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Philippe,<br>
I don't understand the example below to simulate the list
comprehension syntax. Are input1, input2 and input3 ranges? Where
is the comp function defined?<br>
Thank you,<br>
-clk<br>
(Christian Keppenne)<br>
<pre wrap="">auto lc = comp!("tuple(a,b,c)", "a*a+b*b == c*c && a<b")(input1,input2, input3);</pre>
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<blockquote
cite="mid:mailman.6869.1324482902.24801.digitalmars-d-learn@puremagic.com"
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Message: 2
Date: Tue, 20 Dec 2011 21:45:26 +0100
From: Philippe Sigaud <a class="moz-txt-link-rfc2396E" href="mailto:philippe.sigaud@gmail.com"><philippe.sigaud@gmail.com></a>
To: "digitalmars.D.learn" <a class="moz-txt-link-rfc2396E" href="mailto:digitalmars-d-learn@puremagic.com"><digitalmars-d-learn@puremagic.com></a>
Subject: Re: newbie question: Can D do this?
Message-ID:
<a class="moz-txt-link-rfc2396E" href="mailto:CAOA6Bi6BaYm1T3PhvWY9mBRPsedK_dDjWYr-7yDO5cOV2ddiTw@mail.gmail.com"><CAOA6Bi6BaYm1T3PhvWY9mBRPsedK_dDjWYr-7yDO5cOV2ddiTw@mail.gmail.com></a>
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On Mon, Dec 19, 2011 at 17:17, clk <a class="moz-txt-link-rfc2396E" href="mailto:clk@clksoft.com"><clk@clksoft.com></a> wrote:
</pre>
<pre wrap="">
Correct. As other have said, it's doable by combining std functions.
As fas as I know, we do not have a cartesian product range, to iterate
on all combinations of two or more ranges.
[f(x,y) for x in list1 for y in list2 if condition]
I gave it a try a few years ago and could get something like this:
auto lc = comp!("tuple(a,b,c)", "a*a+b*b == c*c && a<b")(input1,
input2, input3);
-> mapper, condition,
input ranges, as many as you wish
But at the time I couldn't find a way to do bindings, that is:
[f(x,y) for x in [0..10] for y in [0..x]]
-> the range iterated by y depends on x.
If anyone has an idea, I'm game.
Philippe
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