Ref and class function calls?
John Colvin
john.loughran.colvin at gmail.com
Tue Apr 16 07:33:20 PDT 2013
On Tuesday, 16 April 2013 at 05:37:48 UTC, Tofu Ninja wrote:
> I could not think of what to call this because I don't know if
> it has a name to call it by.
>
> Basicly what I was wondering is if their was a way in D to make
> a class function pass the object being called on by reference.
>
> might be easier to show code, basically I want something like
> this to be possible
>
> class A
> {
> //some how signify that this function passes 'this' by
> reference
> public void replace()
> {
> this = new A();
> }
> }
>
> ...
>
> A a = new A();
> A b = a;
> b.replace();
> assert(b != a);
>
> I don't know if I am being clear or if their is something
> better to call this.
>
> Thanks for the help
> Tofu
A member function cannot modify it's own 'this' pointer.
However, a free function can do it happily, which when combined
with UFCS gives you the same syntax and behaviour:
class A {
//......
}
void replace(ref A a)
{
a = new A();
}
void main() {
A a = new A();
A b = a;
assert(b is a);
b.replace();
assert(!(b is a));
}
http://dpaste.dzfl.pl/147f69e1
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