[Issue 8715] zipWith

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http://d.puremagic.com/issues/show_bug.cgi?id=8715



--- Comment #4 from bearophile_h...@eml.cc 2012-10-12 16:22:58 PDT ---
(In reply to comment #3)

 (map already accepts a struct with an appropriate constructor as that
 fits the 'callable' definition.)

Right. But this shows a different limit. I think code like this is accepted in
Clojure:


import std.algorithm: map;
void main() {
auto keys = [1, 2, 1, 1, 1];
auto a = [0, 10, 20];
auto r1 = map!(k = a[k])(keys); // OK
auto r2 = map!a(keys);   // Error
auto aa = [1: 10, 2: 20];
auto r3 = map!(k = aa[k])(keys); // OK
auto r4 = map!aa(keys);   // Error
}

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[Issue 8715] zipWith

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http://d.puremagic.com/issues/show_bug.cgi?id=8715


timon.g...@gmx.ch changed:

   What|Removed |Added

 CC||timon.g...@gmx.ch


--- Comment #1 from timon.g...@gmx.ch 2012-09-23 16:34:39 PDT ---
I suggest to add anything that is not yet there and applicable to ranges listed
here up to and excluding 'special lists':

http://www.haskell.org/ghc/docs/latest/html/libraries/base/Data-List.html

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[Issue 8715] zipWith

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http://d.puremagic.com/issues/show_bug.cgi?id=8715



--- Comment #2 from bearophile_h...@eml.cc 2012-09-23 17:48:57 PDT ---
A simpler alternative idea is to just extend zip() to optionally accept a
function/constructor (it's also good for map() to accept a struct name):

import std.range;
void main() {
auto r1 = zip!q{a + b}([1,2,3], [10,20,30]);
static struct Vec { int x, y; }
auto r2 = zip!Vec([1,2,3], [10,20,30]);
}

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[Issue 8715] zipWith

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http://d.puremagic.com/issues/show_bug.cgi?id=8715



--- Comment #3 from timon.g...@gmx.ch 2012-09-23 18:04:46 PDT ---
(In reply to comment #2)
 A simpler alternative idea is to just extend zip() to optionally accept a
 function/constructor (it's also good for map() to accept a struct name):
 
 import std.range;
 void main() {
 auto r1 = zip!q{a + b}([1,2,3], [10,20,30]);
 static struct Vec { int x, y; }
 auto r2 = zip!Vec([1,2,3], [10,20,30]);
 }

I prefer this. 'zip' would become 'zipWith' with a default template argument of
'tuple'. (map already accepts a struct with an appropriate constructor as that
fits the 'callable' definition.)

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