adding elements of a vector to an unordered set

问题

Is there an easy way to add all the elements of a vector to an unordered_set? They are of the same type. Right now, I am using a for loop and was wondering if there is a better way to do it

回答1:

If you're constructing the unordered_set then:

std::vector<int> v;
std::unordered_set<int> s(v.begin(), v.end());

回答2:

Forgive me if my syntax has any minor bugs, but you can try the std::copy function, its meant for this purpose.

std::vector<int> v;
std::unordered_set<int> s;
std::copy(v.begin(),v.end(),std::inserter(s,s.end()));

来源：https://stackoverflow.com/questions/12850927/adding-elements-of-a-vector-to-an-unordered-set