On Sunday, 6 October 2019 at 07:16:03 UTC, Joseph Rushton
Wakeling wrote:
On Sunday, 6 October 2019 at 03:47:25 UTC, Seb wrote:
My earlier post tried to point out that SumType is an
excellent candidate for v2.
Sorry, Seb, but I don't get this. There's no reason to wait for
a v2 to introduce a new SumType symbol that outperforms the old
Variant (assuming it's not possible to just rewrite the latter
implementation under the hood without changing behaviour).
Well, my guess it will be similar to that one time when `Option`
(https://github.com/dlang/phobos/pull/3915) was rejected because
it was only slightly better than `only` or the other time when it
was attempted to improve `Nullable` (e.g.
https://github.com/dlang/phobos/pull/6253)?
Alternatively, there is also the route pioneered by
std.typecons.wrap whose improvements are - after more than four
years - still stuck in std.experimental.wrap
(https://github.com/dlang/phobos/pull/2945,
https://dlang.org/phobos/std_experimental_typecons.html#.wrap).
On the contrary, the best way to do a v2 is likely to be that
all or most of the stuff we want in it is already there and has
been battle tested in the wild.
A standard library is _not_ supposed to be a place where actual
battle-testing happens. It's where things move when they have
been tested and no longer change. This "readiness" condition is
one of the reasons why only a single function has been added to
Phobos in 2019 so far.
Please don't misunderstand me: I would love to see SumType in
Phobos. There are tons of other great modules that would make a
great base as well, e.g.
http://rumbu13.github.io/decimal/doc/decimal.html,
https://code.dlang.org/packages/optional, or
https://github.com/dlang-community/std_data_json etc.
I plainly doubt that we will ever see them in the current Phobos.
