• =?iso-8859-1?Q?Robert_M._M=FCnch?= (10/10) May 25 2019 How can I reset a rectangualr array without having to loop through it?
• matheus (15/22) May 25 2019 This works form me:
• =?iso-8859-1?Q?Robert_M._M=FCnch?= (7/16) May 25 2019 My question was unprecise: I want to keep the first dimension and only
• 9il (2/16) May 27 2019 myRectData[] = null;
• =?iso-8859-1?Q?Robert_M._M=FCnch?= (6/7) May 28 2019 :-/ Ok... doesn't look to complicated ;-) Still learning a lot about D.....
• Steven Schveighoffer (10/16) May 28 2019 Keep in mind, this does not reuse the allocated arrays, it simply resets...

=?iso-8859-1?Q?Robert_M._M=FCnch?= <robert.muench saphirion.com> writes:

How can I reset a rectangualr array without having to loop through it?

int[][] myRectData = new int[][](10,10);

myRectData.length = 0;
myRectData[].length = 0;		
myRectData[][].length = 0;	

They all give: slice expression .. is not a modifiable lvalue.

-- 
Robert M. Münch
http://www.saphirion.com
smarter | better | faster

matheus <matheus gmail.com> writes:

On Saturday, 25 May 2019 at 14:28:24 UTC, Robert M. Münch wrote:
 How can I reset a rectangualr array without having to loop 
 through it?

 int[][] myRectData = new int[][](10,10);

 myRectData.length = 0;
 myRectData[].length = 0;		
 myRectData[][].length = 0;	

 They all give: slice expression .. is not a modifiable lvalue.

This works form me:

//DMD64 D Compiler 2.072.2
import std.stdio;

void main()
{
     auto arr = new int[][](10,10);
     writeln(arr.length);
     arr.length=0;
     writeln(arr.length);
}

output:
10
0

Matheus.

=?iso-8859-1?Q?Robert_M._M=FCnch?= <robert.muench saphirion.com> writes:

On 2019-05-25 14:28:24 +0000, Robert M. Münch said:

 How can I reset a rectangualr array without having to loop through it?
 
 int[][] myRectData = new int[][](10,10);
 
 myRectData.length = 0;
 myRectData[].length = 0;		
 myRectData[][].length = 0;	
 
 They all give: slice expression .. is not a modifiable lvalue.

My question was unprecise: I want to keep the first dimension and only 
reset the arrays of the 2nd dimension. So that I can append stuff again.

-- 
Robert M. Münch
http://www.saphirion.com
smarter | better | faster

9il <ilyayaroshenko gmail.com> writes:

On Saturday, 25 May 2019 at 16:17:40 UTC, Robert M. Münch wrote:
 On 2019-05-25 14:28:24 +0000, Robert M. Münch said:

 How can I reset a rectangualr array without having to loop 
 through it?
 
 int[][] myRectData = new int[][](10,10);
 
 myRectData.length = 0;
 myRectData[].length = 0;		
 myRectData[][].length = 0;	
 
 They all give: slice expression .. is not a modifiable lvalue.

 My question was unprecise: I want to keep the first dimension 
 and only reset the arrays of the 2nd dimension. So that I can 
 append stuff again.

myRectData[] = null;

=?iso-8859-1?Q?Robert_M._M=FCnch?= <robert.muench saphirion.com> writes:

On 2019-05-28 01:52:28 +0000, 9il said:

 myRectData[] = null;

:-/ Ok... doesn't look to complicated ;-) Still learning a lot about D...

-- 
Robert M. Münch
http://www.saphirion.com
smarter | better | faster

Steven Schveighoffer <schveiguy gmail.com> writes:

On 5/28/19 4:58 PM, Robert M. Münch wrote:
 On 2019-05-28 01:52:28 +0000, 9il said:
 
 myRectData[] = null;

 
 :-/ Ok... doesn't look to complicated ;-) Still learning a lot about D...
 

Keep in mind, this does not reuse the allocated arrays, it simply resets 
them to point at nothing (and will need to be reallocated).

To reset the way you want, you need a loop:

foreach(ref arr; myRectData)
{
    arr.length = 0;
    arr.assumeSafeAppend;
}

-Steve