Hello,


I'm on DMD 1.036.
When I'm compiling this code :

// -------------CODE-----------------------


enum ColorValues:uint
{
     AliceBlue  = 0xF0F8FFFF
    ,AntiqueWhite  = 0xF8ECD8FF
    ,Aqua  = 0x00FFFFFF
    ,Aquamarine  = 0x80FFD0FF
    ,Azure  = 0xF0FFFFFF
    ,Beige  = 0xF8F4E0FF
    ,Bisque  = 0xFFE4C8FF

     [...]


Color convertToColor(uint val)
{
    ubyte[4] colorVal = *cast(ubyte*)&val;

    return Color(    colorVal[0]
                    ,colorVal[1]
                    ,colorVal[2]
                    ,colorVal[3]
                 );
}

class DFLCalendar:Panel
{
    // Graphicals objects
    protected
    {
        // Colors default preferences :
        const Color colorPanMonth  = convertToColor(cast(uint)ColorValues.MidnightBlue);
        const Color colorPanDays   = convertToColor(cast(uint)ColorValues.White);
        const uint  heightPanMonth = 16 ;
        const uint  widthButChangeMonth = 10;
	
	[...]
// -------------END CODE-------------------

The compiler return me the error :

	tools\gui\tools\DFLCalendar.d(29): Error: cannot evaluate convertToColor(404254975u) at compile time

Line 29 corresponds to "const Color colorPanMonth  = convertToColor(cast(uint)ColorValues.MidnightBlue);"


Thanks in advance for your help,
TSalm

21.11.08 в 01:57 tsalm в своём письме писал(а):

> Hello,
>
>
> I'm on DMD 1.036.
> When I'm compiling this code :
>
> // -------------CODE-----------------------
>
>
> enum ColorValues:uint
> {
>       AliceBlue  = 0xF0F8FFFF
>      ,AntiqueWhite  = 0xF8ECD8FF
>      ,Aqua  = 0x00FFFFFF
>      ,Aquamarine  = 0x80FFD0FF
>      ,Azure  = 0xF0FFFFFF
>      ,Beige  = 0xF8F4E0FF
>      ,Bisque  = 0xFFE4C8FF
>
>       [...]
>
>
> Color convertToColor(uint val)
> {
>      ubyte[4] colorVal = *cast(ubyte*)&val;
>
>      return Color(    colorVal[0]
>                      ,colorVal[1]
>                      ,colorVal[2]
>                      ,colorVal[3]
>                   );
> }
>
> class DFLCalendar:Panel
> {
>      // Graphicals objects
>      protected
>      {
>          // Colors default preferences :
>          const Color colorPanMonth  = convertToColor(cast(uint)ColorValues.MidnightBlue);
>          const Color colorPanDays   = convertToColor(cast(uint)ColorValues.White);
>          const uint  heightPanMonth = 16 ;
>          const uint  widthButChangeMonth = 10;
> 	
> 	[...]
> // -------------END CODE-------------------
>
> The compiler return me the error :
>
> 	tools\gui\tools\DFLCalendar.d(29): Error: cannot evaluate convertToColor(404254975u) at compile time
>
> Line 29 corresponds to "const Color colorPanMonth  = convertToColor(cast(uint)ColorValues.MidnightBlue);"
>
>
> Thanks in advance for your help,
> TSalm

I wouldn't recommend you to use that trick, you may have problems with Endianess. But in case you don't care I would suggest you to use the following "cast" instead:

union ColorProxy {
   uint color;
   struct {
       ubyte red;
       ubyte green;
       ubyte blue;
       ubyte alpha;
   }
}

ColorProxy proxy;
proxy.color = ColorValues.Aqua;
return Color(proxy.red, proxy.green, proxy.blue, proxy.alpha);

Le Fri, 21 Nov 2008 00:34:03 +0100, Denis Koroskin <2korden@gmail.com> a écrit:

> union ColorProxy {
>    uint color;
>    struct {
>        ubyte red;
>        ubyte green;
>        ubyte blue;
>        ubyte alpha;
>    }
> }
>  ColorProxy proxy;
> proxy.color = ColorValues.Aqua;
> return Color(proxy.red, proxy.green, proxy.blue, proxy.alpha);

Yes it's a better way.
Thanks.