如何在 C++ 中访问另一个类中的向量对象

Question

I am newbie to c++.I have created two classes.one class(say A) will push the struct data into vector while other class(say B) will pop out the data from the vector.

How do I pass the reference of vector from class A to B so that class B can point to same vector object to pop out data,to do some manipulation.

can anyone help me to resolve this

So far My effort is, Ah file:

struct strctOfA {
       int x;
       int y;
       int z;
    };  


class A {
public:

A();        
private:
     std::vector<strctOfA> t2;
};

A.cpp file:

         A::A() {

        strctOfA player;
        player.x=1;
        player.y=2;
        player.z=3;



        t2.push_back(player)
        B b;
        b.functionOfB(&t2); 
        }

Bh file

         class B {

        public:
             B();
             functionOfB(&t2);
        };

B.cpp:

 B::functionOfB(A &t) {
    t2.pop_front(); 
    }

Answer 1

Use a friend class, this is a class that has been declared as friend (with the keyword friend) in another class. It can access private and protected members of other class. It is useful to allow a particular class to access private members of the other class. Example:

ah

typedef struct strctOfA {
   int x;
   int y;
   int z;
}positions;
class A {
public:
    A();
    friend class B;
private:
    strctOfA player;
    std::vector<positions> t2;
};

a.cpp

    A::A() {
    player.x=1;
    player.y=2;
    player.z=3;
    t2.push_back(player);
}

bh

class B {
public:
    B();
    void functionOfB(A &x);
};

b.cpp

B::B() {
}
void B::functionOfB(A &x) {
    x.t2.pop_back();
}

main.cpp

int main() {
    A instanceOfA;
    B *instanceOfB = new B();
    instanceOfB->functionOfB(instanceOfA);
    return 0;
}