CTFE implementation

[Don Clugston]

Frank Benoit wrote:
> Don Clugston schrieb:
>> Looks like a CTFE bug.
>> Try creating the GUID struct in place, that often works better.
>>
>> return GUID(HexToInt( str[1 .. 9] ), ...
>> [HexToInt( str[25+2*0 .. 25+2*0], ...
>> ,HexToInt( str[25+2*5 .. 25+2*5]] );
> 
> I tried this without luck:

opCall definitely won't work with CTFE yet. But struct constructors work in 
every case I've ever tried.

> struct __GUID{
> static __GUID opCall( uint Data1_, ushort Data2_, ushort Data3_, 
> ubyte[8] Data4_ ){
>     __GUID s;
>     s.Data1 = Data1_;
>     s.Data2 = Data2_;
>     s.Data3 = Data3_;
>     s.Data4[0..8] = Data4_[0..8];
>     return s;
> }
> align(1):
> uint Data1;
> ushort Data2;
> ushort Data3;
> ubyte[8] Data4;
> }
> alias __GUID GUID;
> 
> GUID IIDFromString(char[] d) {
>     return GUID(1,2,3,[0,1,2,3,4,5,6,7]);
> }
> 
> 
>