• Anibal (17/17) Oct 09 2014 Hi everyone,
• bearophile (9/14) Oct 09 2014 You want ubytes (unsigned bytes) because 0x04 is 164 that is
• bearophile (4/6) Oct 09 2014 I'd like bytes to be named sbyte and ubyte in D, but Walter has
• Anibal (2/8) Oct 09 2014 Got it to work, thanks a lot!
• ketmar via Digitalmars-d-learn (9/9) Oct 09 2014 On Thu, 09 Oct 2014 15:26:52 +0000
• bearophile (9/15) Oct 09 2014 The problem is that cast. No one wants a string, most people want
• ketmar via Digitalmars-d-learn (5/7) Oct 10 2014 On Thu, 09 Oct 2014 20:08:11 +0000

"Anibal" <anibal.palma toc.cl> writes:

Hi everyone,

I'm just starting with D and i need a way to declare a byte array
something like:

byte[] arr = [ 0x00, 0xA4, 0x04];

This throws a int[] to byte[] cast error

Tried also these ones

byte[] arr = "\x00\xA4\x04";
byte[] arr = [ '\x00', '\xA4', '\x04'];
byte[] arr = [ u'\x00', u'\xA4', u'\x04'];
byte[] arr = [ b'\x00', b'\xA4', b'\x04'];

I also tried
byte[] arr = [cast(byte) 0x00, cast(byte)0xA4, cast(byte) 0x04];
and this at least compiles

I read the online book and nowhere there is a byte literal 
mentioned.

Is there another way besides casting to byte?

Thanks in Advance.

"bearophile" <bearophileHUGS lycos.com> writes:

Anibal:

 byte[] arr = [ 0x00, 0xA4, 0x04];

 This throws a int[] to byte[] cast error

You want ubytes (unsigned bytes) because 0x04 is 164 that is 
bigger than byte.max.

So use:

ubyte[] arr = [ 0x00, 0xA4, 0x04];


 I also tried
 byte[] arr = [cast(byte) 0x00, cast(byte)0xA4, cast(byte) 0x04];
 and this at least compiles

Generally in D try to mimize as much as possible the usage of 
cast().

Bye,
bearophile

"bearophile" <bearophileHUGS lycos.com> writes:

 You want ubytes (unsigned bytes) because 0x04 is 164 that is 
 bigger than byte.max.

I'd like bytes to be named sbyte and ubyte in D, but Walter has 
refused this.

Bye,
bearophile

"Anibal" <anibal.palma toc.cl> writes:

On Thursday, 9 October 2014 at 15:41:48 UTC, bearophile wrote:
 You want ubytes (unsigned bytes) because 0x04 is 164 that is 
 bigger than byte.max.

 I'd like bytes to be named sbyte and ubyte in D, but Walter has 
 refused this.

 Bye,
 bearophile


Got it to work, thanks a lot!

ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

On Thu, 09 Oct 2014 15:26:52 +0000
Anibal via Digitalmars-d-learn <digitalmars-d-learn puremagic.com>
wrote:

additionally to all bearophile said, there is another interesting thing
in D: special string literals for hex data.

  immutable ubyte[] n =3D cast(typeof(n))x"deadf00d";

or even:

  immutable ubyte[] n =3D cast(typeof(n))x"de ad f 0 0 d";

spaces doesn't matter, only digits do.

"bearophile" <bearophileHUGS lycos.com> writes:

ketmar:

 additionally to all bearophile said, there is another 
 interesting thing in D: special string literals for hex data.

   immutable ubyte[] n = cast(typeof(n))x"deadf00d";

 or even:

   immutable ubyte[] n = cast(typeof(n))x"de ad f 0 0 d";

 spaces doesn't matter, only digits do.

The problem is that cast. No one wants a string, most people want 
a ubyte[].

See:
https://issues.dlang.org/show_bug.cgi?id=3850
https://issues.dlang.org/show_bug.cgi?id=5909
https://issues.dlang.org/show_bug.cgi?id=10454

Bye,
bearophile

ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> writes:

On Thu, 09 Oct 2014 20:08:11 +0000
bearophile via Digitalmars-d-learn <digitalmars-d-learn puremagic.com>
wrote:

 The problem is that cast. No one wants a string, most people want=20
 a ubyte[].

This doesn't make the cut. it's handy, people wants it, it will break
almost nothing... no way.