Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I have a couple questions about how to use C++ sets (std::set)
Is there a way to get the union, intersection, or difference of two C++ sets? (It’s pretty easy to write my own functionto do that but I wanted to know if there was a built in function for it)
Can C++ sets be used as keys in a map?
Use the
set_difference(),set_union(),set_intersection()andset_symmetric_difference()functions.Sets and maps support any key type that can compare. By default this means the type has
operator<()defined, but you can provide your own comparator. C++ sets don’t haveoperator<()defined and therefore can’t be used as keys unless you provide your own comparator.