[Bug libstdc++/51795] linear_congruential_engine doesn't work correctly

[paolo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51795

--- Comment #26 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> 
2012-01-27 23:30:41 UTC ---
Author: paolo
Date: Fri Jan 27 23:30:28 2012
New Revision: 183655

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=183655
Log:
2012-01-27  Paolo Carlini  <paolo.carl...@oracle.com>

    PR libstdc++/51795
    * include/bits/random.h (linear_congruential_generator): Add
    static_assert preventing instantiation for values of 'a' and 'm'
    currently handled incorrectly but _Mod::__calc.
    * include/bits/random.tcc (seed_seq::generate): Avoid unsafe
    uses of _Mod::__calc.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/random.h
    trunk/libstdc++-v3/include/bits/random.tcc