[Bug libstdc++/56627] class hash instead of struct hash

[andreas.hansson at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56627

--- Comment #2 from ahansson <andreas.hansson at gmail dot com> 2013-03-15 21:04:01 UTC ---
(In reply to comment #1)
> In C++, class and struct are interchangeable.

Agreed. Technically the code is ok, and in line with the language standard. 

However, as at least one of the most popular compilers (clang 3.2 RELEASE with
-Wall) issues a warning for this. Thus, it might be worthwhile fixing.