id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
12473,Alternative parser inside permutation parser synthesizes uninitialized optional<>,edaskel@…,Joel de Guzman,"In the process of developing a grammar I discovered a strange behavior where combining alternative and permutation parsers with attributeless parsers can result in invalid optional<> objects.  For example, using ""eps"" as an example of an attributeless parser:

{{{
((int_ | eps) ^ eps)
}}}

is compatible with optional<int> and compiles successfully, but if you parse an input where the int is not present, an uninitialized optional<> is produced - it acts as though it stored an int, but the value is uninitialized (32766, 32765, or 32764, on my system).

The expression:

{{{
(-int_ ^ eps)
}}}

also displays this behavior.

I do have a workaround - using ''only'' the permutation parser works correctly.
",Bugs,closed,To Be Determined,spirit,Boost 1.61.0,Problem,fixed,,