On Wed, 04 Nov 2009 13:35:45 -0500, Travis Boucher
<[email protected]> wrote:
I am writing a generic vector base class. The class implements all of
the operator overloads so I don't have to implement them over and over
and over for each type of vector class.
class VectorBase(size_t S, T) {
T[S] data;
...
}
class Vector3f : VectorBase!(3, float) { ... }
The problem I am having is implementing operations that can take a
matching vector. I can't figure out the proper way of declaring the
type of input.
eg.
void opAssign(VectorBase!(S, T) r);
> function VectorBase!(3LU,float).VectorBase.opAssign identity
assignment operator overload is illegal
void opAssign(this r);
> basic type expected, not this
The only way I can think of handling it is to add another parameter to
the template declaration, eg:
class VectorBase(size_t S, T, N) { ... }
class Vector3f : VectorBase!(3, float, Vector3f) { ... }
But I would like to avoid that if possible.
Any hints on how to implement this so I can keep my original
declaration? class VectorBase(size_t S, T)
Well first, you can't overload assignment of a class to it's own type.
(It's part of the language spec, at the bottom of the operator overload
page IIRC) Second, I've already solved this in D2, (using structs) so let
me know if you want code. Third, fixed sized arrays as value-type are
coming in the next release (I think), so you could wait for that. Lastly,
you're (probably) going to run into issues with your other operator
overloads because of some bugs in instantiating templates inside of
templates using template literals as opposed to types.
