On Friday, 4 November 2016 at 02:56:07 UTC, Paul Backus wrote:
When I compile this (using DMD 2.069 on Debian Linux), I get an
error saying that I can't call visit from a pure function. This
is surprising, since all visit does (in theory) is call the
provided functions, and all of _them_ are pure.
My question is, is this an unavoidable limitation of visit's
implementation, or is there a way to work around this?
I get the same error with 2.071. (I haven't installed the new
dmd yet.)
I suggest trying it with the latest dmd and filing a bug report.
Taking a quick look at the library code
(https://github.com/dlang/phobos/blob/master/std/variant.d), it
*seems* like everything uses templates and functions returning
auto, so the pureness of visit should be inferred if possible.
