So I'm trying to port the Cg internal types (float2,float3,float4)to D right
now.
I'm almost done, but I ran into three problems on the way.

First of all, it's impossible to do componentwise operator overloading for the
less and equality operators.
in  cg

float4(0,2,4,6) < float4(1,3,3,3)
returns
float4(1,1,0,0)

given the way opCmp is structured I can only accomplish this in C++ by
overloading the individual operators.
the same problem is given with the equality comparison being componentwise.

the last problem is of course the overloadable ?: operator--but I guess users
will just have to call a member function... I guess the same rule applies to
letting users use < and > and == operators
it would be nice if we were allowed to specify our return types for *all*
operators rather than just *most* of them :-)

the rest of the syntax looks JUST like cg. you can do
float4(1,2,3).zyx = float2(1,2,3).xxx*4*float3(2,3,4);
and other such odd Cg syntax
--Daniel

check out http://cvs.sourceforge.net/viewcvs.py/deliria/deliria/vec.d for how it works :-)

hellcatv@hotmail.com wrote:

> So I'm trying to port the Cg internal types (float2,float3,float4)to D right
> now.
> I'm almost done, but I ran into three problems on the way.

What's Cg?

> First of all, it's impossible to do componentwise operator overloading for the
> less and equality operators.

You could always define your own function to do this.

<snip>
> it would be nice if we were allowed to specify our return types for *all*
> operators rather than just *most* of them :-)
<snip>

So, how would one sort or binary search using a comparator that returns something other than a number?

Stewart.

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Stewart Gordon wrote:

> hellcatv@hotmail.com wrote:
>
>> So I'm trying to port the Cg internal types (float2,float3,float4)to D right
>> now.
>> I'm almost done, but I ran into three problems on the way.
>
>
> What's Cg?

Yeah are you talking about computer graphics or C graphics (which is Nvidia's, C like shading language).

-- 
-Anderson: http://badmama.com.au/~anderson/