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digitalmars.D.learn - Two-dimensional slices in D

reply "Dennis Ritchie" <dennis.ritchie mail.ru> writes:
Hi,
Is it possible to somehow shorter turn to slice on D? Maybe you 
can use tuples?


-----
printfn "%A" xs.[4 .. 7, 4 .. 9]
-----

D:
-----
writeln([a[4][4 .. $], a[5][4 .. $], a[6][4 .. $], a[7][4 .. $]]);
-----


-----
let xs = Array2D.init 10 10 (fun x y -> x * 10 + y)
printfn "[4 .. 7, 6 .. 9] = \n%A" xs.[4 .. 7, 4 .. 9]
-----
http://ideone.com/jjWlXQ

D:
-----
import std.stdio;

void main() {
	
	auto a = [
		[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
		[10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
		[20, 21, 22, 23, 24, 25, 26, 27, 28, 29],
		[30, 31, 32, 33, 34, 35, 36, 37, 38, 39],
		[40, 41, 42, 43, 44, 45, 46, 47, 48, 49],
		[50, 51, 52, 53, 54, 55, 56, 57, 58, 59],
		[60, 61, 62, 63, 64, 65, 66, 67, 68, 69],
		[70, 71, 72, 73, 74, 75, 76, 77, 78, 79],
		[80, 81, 82, 83, 84, 85, 86, 87, 88, 89],
		[90, 91, 92, 93, 94, 95, 96, 97, 98, 99]
	];

	foreach (i; 4 .. 8)
		writeln(a[i][4 .. $]);

     /*	[44, 45, 46, 47, 48, 49]
	[54, 55, 56, 57, 58, 59]
	[64, 65, 66, 67, 68, 69]
	[74, 75, 76, 77, 78, 79]  */

	writefln("[%([%(%s, %)]%|\n %)]", [a[4][4 .. $], a[5][4 .. $], 
a[6][4 .. $], a[7][4 .. $]]);

     /* [[44, 45, 46, 47, 48, 49]
	[54, 55, 56, 57, 58, 59]
	[64, 65, 66, 67, 68, 69]
	[74, 75, 76, 77, 78, 79]] */
}
-----
http://ideone.com/ACOcHJ
Apr 14 2015
next sibling parent reply "Ivan Kazmenko" <gassa mail.ru> writes:
On Tuesday, 14 April 2015 at 14:21:41 UTC, Dennis Ritchie wrote:

 	writefln("[%([%(%s, %)]%|\n %)]", [a[4][4 .. $], a[5][4 .. $], 
 a[6][4 .. $], a[7][4 .. $]]);


At least this can be done as
-----
writefln("[%([%(%s, %)]%|\n %)]", a[4..8].map !(b => b[4 .. $]));
-----
Apr 14 2015
parent "Dennis Ritchie" <dennis.ritchie mail.ru> writes:
On Tuesday, 14 April 2015 at 15:16:10 UTC, Ivan Kazmenko wrote:

 On Tuesday, 14 April 2015 at 14:21:41 UTC, Dennis Ritchie wrote:

 	writefln("[%([%(%s, %)]%|\n %)]", [a[4][4 .. $], a[5][4 .. 
 $], a[6][4 .. $], a[7][4 .. $]]);


 At least this can be done as
 -----
 writefln("[%([%(%s, %)]%|\n %)]", a[4..8].map !(b => b[4 .. 
 $]));
 -----


Thanks.

On Tuesday, 14 April 2015 at 17:27:15 UTC, Ali Çehreli wrote:

 On 04/14/2015 07:21 AM, Dennis Ritchie wrote:



 -----
 printfn "%A" xs.[4 .. 7, 4 .. 9]
 -----


 D supports that syntax as well:

   http://dlang.org/operatoroverloading.html#slice

 I have a simple example here:


 http://ddili.org/ders/d.en/templates_more.html#ix_templates_more.multi-dimensional%20operator%20overloading

 Ali


Yes, now I understand. Thanks.
Apr 14 2015
prev sibling parent =?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:
On 04/14/2015 07:21 AM, Dennis Ritchie wrote:



 -----
 printfn "%A" xs.[4 .. 7, 4 .. 9]
 -----


D supports that syntax as well:

   http://dlang.org/operatoroverloading.html#slice

I have a simple example here:

 
http://ddili.org/ders/d.en/templates_more.html#ix_templates_more.multi-dimensional%20operator%20overloading

Ali
Apr 14 2015