c++ 上的向量作為 class 的成員

Question

我有一個問題，其中getUserOpinionVector() 、 getAppConstructorVector() 、 setUserOpinionVector() 、 setAppConstructorVector()無法訪問UserOpinionVector 、 AppConstructorVector屬性。

有什么建議嗎？

我在下面粘貼了我的代碼。

注意：為簡單起見，跳過了構造函數和一些屬性和方法。

c++ 上的 .h 文件：

#ifndef APPLICATION_H
#define APPLICATION_H
#include "ApplicationConstructor.h"    
#include <vector>

using namespace std;

class Application{  
  private:
   ApplicationConstructor &AppConstructor;
   UserOpinion *UserView;
  public:
   Application(char *, string, string, ApplicationConstructor &, UserOpinion &, float); // Application's Constructor
   Application(const Application &); // Copy Constructor     
   vector<ApplicationConstructor &> getAppConstructorVector(); // Get the Application Constructor Vector
   vector<UserOpinion *> getUserOpinionVector(); // Get the User Opinion Vector       
   void setAppConstructorVector(vector<ApplicationConstructor &>); // Set the Application Constructor Vector
   void setUserOpinionVector(vector<UserOpinion *>); // Set the User Opinion Vector  
   virtual ~Application(); // Destructor
  protected:
   vector<ApplicationConstructor &> AppConstructorVector; // Vector with Application Constructor Objects
   vector<UserOpinion *> UserOpinionVector; // Vector pointers to with User Opinion Objects   
   };
   #endif /* APPLICATION_H */

cpp文件：

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

//Constructor
Application::Application(char *applicationCode, string applicationName, float applicationVersion, 
                     ApplicationConstructor &appConstructor , UserOpinion *userComment, float price ):AppConstructor(appConstructor){
if ((this->AppConstructor != NULL) && (this->UserView != NULL ))
{
    this->addToAppConstructorVector(this->AppConstructor);
    this->addToUserOpinionVector(this->UserView);
}
}

// Set the Application Constructor Vector
void setAppConstructorVector(vector<ApplicationConstructor &> appConstructorVector){
   this->AppConstructorVector = appConstructorVector;
}

// Set the User Opinion Vector  
void setUserOpinionVector(vector<UserOpinion *> userOpinionVector){
   this->UserOpinionVector = userOpinionVector;
}

// Get the Application Constructor Vector
vector<ApplicationConstructor &> getAppConstructorVector(){
  return this->AppConstructorVector;
}

// Get the User Opinion Vector
vector<UserOpinion *> getUserOpinionVector(){
 return this->UserOpinionVector;
}        

Answer 1

這些函數應定義為 class Application的成員函數。

這意味着您應該在每個 function 名稱之前添加Application:: ，如下所示：

// Set the Application Constructor Vector
void Application::setAppConstructorVector(vector<ApplicationConstructor &> appConstructorVector){
   this->AppConstructorVector = appConstructorVector;
}

// Set the User Opinion Vector  
void Application::setUserOpinionVector(vector<UserOpinion *> userOpinionVector){
   this->UserOpinionVector = userOpinionVector;
}

// Get the Application Constructor Vector
vector<ApplicationConstructor &> Application::getAppConstructorVector(){
  return this->AppConstructorVector;
}

// Get the User Opinion Vector
vector<UserOpinion *> Application::getUserOpinionVector(){
 return this->UserOpinionVector;
}

Answer 2

除非您在 class 上聲明，否則您不能使用 function，這就是您無法訪問它的原因

// Set the User Opinion Vector  
void Application::setUserOpinionVector(vector<UserOpinion *> userOpinionVector){
   this->UserOpinionVector = userOpinionVector;
}

嘗試首先添加 class 的名稱，同時在 header 文件中將 function 添加為 public

class Application{  
  private:
   ApplicationConstructor &AppConstructor;
   UserOpinion *UserView;
  public:
   ....
   void setUserOpinionVector(vector<UserOpinion *> userOpinionVector)

希望能幫助到你