How can I fill a map with a vector?

Question

I have the following test code:

class Person{};


shared_ptr<Person> sp1;
shared_ptr<Person> sp2;
shared_ptr<Person> sp3;

vector<shared_ptr<Person>> members = {sp1,sp2,sp3};

map<string, shared_ptr<Person>> mymap;

How can I set the vector members to the second element of mymap? I tried with for and copy .

Answer 1

map is an associative container, so you need to specify the key in string type to associate it to the shared_ptr<Person>. I don't know what you need, but the following loop should work:

for (size_t i = 0; i < members.size(); ++i) {
  const std::string key = "sp" + std::to_string(i+1);
  mymap[key] = members[i];
}