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/

Bar Hofesh

@bararchy

or is it only for types ?

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@FromIRC

<Groogy> Morning!

<Papierkorb_> Morning

<Papierkorb_> @bararchy, only type aliases. Method aliases are frowned upon. If you meant a delegator, you can use the delegate macro delegate foo, bar, baz, to: @something

Bar Hofesh

@bararchy

I just want to have two names for the same method , let's say I have .destory, and I want it to respond to .close too, and doing

def close
  destory
end

is a little ugly

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<Groogy> huh what does the delegate macro do exactly? Not seen that before

<Groogy> also @bararchy a good question would be why do you want two symbols to correspond to the same functionality?

Bar Hofesh

@bararchy

so that I can conform with the original lib, and also the languge standards

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<Groogy> #destroy is sometihng I usually associate with resources while #close would be something like IO or a window

<Groogy> ah

<Yxhuvud> groogy: it forwards a method call to whatever it delegates to

<Groogy> so it would forward foo.bar to @something.bar?

<Groogy> foo.@something.bar

<Papierkorb_> yes

<Papierkorb_> @bararchy, it looks ugly because aliases are ugly

<Papierkorb_> Ruby has been burnt by it, its stdlib is full of aliases. It sucks.

<Yxhuvud> I kinda like it. YMMV.

Bar Hofesh

@bararchy

is there a way I can know if an object is being called from the main Fiber or from another spawn ?

Bar Hofesh

@bararchy

So, started working on TensorFlow bindings for Crystal, if anyone want's to join in: https://github.com/NeuraLegion/tensorflow.cr, it's MIT licensed ofc

imonmyown

@imonmyown

@bararchy not sure I can be of help, but if I can let me know how

sorry, didn't get to Contributing section

Bar Hofesh

@bararchy

:) @imonmyown you can see what is under development, just pick something you want to add, see the referances, and PR

imonmyown

@imonmyown

Ok, got it :)

imonmyown

@imonmyown

I don't seem to be able to assign to an element of a newly allocated array

    prefix = Array(Int32).new(arr.size.as Int)
    prefix[0] = 1

Getting Index out of bounds...

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<Papierkorb_> As expected. That array is empty. Though your snippet looks like you can #map from it. Otherwise, you can set the initial value to pre-fill the array to the given size.

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<jokke> i was just playing around with crystal to expose c functions to create dynamic libraries

<jokke> for c

<jokke> but i ran into my first problem: crystal redefines main

<jokke> can i circumvent this?

<jokke> Papierkorb_: your into this low level stuff, any ideas? :⁠)

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<Papierkorb_> jokke: It has since been broken, the empty prelude began to ship with a fun main recently. There's also now way (afaik) to remove a fun after defining it somewhere. You can get around this by carefully writing a custom prelude which doesn't require anything defining the main()

<Papierkorb_> jokke: Got it.

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<Papierkorb_> Hang on..

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<Papierkorb_> jokke: https://gist.github.com/Papierkorb/02d6ba53c28b5035a80bf7695f4706bb

<Papierkorb_> Have a look at the real main implementation however, as you'll want to start the garbage collector etc.

Ary Borenszweig

@asterite

We can probably have a flag to not generate main, for example NO_MAIN. But dynamic libraries are very limited right now. For example is_a? won't work well.

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<Papierkorb_> @asterite, I think that would be a useful thing to have. Not for the many, but for the some :⁠)

<Papierkorb_> No idea about embedded systems, but I can imagine those needing some early configuration before the C code would jump into Crystal-land (and thus, its main)

Ghost

@ghost~55586c4815522ed4b3e08557

Nice gist Papierkorb!

What do you mean by removing a fun after its definition? How?

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<Papierkorb_> @bew, there's noundef_fun functionality in the language (or the like), which would let you to get rid of the main().

<Papierkorb_> Not that I want that feature, a --no-main or --flag NO_MAIN would be ideal

<jokke> yeah that'd be great

<jokke> and also easy to implement

<Papierkorb_> custom flags would be kinda neat though cough

<jokke> well you could just use NO_MAIN=1 ...

Ghost

@ghost~55586c4815522ed4b3e08557

Oh okay I understood there was a way (you said "there's now way" instead of "no way"! )

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<jokke> and then {% if env("NO_MAIN") %}

<jokke> or something similar

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