Is there a way to return an lvalue and also an rvalue from the same member function?

realhet real_het at
Sun Sep 20 16:06:44 UTC 2020

On Sunday, 20 September 2020 at 15:52:49 UTC, realhet wrote:
> On Sunday, 20 September 2020 at 14:54:09 UTC, Steven 
> Schveighoffer wrote:
>> On 9/20/20 9:30 AM, realhet wrote:

I managed to do the constant swizzles and it seems so elegant:

   auto opDispatch(string def)() const
   if(validRvalueSwizzle(def)) //making sure that only the few 
thousand valid swizzles can pass through here
     static if(def.startsWith('_')){ //if the swizzle definition 
starts with a number
       return opDispatch!(def[1..$]);
       Vec!(CT, mixin(def.length)) res;
       static foreach(i, ch; def)
         res[i] = mixin(ch);  // ch can be one of xyzw or rgba or 
stpq or 0 or 1.
                              // just mix it in using the already 
created lvalue swizzles of (integer consts 01)
       return res;

I also have an idea that if I use capital letters, it shoud mean 
negative components. This way importing a 3d vertex could be so 
easy in compile time: rotated = original.xZy -> this is rotated 
90 degrees around the x axis. Just need to add an uppercase check.

Never dared to go that far in compile time dlang stuff, and I 
love it. :D Amazing language!

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