Question

我正在尝试为类FBLPost创建一个静态int变量currentId，这样每次创建FBLPost对象时，都会为新实例分配该id，并为下一个创建的新实例增加静态currentId 。我的构造函数在FBLPost.cpp中实现。这在java中是一项微不足道的任务，但是C ++让我很难过。我用Google搜索并查看过其他帖子，所以如果我错过了一些原谅我的话。这是我的代码和错误：

C:\Users\Dev\Desktop\myProjects\Assignment_3_220\Assignment3\FBLPost.h|31|error: 'int FBLPost::currentId' is not a static data member of 'class FBLPost'|
C:\Users\Dev\Desktop\myProjects\Assignment_3_220\Assignment3\FBLPost.cpp||In constructor 'FBLPost::FBLPost()':|
C:\Users\Dev\Desktop\myProjects\Assignment_3_220\Assignment3\FBLPost.cpp|5|error: 'currentId' was not declared in this scope|
||=== Build failed: 3 error(s), 3 warning(s) (0 minute(s), 0 second(s)) ===|

当然没有声明currentId，我试图在这里声明它。

此外，如果我尝试删除static关键字，我仍会收到错误，如果我尝试在FBLPost中声明静态变量，我会收到错误。

FBLPost.h

#ifndef FBLPOST_H_INCLUDED
#define FBLPOST_H_INCLUDED
#include <stdio.h>
#include <string>
#include <stdlib.h>
class FBLUser;

using namespace std;

class FBLPost {

   private:
    string Post = "";
    FBLPost* next = 0;
    int likes = 0;
    FBLUser* author;
    int id;

public:
    FBLPost();
    string getPost();
    void setPost(string p);
    FBLPost* getNext();
    void setNext(FBLPost* n);
    int getLikes();
    void incrementLikes();
    void setAuthor(FBLUser* user);
    FBLUser* getAuthor();
};

static int FBLPost::currentId = 0; //This line give me an error

#endif // FBLPOST_H_INCLUDED

FBLPost.cpp

#include "FBLPost.h"
using namespace std;

FBLPost::FBLPost() {
    id = ++currentId;
}


string FBLPost::getPost() {
    return Post;
}
void FBLPost::setPost(string p) {
   Post = p;
}
FBLPost* FBLPost::getNext() {
   return next;
}
void FBLPost::setNext(FBLPost* n) {
   next = n;
}

int FBLPost::getLikes() {
   return likes;
}
void FBLPost::incrementLikes() {
   likes++;
}

void FBLPost::setAuthor(FBLUser* user) {
   author = user;
}

Answer 1

忽略更好的方法......你得到的错误是因为currentId 而不是被宣布为FBLPost的成员。

row

在c ++中获取“不是类的静态成员”错误

1 个答案: