I'm trying to create a basic List type using Algebraic, but the
compiler keeps complaining about recursive aliasing.
import std.variant;
struct Cons(T, U: List)
{
public static opCall(T t, U u)
{
}
}
//Error
alias List = Algebraic!(typeof(null), Cons!(int, This));
Meta:
I'm trying to create a basic List type using Algebraic, but the
compiler keeps complaining about recursive aliasing.
As stated in its docs, Algebraic is not yet finished and good for
recursive data structures. But here I have put an usage example
of that kind:
Meta:
alias List = Algebraic!(typeof(null), Cons!(int, This));
Also your Cons seems a value type, like Algebraic itself. You
have to avoid creating an infinite-size algebraic value.
Bye,
bearophile
On Sunday, 27 April 2014 at 20:22:12 UTC, bearophile wrote:
Meta:
I'm trying to create a basic List type using Algebraic, but
the compiler keeps complaining about recursive aliasing.
As stated in its docs, Algebraic is not yet finished and good
for recursive data structures. But here I have
On Sunday, 27 April 2014 at 20:38:37 UTC, Meta wrote:
Is it necessary to use This[]? I tried changing it to This* and
it blew up on me.
I should specify. This did not work:
alias T = Algebraic!(int, This*);
void main() {
auto l = T(1, new T(2, new T(3, null)));
}
On Sunday, 27 April 2014 at 20:28:28 UTC, bearophile wrote:
Meta:
alias List = Algebraic!(typeof(null), Cons!(int, This));
Also your Cons seems a value type, like Algebraic itself. You
have to avoid creating an infinite-size algebraic value.
Bye,
bearophile
Yes, it's hard to figure out
Meta:
I should specify. This did not work:
alias T = Algebraic!(int, This*);
void main() {
auto l = T(1, new T(2, new T(3, null)));
}
An Algebraic is a sum type, so you can't store two value in it,
only one, an int or a T*. But this is not going to solve your
problems...
Bye,
On Sunday, 27 April 2014 at 20:54:02 UTC, bearophile wrote:
An Algebraic is a sum type, so you can't store two value in it,
only one, an int or a T*. But this is not going to solve your
problems...
Bye,
bearophile
Ah, you're right. I'm getting mixed up from my own initial
example. Fiddling
Meta:
The more I try to use Algebraic, the more I come to think that
this is something that can't be done cleanly in a library, even
in D.
Algebraic is currently unfinished and needs improvements. If it
turns out it's not possible to implement it well in library code,
we can find the
