[Bug libstdc++/82262] std::hash<std::optional<T>>::operator() missing remove_const_t

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82262

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Sep 20 13:24:45 2017
New Revision: 253010

URL: https://gcc.gnu.org/viewcvs?rev=253010&root=gcc&view=rev
Log:
PR libstdc++/82262 fix std::hash<std::optional<const T>>

        PR libstdc++/82262
        * include/std/optional (__optional_hash_call_base): Add template
        parameter for remove_const_t<_Tp> and use it consistently.
        * testsuite/20_util/optional/hash.cc: Test optional<const T>.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/optional
    trunk/libstdc++-v3/testsuite/20_util/optional/hash.cc