin", ios::binary);
if (file)
{
for (int i = 0; i < 4; i++)
{
file.write((char*)&this[i].firstName, sizeof(this[i].firstName));
file.write((char*)&this[i].lastName, sizeof(this[i].lastName));
file.write((char*)&this[i].hrWage, sizeof(this[i]).hrWage);
file.write((char*)&this[i].hrWork, sizeof(this[i]).hrWork);
}
}
else
{
cout << "File could not be opened..n" << endl;
}
file.close();
}
};
主要功能
int main()
{
cout << "In this program, LIST will read the user information"
<< " in from a binary file, and output it into a different binary"
<< " file.n" << endl;
Employee data[4];
data->getInput();
data->writeBin();
//creating linked list
Node fourth;
Node third(&fourth);
Node second(&third);
Node first(&second);
LList LIST(&first, &fourth);
LIST.readBin();
LIST.writeBin();
LIST.print();
return 0;
}
在main()中，您正在使用指向本地Node对象的指针构建LIST对象，这些对象是在main()的调用框架内的自动内存中创建的。当main()退出时，它的所有局部变量都会自动销毁。但是，当LIST对象被破坏时，其析构函数会尝试在那些没有用new在动态内存中创建的Node对象上调用delete。因此，您的代码显示出未定义的行为。