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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    yosh‏ @yoshuawuyts 27 Jul 2019
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    I guess the visitor pattern is a nice placeholder for anonymous iterators until we get generators. First saw this in @KodrAus's kv log code. But now also using it for my own work! pub fn visit(&self, visitor: &mut impl FnMut(&str)); Internally call visit for each item!

    2:04 PM - 27 Jul 2019
    • 4 Likes
    • Ashley Mannix substack rektide de la fay
    2 replies 0 retweets 4 likes
      1. yosh‏ @yoshuawuyts 27 Jul 2019
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        I've known about the visitor pattern for a while btw. It's just that I've never thought of them as a replacement for anon iterators. The other way around is true too: once anon iters land there's less need for visitors. Only if you need the fn to be executed in the caller contxt

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      2. Ashley Mannix‏ @KodrAus 28 Jul 2019
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        Replying to @yoshuawuyts

        In log we use something like: pub fn visit(&’a self, visitor: &mut impl FnMut(&’a str)); That little lifetime, ‘a, constrains what you can visit but lets you write methods like: pub fn get(&’a self, key: Key) -> Option<&’a Value>; based purely on the visit API.

        2 replies 0 retweets 1 like
      3. yosh‏ @yoshuawuyts 28 Jul 2019
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        Replying to @KodrAus

        Oh that's awesome, thanks for sharing! Thinking out loud here, but I wonder it lifetime elision would also work here, e.g. simplifying it further to: pub fn visit(&self, visitor: &mut impl FnMut(&'_ str)); Should try this out when I'm behind a computer again I guess ^__^.

        0 replies 0 retweets 1 like
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