How to group together objects with same name?

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I have these classes:

C++

class Restaurant {
    public:
    std::string name;
    std::set<std::string> food;
};

class Owner {
    public:
    Restaurant *res;
    int position;
}

And then I have this vector

std::vector<Owner> vec;

I need to group the owners having the same name together. how can I do so?

What I have tried:

I know I can loop through it like this to print:

C++

for (auto v : vec ){
     cout << v.res->name << "- " << v.position << endl;

}

giving me:

C++

branch1- 4
branch2- 10
branch3- 3
branch1- 2

However, what I want is:

branch1- 6
branch2- 10
branch3- 3

Posted 21-Nov-20 16:52pm

Member 14999390

Updated 21-Nov-20 17:30pm

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k5054 · Answer 1 · 2020-11-21T17:30:00

Solution 1

Use a map:

C++

std::map<std::string, int> groups;

//Build the map from the vector;
for(auto v : vec) {
    groups[v.res->name] += v.position; 
}


// print it out
for(auto totals : groups) {
     std::cout << totals.first << "- " << totals.second << std::endl;
}

Posted 21-Nov-20 17:30pm

k5054

Updated 21-Nov-20 18:00pm

v4