<jabb>
for the sake of style, would you say control should be CTRL or Ctrl?
<jabb>
IF i were to shorten it
<Papierkorb>
Shorten for what? For e.g. showing a key combo in a help page?
<jabb>
for code
<jabb>
enumeration
<Papierkorb>
so an identifier for use in code?
<jabb>
yes
<Papierkorb>
CTRL would indicate to most an abbreviation (with each character meaning a whole word), which CTRL is not, so Ctrl.
<Papierkorb>
or `ctrl` if it's a method or variable
<jabb>
thats what i was thinking
<Papierkorb>
Though I'd never use CTRL, for me it'd be `Ctrl` even if every char would expand to a whole word, never liked that style
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<jabb>
can you have uninitialized struct data
<jabb>
"property x = uninitialized Int32"
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<Papierkorb>
No
<Papierkorb>
(Or, it would surprise me)
<Papierkorb>
jabb: What do you need it for?
<jabb>
delayed initialization
<jabb>
if it's a fairly large struct it would just be a gigantic new() call
<Papierkorb>
Use the yielding version of the `getter` macro: `getter expensive : Int32 do 1 + 2 end` will call the block once on-demand, and memoize the value
<Papierkorb>
Or, use nilable values
<Papierkorb>
You can use `property!` to build a non-nil getter
<Papierkorb>
Well, `getter!` exists too
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<sija>
@jabb actually you can, although it'll not work with `property/getter/setter` macros
<jabb>
sija: how do you do it?
<sija>
`@x = uninitialized Int32`
<jabb>
what's the purpose of a propery macro?
<jabb>
why not just use @x?
<sija>
these macros create methods to access such variable
<jabb>
i thought you can access instance variables already
<sija>
not outside of the class, no (except undocumented and test-only foo.@x notation)
<jabb>
i have enum Foo : UInt8, and i have a variable x : UInt8
<sija>
Foo.new(x)
<jabb>
gotcha, just saw that
<jabb>
ty
<sija>
cheers
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<jabb>
instead of asserting, just raise?
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<crystal-gh>
[crystal] kostya opened pull request #4081: use GC.malloc_atomic to allocate objects without pointers (master...gc_atomic) https://git.io/vykfu
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<jaitaiwan>
Hey fam, just wanted to say I'm really excited about the direction crystal is heading.
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<FromGitter>
<sdogruyol> @jaitaiwan yeah, we are too :)
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<FromGitter>
<schoening> @sdogruyol is there a way to make a request to an external api server?
<FromGitter>
<dreyks> @schoening does `HTTP::Client` fit your needs?
<FromGitter>
<schoening> I bet it does. I am gonna read through the api
<FromGitter>
<schoening> thx @dreyks
<FromGitter>
<schoening> Well... yeah, looks like it does. Ugh, why didn't i look first, then ask -_-'
<FromGitter>
<dreyks> :smile:
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<crystal-gh>
[crystal] ysbaddaden opened pull request #4082: Fix: Check return pointer of LLVMGetStructName [#4078] (master...fix-llvm-type-get-struct-name-segfault) https://git.io/vykW7
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<FromGitter>
<l3kn> @jabb I think the difference would be that assert only has an effect when compiled in some debug mode
<Papierkorb>
Does someone know where the compiler figures out which methods to compile (with which argument types), and then actually builds them?
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<FromGitter>
<Dohxis> Hello, I am a new guy on Crystal community just started to learn the language, it looks really nice. Maybe someone could help with tutorials?
<Papierkorb>
Dohxis, just ask
<FromGitter>
<Dohxis> I am not looking for any specific thing just the overall tutorial to begin with the language,
<FromGitter>
<tekjar> Hi. How do I add unit tests to my library? Can someone pls point me to some docs/blogs
<Papierkorb>
tekjar, look into spec/
<Papierkorb>
has been auto-generated for you if you used `crystal init`
<FromGitter>
<tekjar> Hi. How to print `Bytes` in hex format on console? I'm not sure how to figure out these details from docs
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<Papierkorb>
tekjar, in the link I gave you, click on the resulting type "Bytes", you'll see it's an alias for Slice. Click `Slice`. Now Ctrl-F "hex" and search the doc page.
