c – error：”尚未声明

intSLLst.cpp:38: error: ‘intSLList’ has not been declared

intSLList看起来像已经被声明给我,所以我真的很困惑.

intSLLst.cpp

#include <iostream>
#include "intSLLst.h"


int intSLList::deleteFromHead(){
}

int main(){

}

intSLLst.h

#ifndef INT_LINKED_LIST
#define INT_LINKED_LIST
#include <cstddef>

class IntSLLNode{
  int info;
  IntSLLNode *next;

  IntSLLNode(int el,IntSLLNode *ptr = NULL){
    info = el; next = ptr;
  }

};

class IntSLList{
 public:
  IntSLList(){
    head = tail = NULL;
  }

  ~IntSLList();

  int isEmpty();
  bool isInList(int) const;

  void addToHead(int);
  void addToTail(int);

  int deleteFromHead();
  int deleteFromTail();
  void deleteNode(int);

 private:
  IntSLLNode *head,*tail;

};

#endif