C++模板"class type"错误
C++ Template "class type" Errors
我一直在研究一个链表模板类,用各种变量做同样的事情,并设法解决了大部分问题。 除了我编译时,我得到这些:
g++ -Wall -o template_test template_test.cpp
In file included from template_test.cpp:1:0:
LinkedList.h:50:11: error: declaration of ‘class Type’
LinkedList.h:7:11: error: shadows template parm ‘class Type’
LinkedList.h:51:30: error: invalid use of incomplete type ‘class LinkedList<Type>’
LinkedList.h:8:7: error: declaration of ‘class LinkedList<Type>’
LinkedList.h:56:11: error: declaration of ‘class Type’
LinkedList.h:7:11: error: shadows template parm ‘class Type’
LinkedList.h:57:51: error: invalid use of incomplete type ‘class LinkedList<Type>’
LinkedList.h:8:7: error: declaration of ‘class LinkedList<Type>’
LinkedList.h:92:11: error: declaration of ‘class Type’
LinkedList.h:7:11: error: shadows template parm ‘class Type’
LinkedList.h:93:31: error: invalid use of incomplete type ‘class LinkedList<Type>’
LinkedList.h:8:7: error: declaration of ‘class LinkedList<Type>’
LinkedList.h:102:11: error: declaration of ‘class Type’
LinkedList.h:7:11: error: shadows template parm ‘class Type’
LinkedList.h:103:34: error: invalid use of incomplete type ‘class LinkedList<Type>’
LinkedList.h:8:7: error: declaration of ‘class LinkedList<Type>’
LinkedList.h:119:11: error: declaration of ‘class Type’
LinkedList.h:7:11: error: shadows template parm ‘class Type’
LinkedList.h:120:48: error: invalid use of incomplete type ‘class LinkedList<Type>’
LinkedList.h:8:7: error: declaration of ‘class LinkedList<Type>’
LinkedList.h:158:11: error: declaration of ‘class Type’
LinkedList.h:7:11: error: shadows template parm ‘class Type’
LinkedList.h:159:37: error: invalid use of incomplete type ‘class LinkedList<Type>’
LinkedList.h:8:7: error: declaration of ‘class LinkedList<Type>’
LinkedList.h:193:11: error: declaration of ‘class Type’
LinkedList.h:7:11: error: shadows template parm ‘class Type’
LinkedList.h:194:34: error: invalid use of incomplete type ‘class LinkedList<Type>’
LinkedList.h:8:7: error: declaration of ‘class LinkedList<Type>’
LinkedList.h:210:11: error: declaration of ‘class Type’
LinkedList.h:7:11: error: shadows template parm ‘class Type’
LinkedList.h:211:34: error: invalid use of incomplete type ‘class LinkedList<Type>’
LinkedList.h:8:7: error: declaration of ‘class LinkedList<Type>’
make: *** [template_test] Error 1
对于我拥有的每个模板函数,它几乎都说同样的事情。 任何人都可以为我破译这些消息的含义,是什么导致编译器抛出这些消息,以及我该如何解决这个问题? 我将重读,并可能在此期间重写我的代码。
我的代码如下:
#include <string>
#include <iostream>
using namespace std;
template <class Type>
class LinkedList{
public:
* default constructor and a copy constructor that creates a copy
* of the given object*/
LinkedList(); //default construtor
LinkedList(const LinkedList& lst); //copy constructor
~LinkedList();//destructor
void add(Type data);
void insertAt(int pos, Type data);
bool remove(Type data );
void removeAll();
void printList();
template <class Type>
LinkedList<Type>::LinkedList(){
head = NULL;
size = 0; //Don't forget to do this!!!
}
template <class Type>
LinkedList<Type>::LinkedList(const LinkedList& lst){
if (lst.head == NULL){
head = NULL;
size = 0;
}
else{
head = new Node;
head->data = lst.head->data;
Node *pNewNode = head;
Node *pOldNode = lst.head->next;
while (pOldNode != NULL){
pNewNode->next = new Node;
pNewNode = pNewNode->next;
pNewNode->data = pOldNode->data;;
pOldNode = pOldNode->next;
}
pNewNode->next = NULL;
size = lst.size;
}
}
template <class Type>
LinkedList<Type>::~LinkedList(){
removeAll();
}
template <class Type>
void LinkedList<Type>::add(Type x){
Node *p = new Node; //temporary node
// Assign appropriate values to the new node
p -> data = x;
p -> next = head;
// Make the head point to the new node
head = p;
size++;
}
template <class Type>
void LinkedList<Type>::insertAt(int pos, Type x){
Node *p;
Node *newNode;
// Check that pos is a valid index
if (pos <= size){
newNode = new Node; //new node
newNode->data = x;
// Deal with case when item is to be inserted at the head of the list
if (pos == 0){
newNode->next = head;
head = newNode;
}// if(pos == 0)
else{
p = head;
// Move to position BEFORE insertion point
for(int i = 0; i < pos-1; i++){
// Check that p points to a node
// Note using exception handling should throw an exception
if(p == NULL){
return;
}
p = p->next;
}//for
// Insert node
newNode->next = p->next;
p->next = newNode;
}//else (pos != 0)
size++;
}//else (pos >= size) do nothing
}
template <class Type>
bool LinkedList<Type>::remove(Type x){
Node *p = head;
Node *temp;
if (head == NULL){
return false;
}
else if (head->data == x){
head = head->next;
delete p; //currently assigned head
size--;
return true;
}
else{
while(p->next != NULL){
// Check next node for target
if(p->next->data == x){
temp = p->next;
p->next = p->next->next;
delete temp;
return true;
}
p = p->next;
}
}
return false;
}
template <class Type>
void LinkedList<Type>::removeAll(){
Node *p = head;
// Traverse the list deleting nodes
while (p!= NULL){
head = head->next; // Mustn't "lose" the next node
delete p; // De-allocate memory
p = head; // Go to next node
}
head = NULL;
size = 0;
}
template <class Type>
void LinkedList<Type>::printList(){
Node *p = head;
cout << "["; //Nice format!
// Traverse the list
while (p != NULL){
cout << p -> data; // Print data
p = p -> next; // Go to next node
if (p != NULL){
cout << ","; // Print a comma unless at the end of the list
}
}
cout << "]"; // Don't print a newline - it might not be wanted
}
private:
struct Node {
Type data; //list data
Node *next; //pointer to next item in the list
};
Node *head; //Pointer to the first node in the list
int size; //Records the number of nodes in the list
};
您正在使用语法来定义类内类范围之外的成员函数。这行不通。
这应该这样做:
template<typename X>
class Foo {
public:
void f();
}; // notice end of class scope here
template<typename X>
void Foo<X>::f() {
// impl
}
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