Could be a binary to match to/against, a tuple that defines some internal format, etc...
On Tuesday, August 30, 2016 at 11:53:49 PM UTC-6, Michele Balistreri wrote: > > Macro would also be possible, but in that case you would have to require > the module to use its constants. I agree however that being useable in > guards is a good point. PRs are always welcome. > > Regarding allowing non-integer values, I do not know if it makes much > sense. The entire point of defining constants this way is to be able to > interface with external services/serialization. If you can use Elixir terms > then you probably do not need this. Or am I missing something? > > On Tuesday, August 30, 2016 at 5:14:19 PM UTC+3, OvermindDL1 wrote: >> >> I actually do use a lot of `defmacro something, do: 42` for enums >> operating with a remote system, this would be convenient. :-) >> >> Have you thought about making it a macro (be sure to escape the return in >> case they want the value to be a tuple or so), that way it can be used in >> more areas and in matching? >> >> On Monday, August 29, 2016 at 11:52:44 PM UTC-6, Michele Balistreri wrote: >>> >>> Hi all, >>> >>> after reading the topic at >>> http://stackoverflow.com/questions/33851536/how-do-you-define-constants-in-elixir-modules >>> >>> I decided to use the approach taken by wxErlang. I found this to be a >>> little verbose, especially since I also needed a list of all constants and >>> an easy way to convert from the integer value to the associated atom. >>> >>> So I created the const package, which allows you to write this: >>> >>> defmodule Status do >>> use Const, [:queued, :processed, :sent] >>> end >>> >>> and obtain this >>> >>> defmodule Status do >>> def queued, do: 0 >>> def processed, do: 1 >>> def sent, do: 2 >>> def all, do: [queued: 0, processed: 1, sent: 2] >>> def by_value(val) do >>> # returns the atom from the integer value. In case of duplicated >>> values, the fist >>> # associated atom is returned >>> end >>> end >>> >>> You can also give a keyword list if you need specific values, and even a >>> list where some elements are just atoms and some are tuples. The behavior >>> in this case will be like for C enums. >>> >>> More details at: https://github.com/bitgamma/const >>> >>> Hope it can be useful! >>> >>> Regards, >>> Michele Balistreri >>> Bitgamma OÜ >>> >> -- You received this message because you are subscribed to the Google Groups "elixir-lang-talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to elixir-lang-talk+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-talk/1c396e2c-3156-4b25-ad36-d8b5280ad7c5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
