How to check if std::map contains a key without doing insert?

Question

The only way I have found to check for duplicates is by inserting and checking the std::pair.second for false, but the problem is that this still i

Answer 1

Your desideratum,map.contains(key), is scheduled for the draft standard C++2a. In 2017 it was implemented by gcc 9.2. It's also in the current clang.