On Tuesday, 14 April 2015 at 19:38:10 UTC, Nordlöw wrote:
I have implemented a type constructor [Ii]ndexedBy at
https://github.com/nordlow/justd/blob/master/typecons_ex.d#L97
restricted by
https://github.com/nordlow/justd/blob/master/typecons_ex.d#L78
See unittests below for usage.
I would now like to extend this to enable a variant usage as
auto xs = x.indexedBy!"I"
I want this to trigger a mixin that defines a
struct I
inside the struct IndexedBy.
But I don't know how to change the definitions of
- isIndexableBy
- [iI]ndexedBy
in order for this work.
I started by replace all template arguments
I
with
alias I
which I believe is the way to go to make it possible for I to
either a type or a CT-string. But then I get lots of strange
compiler messages that I can't figure out what to do with.
Further is my mixin attempt at
https://github.com/nordlow/justd/blob/master/typecons_ex.d#L99
in the right direction. If so do I have to turn IndexedBy into
a template mixin?
Could someone please help me out here?
I managed to make it all work at
https://github.com/nordlow/justd/blob/master/typecons_ex.d#L114
by using two separate definitions of [Ii]ndexedBy for the cases
where I is either a string literal or a type. This is not ideal
though because it causes code duplication in the two definitions
of IndexedBy. Can anybody come up with an alternate definition of
[Ii]ndexedBy that doesn't required two separated definitions?
