需要幫助從main訪問在Class_D中聲明的函數好友。 指導繼續。訪問好友功能
/* Main.cpp */
#include <iostream>
#include "types.h"
#include "Class_A.h"
#include "Class_C.h"
int main()
{
cout << " Project started" << endl;
/* Creating Obj of Class A */
A obj1;
/* Accessing Funcition of Class C through A */
obj1.SetFuncA();
/* How to access GetFuncD(); from main*/
cin.get();
return 0;
}
/* types.h */
#ifndef TYPES_H
#define TYPES_H
#include <iostream>
#include <stdlib.h>
#define ENAB_FRIEND_CLASS(x) friend class x
using namespace std;
typedef unsigned int U32;
typedef unsigned short U16;
typedef unsigned char U8;
typedef int S32;
typedef short S16;
typedef char S8;
#endif
/* Class_A.h*/
#ifndef CLASS_A_H
#define CLASS_A_H
class D;
class A {
private :
int i;
int j;
public :
A(); /* Default Constructor */
~A(); /* Default Destructor */
void SetFuncA();
int GetFuncA();
friend int D::FGetFuncD(D &obj);
protected:
};
#endif
/* Class_D.h */
#ifndef CLASS_D_H
#define CLASS_D_H
class D {
private :
int i;
int j;
public :
D(); /* Default Constructor */
~D(); /* Default Destructor */
void SetFuncD();
int GetFuncD();
void FGetFuncD(D &obj);
protected:
};
void FGetFuncD(D &obj)
{
cout << "\n i " << obj.i << endl;
cout << "\n i " << obj.j << endl;
}
#endif
/* Class_A.cpp */
#include "Class_A.h"
#include "types.h"
#include "Class_C.h"
A :: A()
{
cout << "Default CTOR Called\n" << endl;
}
A :: ~A()
{
cout << "Default DTOR Called\n" << endl;
}
void A::SetFuncA()
{
int ret = 0;
cout << "\n SetFuncA " << endl;
/* Creating Object of class C in Class A*/
C Obj2;
/* Setting Private members */
Obj2.SetFuncC();
/* Calling Function of class C in Class A */
ret = Obj2.GetFuncC();
cout << " M = " << ret << endl;
/* Dynamically Allocate memory for Class C */
C *ptr = new C();
/* Accessing private members of Class C */
ptr->m =20;
/* Accessing Public Function of Class C*/
ret = ptr->GetFuncC();
cout << " M = " << ret << endl;
/* Accessing Enum */
ptr->m_bLEVEL = ptr->KN_LEVEL_1;
cout << " ENUM = " << ptr->m_bLEVEL << endl;
}
int A::GetFuncA()
{
cout << "\n GetFuncA " << endl;
}
/* Class_D.cpp*/
#include "types.h"
#include "Class_D.h"
D :: D()
{
cout << "Default CTOR Called\n" << endl;
}
D :: ~D()
{
cout << "Default DTOR Called\n" << endl;
}
void D::SetFuncD()
{
cout << "\n SetFuncD " << endl;
i = 30;
}
int D::GetFuncD()
{
cout << "\n GetFuncD " << endl;
return i;
}
請指導我修改需要做的訪問class_d的私人成員與朋友功能。
我想探索朋友功能的功能。 並且我添加了Class_A.cpp/.h Class_D.cpp/.h和main.cpp。
你到底有什麼問題?您使用'D :: GetFuncD'的方式與'A類'相同。包含'class_d.h',創建一個'D'對象,然後調用'GetFuncD'方法。 – greatwolf