How to insert into std::map?

I think what the OP is looking for is std::inserter(mymap, mymap.end())

so you can do:

std::copy( inp.begin(), inp.end(), std::inserter(mymap, mymap.end()) );

The input types must be a pair type that your map takes, otherwise your algorithm would need to be std::transform with a function/functor to convert the input type into such a std::pair.

inserter is not actually an iterator but a templated function that produces an iterator (std::insert_iterator, which is a templated type but the type is automatically resolved in the function call).