• TodNaz (4/20) Mar 29 2020 The question in this code is: is it possible to track the class
• Stefan Koch (3/26) Mar 29 2020 It is not generally known who has inherited a class from the
• Simen =?UTF-8?B?S2rDpnLDpXM=?= (20/43) Mar 29 2020 The question is a bit unclear - what is whoheir expected to
• WebFreak001 (14/58) Mar 30 2020 to extend on this: typeid(...) returns a TypeInfo so you can

TodNaz <hello.humanaz gmail.com> writes:

Hello!
class A
{
    ...
}

class B : A
{
    ...
}

class C : A
{
    ...
}

A example1;
B example2 = new B(...);
A = example2;
auto heir = A.whoheir(); ///

The question in this code is: is it possible to track the class 
inheritor? Or is it beyond D?
Sorry if the question is fool ...

Stefan Koch <uplink.coder gmail.com> writes:

On Sunday, 29 March 2020 at 14:04:53 UTC, TodNaz wrote:
 Hello!
class A
{
    ...
}

class B : A
{
    ...
}

class C : A
{
    ...
}

A example1;
B example2 = new B(...);
A = example2;
auto heir = A.whoheir(); ///

 The question in this code is: is it possible to track the class 
 inheritor? Or is it beyond D?
 Sorry if the question is fool ...

It is not generally known who has inherited a class from the 
parents perspective.

Simen =?UTF-8?B?S2rDpnLDpXM=?= <simen.kjaras gmail.com> writes:

On Sunday, 29 March 2020 at 14:04:53 UTC, TodNaz wrote:
 Hello!
class A
{
    ...
}

class B : A
{
    ...
}

class C : A
{
    ...
}

A example1;
B example2 = new B(...);
A = example2;
auto heir = A.whoheir(); ///

 The question in this code is: is it possible to track the class 
 inheritor? Or is it beyond D?
 Sorry if the question is fool ...

The question is a bit unclear - what is whoheir expected to 
return? This is one way that may or may not fulfill your 
requirements:

module foo;
class A {
     string whoheir() {
         return typeid(this).name;
     }
}
class B : A {}
class C : A {}

unittest {
     A a = new B();
     assert(a.whoheir == "foo.B");
     a = new C();
     assert(a.whoheir == "foo.C");
}

--
   Simen

WebFreak001 <d.forum webfreak.org> writes:

On Sunday, 29 March 2020 at 15:07:37 UTC, Simen Kjærås wrote:
 On Sunday, 29 March 2020 at 14:04:53 UTC, TodNaz wrote:
 Hello!
class A
{
    ...
}

class B : A
{
    ...
}

class C : A
{
    ...
}

A example1;
B example2 = new B(...);
A = example2;
auto heir = A.whoheir(); ///

 The question in this code is: is it possible to track the 
 class inheritor? Or is it beyond D?
 Sorry if the question is fool ...

 The question is a bit unclear - what is whoheir expected to 
 return? This is one way that may or may not fulfill your 
 requirements:

 module foo;
 class A {
     string whoheir() {
         return typeid(this).name;
     }
 }
 class B : A {}
 class C : A {}

 unittest {
     A a = new B();
     assert(a.whoheir == "foo.B");
     a = new C();
     assert(a.whoheir == "foo.C");
 }

 --
   Simen

to extend on this: typeid(...) returns a TypeInfo so you can 
perform a bit of runtime reflection, see 
https://dlang.org/phobos/object.html#.TypeInfo

To check for exact matches if your class is B or C, you can also 
use
typeid(variable) == typeid(B)
if you don't want to compare arbitrary strings. (better code 
style)

There are also libraries to help you do this sort of runtime 
reflection like witchcraft: 
https://code.dlang.org/packages/witchcraft

or a more current hunt fork, though I don't know yet what it 
changes: https://github.com/huntlabs/hunt-reflection