CODEWITHSUNDEEP
c++oop
Andrey Arias
Andrey Arias

Reputation: 57

using class instance on two classes..c++

I basically do not know how to ask this question, I am fairly new to c++...anyway my problem is, I am trying to create this vendingmachine class and this user class, the user needs to have access to the insertCoins method and makePurchase methods from vendingMachine.cpp I tried creating an instance of the class vending machine inside the method calls in user.cpp as it is here, but when I try to list the items in vending machine obviously the list is untouched because theinstance I create inside the method calls in user.cpp are just temporary...how would I get a global instance so that I use it within user.cpp while using it within vending machine inside main.cpp...

#include "user.h"
#include "VendingMachine.h"

user::user(){
}

user::~user(){

}

void user::makePurchase(int choice){
    VendingMachine vm;
    vm.purchaseProduct(choice);
}

void user::insertCoins(double coin){
    VendingMachine vm;
    vm.insertCoins(coin);
}

~~~~~~~~~~~~~

#include "VendingMachine.h"
#include "machineOperator.h"
#include "user.h"
using namespace std;

int main(){

VendingMachine vm = VendingMachine();
user u = user();
vm.listProducts();
cout << endl;
u.insertCoins(1.0);
u.insertCoins(1.0);
u.makePurchase(2);
vm.listProducts();
cout << endl;

return 0;

 }

~~~~~~~~~~~~~~~~~~~

    /*
 * user.h
 *
 *  Created on: Jan 12, 2014
 *      Author: Andrey
 */

#ifndef USER_H_
#define USER_H_

class user {

public:
    user();
    ~user();
    void makePurchase(int);
    void insertCoins(double);
};

#endif /* USER_H_ */

Upvotes: 0

Views: 406

Answers (2)

Raniz
Raniz

Reputation: 11113

Use a pointer to the VendingMachine in your user and pass it in to the constructor.

user.h

class VendingMachine;

class User {
    private:
        VendingMachine* vm;
}

user.cc

#include "user.h"
#include "vendingmachine.h"

User::User(VendingMachine* vm): vm(vm) {}

void User::makePurchase(int choice){
    vm->purchaseProduct(choice);
}

void User::insertCoins(double coin){
    vm->insertCoins(coin);
}

main.cc

#include "VendingMachine.h"
#include "machineOperator.h"
#include "user.h"
using namespace std;

int main(){

    VendingMachine vm = VendingMachine();
    User u = User(&vm);
    vm.listProducts();
    cout << endl;
    u.insertCoins(1.0);
    u.insertCoins(1.0);
    u.makePurchase(2);
    vm.listProducts();
    cout << endl;

    return 0;

}

Upvotes: 0

user534498
user534498

Reputation: 3984

It is natural to assume that a user can purchase from and insert coin to many different vending machines.

void user::makePurchase (VendingMachine &vm, int choice)
{
    vm.purchaseProduct(choice);
}

void user::insertCoins (VendingMachine &vm, double coin)
{
    vm.insertCoins(coin);
}

Upvotes: 4

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