[Bug libstdc++/44436] [C++0x] Implement emplace* in associative and unordered containers

["Kira.Backes at NRWsoft dot de" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44436

--- Comment #21 from Kira Backes <Kira.Backes at NRWsoft dot de> 2011-06-09 12:21:07 UTC ---
Hi,



I don't mean a pair of unique_ptr, just any combination with a unique_ptr.

I for example very often need:

std::map<uint32_t, unique_ptr<User>> instancesByIds_;


Now if I want to insert a User, with a shared_ptr I'd have to do:

instancesByIds_[id] = user;


Now with a unique_ptr I'd like to do the same:


instancesByIds_[id] = user;
instancesByIds_[id] = std::move(user);

Both doesnt work. Emplace is the practical solution (please correct me if
there's a better way):


instancesByIds_.emplace(id, std::move(user));



rgds, Kira