If I have something like the following:

class A {
    void foo(){ writeln(typeof(this)); }
    ...
}

class B : A {
    ...
}

And I want the results:

A a = new A;
B b = new B;
a.foo(); // prints "A"
b.foo(); // prints "B"

How would I go about doing that? At the moment b.foo() is printing "A".

On Friday, 16 June 2017 at 13:46:14 UTC, Lester wrote:
> If I have something like the following:
>
> class A {
>     void foo(){ writeln(typeof(this)); }
>     ...
> }
>
> class B : A {
>     ...
> }
>
> And I want the results:
>
> A a = new A;
> B b = new B;
> a.foo(); // prints "A"
> b.foo(); // prints "B"
>
> How would I go about doing that? At the moment b.foo() is printing "A".

What about something like this?

 class A {}
 class B : A {}

 void foo(T)(T object) {
     import std.stdio : writeln;

     writeln(object.classinfo.toString); // you can use whatever property you want...
 }

 void main()
 {
     A a = new A;
     B b = new B;
     a.foo(); // prints "test.A"
     b.foo(); // prints "test.B"
 }

On Friday, 16 June 2017 at 13:46:14 UTC, Lester wrote:
> If I have something like the following:
>
> class A {
>     void foo(){ writeln(typeof(this)); }

try one of these:

http://dlang.org/spec/template.html#TemplateThisParameter


Though note that the this in there is still the static type at the usage point. So:

B b = new B;
b.foo; // B, because it is called through a B

but

A b = new B;
b.foo; // A, because it is called through the A interface


You can also do runtime stuff with typeid/classinfo (they return the same thing) or simply override the function in the child class (often preferred). Depends on exactly what you need it for.

Thanks for the responses guys :)
I ended up using a foo(this T) and it works!

Thanks again for your help.