digitalmars.D.learn - static array casting

• Hoenir (8/8) Mar 27 2008 Why does
• Jarrett Billingsley (3/11) Mar 27 2008 Works for me. Are you sure you have exactly 1024 values in that array?
• Jarrett Billingsley (9/24) Mar 27 2008 Stupid OE.
• Hoenir (4/14) Apr 01 2008 Yes, the error is "Error: non-constant expression cast(RGBA [256u])"
Hoenir <mrmocool gmx.de> writes:
Why does

RGBA[] PALETTE = cast(RGBA[]) [
0x00, 0x00, 0x00, 0x00, 0xE3, 0x53, 0x00, 0x00,...... ];

work, but

RGBA[256] PALETTE = cast(RGBA[256]) [
0x00, 0x00, 0x00, 0x00, 0xE3, 0x53, 0x00, 0x00,...];

doesn't?
RGBA simply is a struct containing r,g,b and a as ubytes.
Mar 27 2008
"Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"Hoenir" <mrmocool gmx.de> wrote in message
news:fsgsed\$18s3\$1 digitalmars.com...
Why does

RGBA[] PALETTE = cast(RGBA[]) [
0x00, 0x00, 0x00, 0x00, 0xE3, 0x53, 0x00, 0x00,...... ];

work, but

RGBA[256] PALETTE = cast(RGBA[256]) [
0x00, 0x00, 0x00, 0x00, 0xE3, 0x53, 0x00, 0x00,...];

doesn't?
RGBA simply is a struct containing r,g,b and a as ubytes.
Works for me. Are you sure you have exactly 1024 values in that array?
Mar 27 2008
"Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:
"Jarrett Billingsley" <kb3ctd2 yahoo.com> wrote in message
news:fsh6bs\$23oi\$1 digitalmars.com...
"Hoenir" <mrmocool gmx.de> wrote in message
news:fsgsed\$18s3\$1 digitalmars.com...
Why does

RGBA[] PALETTE = cast(RGBA[]) [
0x00, 0x00, 0x00, 0x00, 0xE3, 0x53, 0x00, 0x00,...... ];

work, but

RGBA[256] PALETTE = cast(RGBA[256]) [
0x00, 0x00, 0x00, 0x00, 0xE3, 0x53, 0x00, 0x00,...];

doesn't?
RGBA simply is a struct containing r,g,b and a as ubytes.
Works for me. Are you sure you have exactly 1024 values in that array?
Stupid OE. You weren't very clear on what what was happening. It works when it's in a function, but not when declared at global scope. As for why it fails with a stupid "non-const expression" error? Who knows. Probably a bug. Maybe it's already committed. As a weird workaround, you can do this: RGBA[256] Pal = (cast(RGBA[])[ ... ])[0 .. 256];
Mar 27 2008
Hoenir <mrmocool gmx.de> writes:
Jarrett Billingsley schrieb:
You weren't very clear on what what was happening.  It works when it's in a
function, but not when declared at global scope.

Yes I use it at global scope.
As for why it fails with a stupid "non-const expression" error?  Who knows.
Probably a bug.  Maybe it's already committed.

Yes, the error is "Error: non-constant expression cast(RGBA [256u])"
As a weird workaround, you can do this:

RGBA[256] Pal = (cast(RGBA[])[ ... ])[0 .. 256];

I already considered using slicing but didn't get it to work. Thank you :)
Apr 01 2008