[Bug libstdc++/52942] [4.7/4.8 Regression] using std::ref with a std::unordered_map fails to compile

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52942

--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-04-12 09:33:14 UTC ---
Uhm, short term, I like even better just not using _Select1st *at all*, have an
implementation detail in the hashtable header itself not deriving from
unary_function. Isn't that a bit redundant but cleaner?