[Bug libstdc++/89825] Jump table for variant visitation could be shortened for never empty variants

[ville at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89825

--- Comment #5 from ville at gcc dot gnu.org ---
Author: ville
Date: Tue Mar 26 15:00:05 2019
New Revision: 269947

URL: https://gcc.gnu.org/viewcvs?rev=269947&root=gcc&view=rev
Log:
PR libstdc++/89825

Fix based on a suggestion by Antony Polukhin.
* include/std/variant (_Extra_visit_slot_needed): New.
(_Multi_array): Use it.
(_S_apply_all_alts): Likewise.

Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/std/variant