Question

我在尝试编译项目时遇到此错误，但我不知道为什么。另外我得到了

“错误：'CrewMember'尚未声明” 对于类方法，以及'＆lt;'token“
之前的错误”expected'，'或'...'

我很确定问题是关于放置正确的“包含”但不能把我的手指放在它上面

这是我的代码：

#ifndef SMALLTOBIGIDSORTER_H_
#define SMALLTOBIGIDSORTER_H_
#include "CrewSorter.h"
#include "CrewMember.h"

//this is the line where i get the error
class SmallToBigIdSorter: public CrewSorter {
public:
    SmallToBigIdSorter();
    ~SmallToBigIdSorter();
    //this is where i'm getting the second error error: ‘CrewMember’ has not been declared
    bool compare(CrewMember* member1, CrewMember* member2);
};

#endif /* SMALLTOBIGIDSORTER_H_ */

CrewSorter类：

#ifndef CREWSORTER_H_
#define CREWSORTER_H_
#include "CrewMember.h"
#include <vector>
using namespace std;
class CrewSorter {
public:
    CrewSorter();
    virtual ~CrewSorter();
//expected ‘,’ or ‘...’ before ‘<’ token
    void addCrewMember(vector<CrewMember*>* membersList, CrewMember* newMember);
    void removeCrewMember(vector<CrewMember*>* membersList, int id);
    void sortCrewList(vector<CrewMember*>* membersList);
    virtual bool compare(CrewMember* member1, CrewMember* member2);
};

#endif /* CREWSORTER_H_ */

CrewMember课程：

#ifndef CREWMEMBER_H_
#define CREWMEMBER_H_
#include "Movie.h"
#include <iostream>
#include <string>

using namespace std;
class Movie;
class CrewMember {
protected:
    string name;
    int id;
    int age;
    char gender;
    int moviesNumber;
    vector<Movie*>* movies;
    string jobDescription;

public:

    /*
    * the function will print a string representing the
    * employee unique string
    */
    virtual void print(std::ostream& str) const = 0;
    friend ostream& operator<<(ostream& os, const CrewMember& crewMember);

    /*
    *  the function will add the given movie
    * to the crew member
    */
    void addMovie(Movie* newMovie);

    /*
    *  the function will remove the given movie
    * from the crew member
    */
    void removeMovie(string movieId);

    vector<Movie*> copyMovieList();

    bool movieExists(Movie* movie);

    /*
    * will print the movie list of the crew member
    */
    void printMovies();
    void printMember();


    /*
     * constructor
     */
    CrewMember();
    CrewMember(string name, int id ,int age, char gender,
                        vector<Movie*>* movies, string jobDescription);

    void removeFromAllMovies();

    /*
     * destructor
     */
    virtual ~CrewMember();

    /*
     * getters
     */
    vector<Movie*>* getMovies() const;
    int getMoviesNumber() const;
    int getId() const;
    int getAge() const;
    string getName() const;
    string  getDescription() const;
};

#endif /* CREWMEMBER_H_ */

Answer 1

在你的CrewSorter和SmallToBigIdSorter中，你只使用CrewMember* - 所以你可以在头文件（两个分类器类）中只使用前向声明。

class CrewMember;

class SmallToBigIdSorter : public CrewSorter {
// ...

然后在.cpp文件中#include "CrewMember.h"，因此它知道实际的实现。

在'{'标记C ++之前错误预期的类名

1 个答案: