为什么会导致SegFault错误?我试图用gdb运行一次backtrace,但它没有给我任何帮助。 任何帮助,将不胜感激,我一直拉着我的头发超过这个小时。链接列表分段错误
我node.h
#ifndef NODE_H
#define NODE_H
#include <string>
using namespace std;
class Node
{
public:
Node(const string, const int) ;
~Node() { }
void setNext(Node *);//setter for the next variable
Node * getNext();// getter for the next variable
string getKey();// getter for the key variable
int getDistance(); // getter for the dist variable
private:
Node *next;
int dist;
string key;
};
#endif
我Node.cpp
#include "node.h"
#include <string>
Node::Node(string k, int d){
key = k;
dist = d;
}
void Node::setNext(Node * n){
next = n;
}
Node * Node::getNext(){
return next;
}
string Node::getKey(){
return key;
}
int Node::getDistance(){
return dist;
}
我list.h
#ifndef LIST_H
#define LIST_H
#include "node.h"
class SLL
{
public:
SLL();
~SLL() { }
void Insert (string searchKey, int distance);
bool Delete (string searchKey);
void Print();
int Search(string searchKey);
private:
int count;
Node *head;
Node *iterator;
Node *temp;
};
#endif
我List.cpp
#include "list.h"
#include <iostream>
SLL::SLL():head(0){}
void SLL::Insert(string searchKey, int distance){
Node * temp = new Node(searchKey, distance);
if(head == 0){
head = temp;
}
else{
temp->setNext(head);
head = temp;
}
}
bool SLL::Delete(string searchKey){
if(head == 0){
cout << "An attempt was made to delete a node from an empty list" << endl;
}
else{
Node* iterator = head;
Node* last = 0;
while(iterator != 0){
if (iterator->getKey() == searchKey){
break;
}
else{
last = iterator;
iterator = iterator->getNext();
}
}
if (iterator == 0){
return false;
}
else{
if(head == iterator){
head = head->getNext();
}
else {
last->setNext(iterator->getNext());
}
delete iterator;
}
}
}
void SLL:: Print(){
iterator = head;
while(iterator != 0){
cout << iterator->getKey() << "-" << iterator->getDistance() << endl;
iterator = iterator->getNext();
}
}
int SLL::Search(string searchKey){
}
我的main.cpp
#include "list.h"
#include "node.h"
#include <iostream>
using namespace std;
int main(int argc, char* argv[]) {
SLL * sll;
sll->Insert("test", 1);
sll->Insert("test2", 2);
sll->Delete("test");
sll->Print();
}
gdb给你没有帮助?!它应该告诉你你在哪里得到段错误,并且你应该告诉我们。 – us2012 2013-02-15 21:54:35
你认为sll的初始值是什么? – andre 2013-02-15 22:00:28
除了导致已被回答的段错误的bug之外,您还有其他一些问题:1.看看您的ctor的Node。您似乎依赖于列表的下一个字段中最后一个元素为0的事实,但您是否曾将其设置为0? 2.避免在头文件中使用语句,至少在全局范围内使用。这是一个黄蜂巢等待发生(可能不是在一个硬件任务,但它是一个很好的习惯举行)。请参阅http://stackoverflow.com/questions/4872373/why-is-including-using-namespace-into-a-header-file-a-bad-idea-in-c – eladidan 2013-02-15 22:16:42