• Frank Benoit (keinfarbton) (8/8) Jan 09 2007 TypeA[] ta = .... ; // big array with something
• Lionello Lunesu (2/12) Jan 09 2007 type[] t = void;
• Lionello Lunesu (3/16) Jan 09 2007 Uhm, sorry. That doesn't seem to prevent the initialization at all...
• Thomas Kuehne (24/39) Jan 09 2007 -----BEGIN PGP SIGNED MESSAGE-----
• Lionello Lunesu (10/12) Jan 09 2007 Well, Frank's code:
• Thomas Kuehne (40/52) Jan 10 2007 -----BEGIN PGP SIGNED MESSAGE-----
• Frank Benoit (keinfarbton) (2/2) Jan 10 2007 Thanks for the answers.
• Stewart Gordon (17/44) Jan 11 2007 ----------

"Frank Benoit (keinfarbton)" <benoit tionex.removethispart.de> writes:

TypeA[] ta = .... ; // big array with something
TypeB[] tb;
tb.length = ta.length; // (1)
foreach( uint i, TypeA a; ta ){
  tb[i] = ta[i].getB();
}

(1) how can I avoid the default initialization?

-- Frank

Lionello Lunesu <lio lunesu.remove.com> writes:

Frank Benoit (keinfarbton) wrote:
 TypeA[] ta = .... ; // big array with something
 TypeB[] tb;
 tb.length = ta.length; // (1)
 foreach( uint i, TypeA a; ta ){
   tb[i] = ta[i].getB();
 }
 
 (1) how can I avoid the default initialization?
 
 -- Frank

type[] t = void;

Lionello Lunesu <lio lunesu.remove.com> writes:

Lionello Lunesu wrote:
 Frank Benoit (keinfarbton) wrote:
 TypeA[] ta = .... ; // big array with something
 TypeB[] tb;
 tb.length = ta.length; // (1)
 foreach( uint i, TypeA a; ta ){
   tb[i] = ta[i].getB();
 }

 (1) how can I avoid the default initialization?

 -- Frank

 
 type[] t = void;

Uhm, sorry. That doesn't seem to prevent the initialization at all...

L.

Thomas Kuehne <thomas-dloop kuehne.cn> writes:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Lionello Lunesu schrieb am 2007-01-09:
 Lionello Lunesu wrote:
 Frank Benoit (keinfarbton) wrote:
 TypeA[] ta = .... ; // big array with something
 TypeB[] tb;
 tb.length = ta.length; // (1)
 foreach( uint i, TypeA a; ta ){
   tb[i] = ta[i].getB();
 }

 (1) how can I avoid the default initialization?

 -- Frank

 
 type[] t = void;

 Uhm, sorry. That doesn't seem to prevent the initialization at all...

Can you provide a code sampel?

Tested on Linux:












a: [12345678,12345678,12345678,12345678]
b: [-607311696,-609996928,0,-608522976]

Thomas


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"Lionello Lunesu" <lionello lunesu.remove.com> writes:

 Uhm, sorry. That doesn't seem to prevent the initialization at all...

 Can you provide a code sampel?

Well, Frank's code:

TypeA[] ta = .... ; // big array with something
TypeB[] tb = void;
tb.length = ta.length; // (1)
foreach( uint i, TypeA a; ta ){
  tb[i] = ta[i].getB();
}

For unsized dynamic arrays (TypeB[]), =void does not prevent the 
initialization when you change the length later.

L. 

Thomas Kuehne <thomas-dloop kuehne.cn> writes:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Lionello Lunesu schrieb am 2007-01-10:
 Uhm, sorry. That doesn't seem to prevent the initialization at all...

 Can you provide a code sampel?

 Well, Frank's code:

 TypeA[] ta = .... ; // big array with something
 TypeB[] tb = void;
 tb.length = ta.length; // (1)
 foreach( uint i, TypeA a; ta ){
   tb[i] = ta[i].getB();
 }

 For unsized dynamic arrays (TypeB[]), =void does not prevent the 
 initialization when you change the length later.

It is working as advertised in
http://www.digitalmars.com/d/declaration.html (Void Initializations)
http://www.digitalamrs.com/d/arrays.html (Setting Dynamic Array Length)

The below code might help solve your problem with new'ing dynamic
arrays. (Windows most likely requires some "import" changes.)














.. elements];














Thomas


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"Frank Benoit (keinfarbton)" <benoit tionex.removethispart.de> writes:

Thanks for the answers.
Frank

Stewart Gordon <smjg_1998 yahoo.com> writes:

Thomas Kuehne wrote:
 -----BEGIN PGP SIGNED MESSAGE-----
 Hash: SHA1
 
 Lionello Lunesu schrieb am 2007-01-09:
 Lionello Lunesu wrote:
 Frank Benoit (keinfarbton) wrote:
 TypeA[] ta = .... ; // big array with something
 TypeB[] tb;
 tb.length = ta.length; // (1)
 foreach( uint i, TypeA a; ta ){
   tb[i] = ta[i].getB();
 }

 (1) how can I avoid the default initialization?

 -- Frank

 type[] t = void;

 Uhm, sorry. That doesn't seem to prevent the initialization at all...


Actually, it's unpredictable, even dangerous.

 Can you provide a code sampel?

----------
import std.stdio;

void main() {
     int[] data = void;

     writefln("%08x %08x", data.ptr, data.length);
     data.length = 16;
     writefln("%08x %08x", data.ptr, data.length);
     writefln(data);
}
----------

You'll be lucky if the last statement doesn't throw an AV.  The danger 
arises if you try to write to the memory at the uninitialised pointer.

 Tested on Linux:








<snip>

Of course that works.  That's a static array.

Stewart.