On 4/10/18 12:59 PM, Paul Backus wrote:
On Tuesday, 10 April 2018 at 12:34:07 UTC, aliak wrote:
Awesome!
this is a neat trick:
union
{
AliasSeq!(T0, T1) values;
}
Is that usage documented somewhere, or is it somewhere in phobos maybe?
Also, can Algebraic be fully replaced with this version then or is
there some functionality that would stop it going through?
It's called "type sequence instantiation", and it's documented in the
"Compile-time Sequences" article [1] on dlang.org. I discovered it
reading the source of the 'tagged_union' dub package [2]. It's not
mentioned anywhere in the language spec, as far as I can tell.
Ooh! that's really cool.
I've put AliasSeq of types into a struct, but never considered putting
it into a union. This has a lot of potential when you want to
auto-generate unions.
Nice trick!
-Steve
