• Lester (15/15) Jun 16 2017 If I have something like the following:
• Milan Suk (16/31) Jun 16 2017 What about something like this?
• Adam D. Ruppe (13/16) Jun 16 2017 try one of these:
• Lester (3/3) Jun 16 2017 Thanks for the responses guys :)

Lester <lester whatever.org> writes:

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".

Milan Suk <Milansuk email.cz> writes:

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"
  }

Adam D. Ruppe <destructionator gmail.com> writes:

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.

Lester <lester whatever.org> writes:

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

Thanks again for your help.