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/

Philippe Nénert

@papilip

gyhave a goog day

Serdar Dogruyol - Sedo セド

@sdogruyol

thank you :smile:

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@FromIRC

<Papierkorb_> Hi sdogruyol!

Bar Hofesh

@bararchy

I hate C bindings

hahaha

Ghost

@ghost~55586c4815522ed4b3e08557

@bararchy why? ˆˆ

@oprypin good catch, thanks

Bar Hofesh

@bararchy

@bew working on getting crystal-fann to support Float64 instead of Float32, the underlying C lib gives me trubles and I don't really know why :\
NeuraLegion/crystal-fann#6

so annoying :(

Ghost

@ghost~55586c4815522ed4b3e08557

Ah, no idea how I could help, I don't understand anything about what you'r doing! :joy:

Bar Hofesh

@bararchy

lol, it's just something stupid , I guess I need something to be a float ...

Is there a way to automagiclly cast Array(Float64) to Array(Float32) ?

Ghost

@ghost~55586c4815522ed4b3e08557

With a map?

You can't automagically do that

Plus, I think you need to save the generated array before sending it to the lib (to prevent it being collected by the gc while in us in the lib)

Bar Hofesh

@bararchy

Something I would really like in specs, it to have a

on_fail do 
  puts debug_info
end

this way I don't need to just print stuff out if I dont need it

only if specs fails

Rubi

@codenoid

btw,

puts "slay"
exit 0
at_exit { puts "bye" }

why at_exit should be above exit

Serdar Dogruyol - Sedo セド

@sdogruyol

you call exit before declaring at_exit

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@FromIRC

<oprypin> @codenoid, at_exit is a method. in your example it's never called

Rubi

@codenoid

but, "I will do at_exit, when I exit " :/ :+1:

Serdar Dogruyol - Sedo セド

@sdogruyol

why not moving at_exit line up?

Rubi

@codenoid

I am just asking :shipit:

Bar Hofesh

@bararchy

@codenoid you can also

def foo
  bla
  bla
  exit
rescue SystemExit
  do stuff here
end

I wouldn't do that, but it's a posibilty

Ghost

@ghost~55586c4815522ed4b3e08557

Huh

Not in Crystal

Bar Hofesh

@bararchy

wouldn't work ?

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@FromIRC

<oprypin> undefined constant SystemExit

Ghost

@ghost~55586c4815522ed4b3e08557

Exit doesn't raise an exception

Bar Hofesh

@bararchy

Oh..

Ghost

@ghost~55586c4815522ed4b3e08557

It simply exits!

Bar Hofesh

@bararchy

In Ruby this:

def test
  exit
rescue Exception => e
  puts e, e.class
end

test

Returns this:

exit
SystemExit

So I guess in this regard it's not comptabile

@codenoid Sorry for misleading

Rubi

@codenoid

no problem @bararchy , thanks for sharing :sparkles:

Paul Smith

@paulcsmith

Is there a way to rescue compile time errors in order to provider more info to the user? I've found that in some of the libraries I'm writing the compile time errors would be a lot more helpful with a little more info. So instead of something like "must return LuckyWeb::Response not WhateverType" it could say that and "that usually means you need to call render or redirect at the end of your action"

From IRC (bridge bot)

@FromIRC

<oprypin> @paulcsmith, no u cant rescue, but maybe u can anticipate those cases and make them nonfatal but with a manual {% raise "" %} in them

<oprypin> needs an example to say more

<oprypin> if return_result.is_a? LuckyWeb::Response; good stuff; else; {% raise

Paul Smith

@paulcsmith

@oprypin thanks for the suggestion. Here's a more thorough example: https://gist.github.com/paulcsmith/3282626b39c0ba626db3e135bc1a66a2

Does that make more sense now? render and redirect both return a LuckyWeb::Response

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@FromIRC

<oprypin> @paulcsmith, nah has to be a runnable exammple

Paul Smith

@paulcsmith

Ok one sec. I"ll try to put something together

From IRC (bridge bot)

@FromIRC

<oprypin> i suspect that action has like &block : -> LuckyWeb::Response

<oprypin> in which case add another one with &block : -> _ that has {% raise "foo" %} as its body

<oprypin> also # :nodoc: it. not sure if it's worth it tho

Paul Smith

@paulcsmith

@oprypin https://play.crystal-lang.org/#/r/2t8s is a runnable example

In this case it's fairly clear you need render but in the framework it's less clear what a LuckyWeb::Response is since you never directly instantiate it. You always use render/redirect/etc.

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