[Bug c++/57489] [4.8 regression]: invalid code generated for conditional in template function

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57489

--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Did you try adding parentheses around c - '0'? Seems to me that you overflow
otherwise.