Sean Kelly wrote:
> Steven Schveighoffer Wrote:
>
>> On Thu, 05 Aug 2010 13:53:20 -0400, dcoder <dco...@devnull.com> wrote:
>>
>> > Suppose I have a base class with many ctors().
>> >
>> > I want to inherit from the base class and make one slight alteration to
>> > it,
>> > but I don't want to write X times the following:
>> >
>> > this(args) {
>> > super(args);
>> > }
>> >
>> > Does D have an easy way for the derived class to 'inherit' all or some
>> > of the
>> > base class ctors(), and just override/add ctors() in the derived class?
>>
>> Sadly, no. It's been discussed in the past. I was surprised there were
>> no enhancement requests for it in bugzilla, care to add one?
>
> If it helps, I wrote up something on this a few years back:
>
>
http://www.digitalmars.com/d/archives/digitalmars/D/Inheriting_constructors_54088.html
>
> Might be a good starting point for an enhancement request.
I've been trying to make a template for this but it seems that dmd still
won't allow me to get the parameters of the constructors. dmd Seems to think
that I'm trying to use it as a property.
Using getOverloads, one should be able to generate or select any of super's
constructors. No need for enhancement, just a bug fix. see below:
import std.traits;
import std.conv;
class A {
int i;
this(int x) {
i = x;
}
this(float x) {
i = cast(int)x; // ignore bad code
}
this(string s) {
i = to!int(s);
}
}
void main() {
foreach (m; __traits(getOverloads, A, "__ctor")) {
pragma(msg, m.stringof); // it thinks I'm calling m
}
}
constructors.d(34): Error: constructor constructors.A.this (int x) is not
callable using argument types ()
constructors.d(34): Error: expected 1 function arguments, not 0
this()
constructors.d(34): Error: constructor constructors.A.this (float x) is not
callable using argument types ()
constructors.d(34): Error: expected 1 function arguments, not 0
this()
constructors.d(34): Error: constructor constructors.A.this (string s) is not
callable using argument types ()
constructors.d(34): Error: expected 1 function arguments, not 0
this()
