CODEWITHSUNDEEP
c++vectorstruct
Chiffa
Chiffa

Reputation: 1506

Modifying a member of a struct in a vector if another member of that struct is known

Disclaimer: I tried searching both online generally and here specifically. If this question has been answered already, please redirect me and close this one.

I have a coding problem and I'm trying to solve it with the following code:

#include <fstream>
#include <map>
#include <string>
#include <vector>

using namespace std;

int main()
{
    ifstream fin("gifts1.in", ios::in);
    ofstream fout("gifts1.out", ios::out);

    unsigned short NP;

    struct person
    {
        string name;
        unsigned int gave;
        unsigned int received;
    };

    vector<person> accounts;

    string tmp_name;
    person buf_person;

    fin >> NP;
    accounts.resize(NP);
    for (auto i : accounts)
    {
        fin >> tmp_name;
        i.name = tmp_name;
        i.gave = i.received = 0;
    }

    for (auto j : accounts)
    {
        string name;
        fin >> name;

        unsigned int sum, people;
        fin >> sum >> people;
        j.gave = sum;
        if (people != 0)
        {

            for (int i = 1; i < people; i++)
            {
                string receiver_name;
                fin >> receiver_name;
                accounts.receiver_name.received = sum / people;   // no idea here
            }

            j.gave -= sum % people;   // if a person meant to give 200, but couldn't divide 3,
            // he actually gave 197
        }
    }

    fin.close();
    fout.close();

    exit(0);
}

The inner for loop is supposed to work like this: I'm given a string receiver_name, I'm searching in a vector for a particular person struct that has this name as a name member and change its received member.

The question is: is this possible and how do I do it if it is?

Upvotes: 1

Views: 52

Answers (1)

Igor Tandetnik
Igor Tandetnik

Reputation: 52471

vector<person>::iterator it = std::find_if(accounts.begin(), accounts.end(),
  [&receiver_name](const person& p) { return p.name == receiver_name; });
if (it == accounts.end()) {
  // No person with this name
} else {
  person& found = *it;
  // Do what you need here.
}

Upvotes: 3

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