<FromGitter>
<tekjar> Papierkorb: Ahh thanks alot
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<rt_>
Hi. How do I convert Bool to UInt8?
<rt_>
There seems to be no to_u8 method for Bool
<RX14>
rt_, why do you want to do that?
<rt_>
I need to write a u8 to IO based on flag status.
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<rt_>
Spec says that I should write 0 for false and 1 for true
<RX14>
well i'd typically go for the simple solution
<RX14>
bool ? 1 : 0
<rt_>
Oh cool. I forgot that it is an expression
<rt_>
Still
<rt_>
to_u8 might look better :)
<RX14>
well, I think associating bool with 1/0 is outdated
<Papierkorb>
lazy hack is using Bool#hash .. which may change and then your code breaks :D
<RX14>
(don't do that)
<rt_>
Ohh. Ok
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<Papierkorb>
Does Crystal still support LLVM3.5?
<Papierkorb>
Wasn't that the one producing broken code in --release mode?
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<FromGitter>
<fazibear> Hi, any ideas how to convert ["a", "b"] to char** ?
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<Papierkorb>
fazibear, `args = ["a", "b"]; LibFoo.do_it(args.map(&.to_unsafe).to_unsafe)` - The `args` array must be kept alive by you until it's not used anymore.
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<sija>
`["a", "b"].map &.at(0)`
<sija>
ah, i misread your q, sorry
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<fazibear>
thanks! Works great
<fazibear>
One more question: How to cast Pointer(Void) to Float ?
<fazibear>
that was easy: .as(Pointer(Float64))
<Papierkorb>
you can also write `.as(Float64*)`
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<fazibear>
got problems with allocating array with one element ?
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<VectorGraphics>
Hey, is it possible to use Process.run() concurrently? Would that work in a fiber?
<RX14>
VectorGraphics, what do you mean by concurrently?
<RX14>
there's process.new which starts the process and returns a handle
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<RX14>
and process.run which starts a process and blocks until it's done
<RX14>
neither of them block the whole application
<RX14>
just the current fiber
<VectorGraphics>
I'll check out process.new. I have some long-running commands that I want to execute and not have the application wait while other things are happening
<RX14>
it might turn out easiest to coordinate using channels and fibers though
<VectorGraphics>
I didn't know about channels yet. Thank you
<RX14>
thing with Process.new is you can't select on it yet
<RX14>
(yet)
<RX14>
actually you probably can
<RX14>
could*
<RX14>
with a bit of stdlib weaking
<RX14>
but thats advanced~
<VectorGraphics>
What do you mean select on it?
<RX14>
basically you provide a set of calls which block
<RX14>
and the first one which would return is used
<RX14>
for example
<RX14>
select; when foo = file.read; when file.write(bar); end
<RX14>
thats not how files work at all but you get the idea
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<VectorGraphics>
Ah
<VectorGraphics>
I don't think I'll be doing quite that. I'm basically exploring what it would take to have a queue (array) with commands, and then have the system run each command as it can handle them via process. Once those are ready to return, their result would be processed further by the application and stored somewhere
<RX14>
basically take an array of commands and execute them in parallel?
<VectorGraphics>
Yeah
<RX14>
the simplest way would be array.map { |command| Process.new(command) }.each { |process| process.wait }
<RX14>
but that executes them all at the same time
<RX14>
no parallelism limit
<VectorGraphics>
Cool
<RX14>
with a large array you'd just swamp the scheduler with processes
<VectorGraphics>
That makes sense
<RX14>
otherwise i'd spawn N fibers, then have a queue
<RX14>
each fiber would pull a command, use Process.run on it
<RX14>
push the result to an array
<RX14>
then you'd push to a channel after every command finishes
<RX14>
then call recieve commands.size times in the "main" fiber
<FromGitter>
<dreyks> when you say "pull a command" is this also a receive?
<RX14>
yeah that would work... maybe
<RX14>
actually you'd probably have problems with unbuffered channels with that
<RX14>
get into a dreaded deadlock
<RX14>
you'd actually take your list of commands and take n random slices
<RX14>
each slice (Enumberable#slice, not to be confused with Slice) would then be a normal array