crystal-lang/crystal

The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/

stellarpower

@stellarpower

^^ I want it to be compil;e-time though

I think a parent class' constructor is being called when I want a compile error, in this case

George Dietrich

@Blacksmoke16

private def self.new?

stellarpower

@stellarpower

YEah that would do it, thanks

Make it private, the old ways.

George Dietrich

@Blacksmoke16

:thumbsup:

stellarpower

@stellarpower

Why did I not think of that haha

I think = delete only came in C++11

Maybe I Can make itnot compile actually, cause methods are a bit like generics in other languages right, the actual code is only really ocmpiled at the point they are used, because you can;t know how the types will filter through

I could presumably force an error in somehow to make sure it isn;t called

OR, rather, it doesn;t compile, with a message that then means I fix it

Although for a cponstructor now I would need to instantiate all my members or they become nillable

stellarpower

@stellarpower

So, it also now seems to be locking up reading from a channel

Surely that will return ontrol to other fibers right?

stellarpower

@stellarpower

Somnehoe looks that replacing receive with receive?has made a difference, but I'm not sure why..

https://github.com/GeopJr/non-blocking-spawn#purpose

This may also be relevant

George Dietrich

@Blacksmoke16

might be a good use case for select?

then could like wait specific amount of time, or fallthru if nothing is waiting to be recieved etc

stellarpower

@stellarpower

Should there be any conceptual differences between select and just calling receive for a single channel?

stellarpower

@stellarpower

Think the threading is finally working, I was hitting a bit of a nasty silent issue with my other code

George Dietrich

@Blacksmoke16

https://lbarasti.com/post/select_statement/

stellarpower

@stellarpower

I give up, it's just back to hanging now

I feel like any attempts to make threading easier just take away control and leave things broken. If I could just make threads and use mutices this would probably get easier

stellarpower

@stellarpower

urhg finally okay

I was writing to a channel before actually entering the event loop.

I thought that should return immediately but evidently it was hanging

Is Channel capacity automatic? I.e. it defaults to a sensible value if not given explicitly

George Dietrich

@Blacksmoke16

afaik channels dont have a limit unless you create them with one

From IRC (bridge bot)

@FromIRC

<yxhuvud> if they don't have a limit they will always wait until the other side is ready though.

stellarpower

@stellarpower

Right, okay. I thought I must have tried it before and it worked, but maybe I was wrong.

From IRC (bridge bot)

@FromIRC

<riza> typically if you want to expand the ~ or . / .., you need to use a special function to expand them

<riza> eg https://crystal-lang.org/api/1.4.0/Path.html#expand(base:Path|String=Dir.current,*,home:Path|String|Bool=false,expand_base=true):Path-instance-method

George Dietrich

@Blacksmoke16

Path["~/some/project"].expand home: true would do what you want

From IRC (bridge bot)

@FromIRC

<riza> i think the default behavior of home is true as well

George Dietrich

@Blacksmoke16

Naw it's false by default

From IRC (bridge bot)

@FromIRC

<riza> thats interesting... and it might well be the cause of a bug or two I've been living with for quite some time

Benjamin Clos

@ondreian

The false behavior bit me on an upgrade a week ago

Error: no overload matches 'Room::Sane.new', lich_id: UInt64, uid: Int64, title: Array(String), description: Array(String), paths: Array(String), tags: Array(String), wayto: Hash(String, String), timeto: Hash(String, Float32 | String), location: String

Overloads are:
 - Room::Sane.new(lich_id : ::UInt64, uid : ::UInt64, title : ::Array(::String), description : ::Array(::String), paths : ::Array(::String), tags : ::Array(::String), wayto : ::Hash(::String, ::String), timeto : ::Hash(::String, ::Float32 | ::String), location : ::String)

i'm not quite sure what's going on here why the are prefixed with ::? Does this have the same meaning as Ruby?

From IRC (bridge bot)

@FromIRC

<riza> I can't see it in gitter for some reason

<riza> oh you didn't post the code, just the error

<riza> you're passing in uid as an i64 but your overload wants an ui64

<riza> method signature says: uid: Int64, overload says: uid : ::UInt64

<riza> don't worry about teh prefix ::

George Dietrich

@Blacksmoke16

what does false behavior have to do with that error?

From IRC (bridge bot)

@FromIRC

<riza> i think that error is unrelated to the false behavior

George Dietrich

@Blacksmoke16

the :: prefix basically means like "top level reference"

can also be used with methods. E.g. say you added your own raise method but still want to call the default one, could do ::raise "oh no"

Benjamin Clos

@ondreian

ah yeah, thanks, end of the day error. And I appreciate confirming the meaning of ::

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