#ponylang on 2016-09-05 — irc logs at freenode.irclog.whitequark.org

2016-03-17 19:44 jemc changed the topic of #ponylang to: Welcome! Please check out our Code of Conduct => https://github.com/ponylang/ponyc/blob/master/CODE_OF_CONDUCT.md | Public IRC logs are available => http://irclog.whitequark.org/ponylang

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00:52 <mankyKitty> so much win when that happens, apart from just general warm and fuzzies

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11:55 <srdjan_> hi all

11:55 <srdjan_> I have a question about a feature/bug in pony.

11:56 <srdjan_> the following program does not compile:

11:56 <srdjan_> actor Main new create(env: Env) => let f = lambda()(this) => None end

11:56 <srdjan_> I get the following error message: actor Main new create(env: Env) => let f = lambda()(this) => None end

11:57 <srdjan_> I get the following error message: Error: /home/d063142/prog/pony/print/main.pony:4:22: syntax error: expected capture after ( let f = lambda()(this) =>

11:57 <srdjan_> Is it possible to capture 'this' in lambda?

11:58 <srdjan_> On the other hand, the following program compiles correctly: actor Main new create(env: Env) => let t : Main = this let f = lambda()(t) => None end

11:58 <srdjan_> So, when I assing 'this' to 't', I am able to capture 'this'?

11:59 <srdjan_> What is expected behavior?

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21:24 <doublec> srdjan_: did you resolve your problem?

21:24 <doublec> srdjan_: I don't think you can capture 'this' that way - I've encountered it too.

21:25 <doublec> srdjan_: this is probably a keyword

21:25 <doublec> srdjan_: maybe try: let f = lambda()(t = this) ...

21:42 <Praetonus> Capturing `this` as is in a lambda is probably impossible because a lambda is an object and therefore `this` doesn't refer to the parent object when defining a lambda

21:43 <Praetonus> But this is a quite terrible error message. I think it can be improved easily

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