这些似乎是我唯一的错误。据我了解，如果我将“sortedListClass”设置为等于另一个声明的“sortedListClass”，或者如果我询问它们是否小于、等于、不等于等，我只需要重载一个运算符。但这些是用户声明...没有声明“sortedListClasses”所以我很困惑..任何人都可以阐明这些编译错误吗？谢谢！
我将包括我拥有的所有代码，以防其中任何一个对错误有重要意义......
基本上我正在处理带有结构和指针的链表..
这是我的清单.h：
#ifndef LIST_H
#define LIST_H
struct cities
{
string city;
};
typedef cities listItemType;
typedef struct Node* nodePtr;
struct Node
{
listItemType data;
nodePtr next;
};
#endif
这是我的 sortedListClass.h ：
#include <iostream>
#include <fstream>
using namespace std;
#include "list.h"
#ifndef sortedList_Class
#define sortedList_Class
class sortedListClass
{
private:
int size;
nodePtr Head;
public:
//Constructors and Destructor
sortedListClass();
sortedListClass(const sortedListClass& L);
~sortedListClass();
//List operations
void ListInsert(listItemType NewItem);
void ListDelete();
void RetrieveCity();
void PrintList();
int ListLength() const;
bool ListIsEmpty() const;
}; //End Class
#endif
这是我的 sortedListClass.cpp ：
//Sorted List Class
//Contains function definitions for actions towards the cities Linked List
#include "sortedListClass.h"
#include <iostream>
#include <cstdlib>
#include <string>
sortedListClass::sortedListClass()
{
size = 0;
Head = NULL;
}
sortedListClass::sortedListClass(const sortedListClass& List)
{
if(List.Head == NULL)
Head = NULL;
else
{
Head = new Node;
Head->data = List.Head->data;
nodePtr NewPtr = Head;
for(nodePtr OrigPtr = List.Head -> next; OrigPtr != NULL; OrigPtr = OrigPtr-> next)
{
NewPtr-> next = new Node;
NewPtr = NewPtr -> next;
NewPtr -> data = OrigPtr -> data;
}
NewPtr -> next = NULL;
}
}
sortedListClass::~sortedListClass()
{
bool success;
while(!ListIsEmpty())
ListDelete();
}
bool sortedListClass::ListIsEmpty() const
{
return bool( size == 0);
}
int sortedListClass::ListLength() const
{
return size;
}
void sortedListClass::RetrieveCity()
{
string city;
bool success;
cout <<"Input a city name: ";
cin >> city;
cout << endl;
nodePtr cur = Head;
while(cur != NULL)
{
if(cur->data == city)
{
cout <<"This city is found" << endl;
success = true;
}
cur = cur->next;
}
if(!success)
cout <<"This city is not served" << endl;
}
void sortedListClass::PrintList()
{
nodePtr cur = Head;
cout << "Number of cities: " << size << endl;
while(cur!= NULL)
{
cout <<cur->data;
cur = cur->next;
}
}
void sortedListClass::ListInsert(listItemType Item)
{
nodePtr newNode = new Node;
newNode -> data = Item;
newNode->next = NULL;
if(Head = NULL)
Head = newNode;
else if (Item < Head->data)
{
newNode->next = Head;
Head = newNode;
}
nodePtr curr = Head, prev = Head;
while((newNode->data > curr->data) && (curr != NULL))
{
prev = curr;
curr = curr -> next;
}
if(curr->next == NULL)
{
curr->next = newNode;
newNode->next = NULL;
}
else if(curr->data > newNode->data)
{
newNode->next = curr;
prev->next = newNode;
}
}
void sortedListClass::ListDelete()
{
bool success = false;
string city;
cout << "Enter a city name to delete from the list: " << endl;
cin >> city;
nodePtr p = new Node;
nodePtr curr, prev;
curr = Head;
prev = Head;
p -> data = city;
p -> next = NULL;
if(Head == NULL)
cout <<"Unable to delete anything, list is empty." << endl;
else
{
while(curr->next != NULL)
{
if(curr -> data == p -> data)
{
prev->next = curr->next;
curr->next = NULL;
delete curr;
curr = NULL;
success = true;
}
else
prev = curr;
curr = curr->next;
}
}
if(!success)
cout <<"This city does not exist. Deletion cannot be performed." << endl;
}
这是我得到的错误......
sortedListClass.cpp: In member function ‘void sortedListClass::RetrieveCity()’:
sortedListClass.cpp:63: error: no match for ‘operator==’ in ‘cur->Node::data == city’
sortedListClass.cpp: In member function ‘void sortedListClass::PrintList()’:
sortedListClass.cpp:81: error: no match for ‘operator<<’ in ‘std::cout << cur->Node::data’
/usr/include/c++/4.4/ostream:108: note: candidates are: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ostream<_CharT, _Traits>& (*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:117: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:127: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:165: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:169: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:173: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:91: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:180: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:105: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:191: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:200: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:204: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:209: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:213: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:221: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:225: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:119: note: std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]
sortedListClass.cpp: In member function ‘void sortedListClass::ListInsert(listItemType)’:
sortedListClass.cpp:93: error: no match for ‘operator<’ in ‘Item < ((sortedListClass*)this)->sortedListClass::Head->Node::data’
sortedListClass.cpp:100: error: no match for ‘operator>’ in ‘newNode->Node::data > curr->Node::data’
sortedListClass.cpp:111: error: no match for ‘operator>’ in ‘curr->Node::data > newNode->Node::data’
sortedListClass.cpp: In member function ‘void sortedListClass::ListDelete()’:
sortedListClass.cpp:128: error: no match for ‘operator=’ in ‘p->Node::data = city’
list.h:5: note: candidates are: cities& cities::operator=(const cities&)
sortedListClass.cpp:136: error: no match for ‘operator==’ in ‘curr->Node::data == p->Node::data’
[1]+ Done scite sortedListClass.cpp