CODEWITHSUNDEEP
c++c++11
Sprint21
Sprint21

Reputation: 89

Get an element from a vector of pointers

i have vector of pointers: std::vector<Customer*> customersList Now i want to get one of the elements and make my operations on him. i'm not sure that i know how, my guess was:

Customer* source = restaurant.getCustomer(cust);

the problem is that i don't know if in c++ it will create new object or i will just get a reference to him. There is my getter method:

Customer* Table::getCustomer(int id) {
    for (int i = 0; i < customersList.size(); ++i) {
        if (customersList[i]->getId() == id)
            return customersList[i];
    }
    return nullptr;
}

Thank you

Upvotes: 3

Views: 501

Answers (1)

lubgr
lubgr

Reputation: 38315

The member function will return a copy of the pointer, i.e. the Customer object itself is not copied, only the reference to it. Modifying the returned Customer* will result in modifications of the pointee (the underlying object).

Note that you also want to use the <algorithm> header, specifically std::find_if.

const auto  customer = std::find_if(customerList.begin(), customerList.end(),
    [id](const Customer* c){ return c->getId() == id; });

return customer == customerList.cend() ? nullptr : *customer;

Upvotes: 5

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