• =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= (21/21) Feb 02 2021 Reason:
• Max Haughton (4/25) Feb 03 2021 Do you mean "Can I set onSuccess" at runtime? The virtual tables
• evilrat (3/10) Feb 03 2021 Not to mention that compiler can optimize away virtual calls if
• =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= (2/14) Feb 03 2021 evilrat, frame, thanks.
• =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= (2/5) Feb 03 2021 Yes.
• frame (23/44) Feb 03 2021 It is possible to change to context of a delegate:

=?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:

Reason:
     Reuse component,
     bind custom callback without creating new class.

Concept example:
     class SaveFilePopup
     {
         void onSuccess() { /* default operations */ }
     }

     auto saveFile = new SaveFilePopup();
     saveFile.onSuccess = { /* New operations */ }

Delegate:
     may be... but, for speed reason, is possible to set the 
default code at compile-time ?

     class X
     {
        void delegate() onSuccess = { /* default code */ };
     }

Context:
     GUI, components, callbacks

Possible to change the vtbl record at runtime ?
Has functional for update vtbl records ?

Max Haughton <maxhaton gmail.com> writes:

On Wednesday, 3 February 2021 at 05:30:37 UTC, Виталий Фадеев 
wrote:
 Reason:
     Reuse component,
     bind custom callback without creating new class.

 Concept example:
     class SaveFilePopup
     {
         void onSuccess() { /* default operations */ }
     }

     auto saveFile = new SaveFilePopup();
     saveFile.onSuccess = { /* New operations */ }

 Delegate:
     may be... but, for speed reason, is possible to set the 
 default code at compile-time ?

     class X
     {
        void delegate() onSuccess = { /* default code */ };
     }

 Context:
     GUI, components, callbacks

 Possible to change the vtbl record at runtime ?
 Has functional for update vtbl records ?

Do you mean "Can I set onSuccess" at runtime? The virtual tables 
are relied upon by the compiler so I wouldn't play with them.

evilrat <evilrat666 gmail.com> writes:

On Wednesday, 3 February 2021 at 08:26:05 UTC, Max Haughton wrote:
 On Wednesday, 3 February 2021 at 05:30:37 UTC, Виталий Фадеев 
 wrote:
 Possible to change the vtbl record at runtime ?
 Has functional for update vtbl records ?

 Do you mean "Can I set onSuccess" at runtime? The virtual 
 tables are relied upon by the compiler so I wouldn't play with 
 them.

Not to mention that compiler can optimize away virtual calls if 
it can determine final type on call site.

=?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:

On Wednesday, 3 February 2021 at 10:20:44 UTC, evilrat wrote:
 On Wednesday, 3 February 2021 at 08:26:05 UTC, Max Haughton 
 wrote:
 On Wednesday, 3 February 2021 at 05:30:37 UTC, Виталий Фадеев 
 wrote:
 Possible to change the vtbl record at runtime ?
 Has functional for update vtbl records ?

 Do you mean "Can I set onSuccess" at runtime? The virtual 
 tables are relied upon by the compiler so I wouldn't play with 
 them.

 Not to mention that compiler can optimize away virtual calls if 
 it can determine final type on call site.

evilrat, frame, thanks.

=?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:

On Wednesday, 3 February 2021 at 08:26:05 UTC, Max Haughton wrote:
 On Wednesday, 3 February 2021 at 05:30:37 UTC, Виталий Фадеев 
 wrote:
 Do you mean "Can I set onSuccess" at runtime?

Yes.

frame <frame86 live.com> writes:

On Wednesday, 3 February 2021 at 05:30:37 UTC, Виталий Фадеев 
wrote:
 Reason:
     Reuse component,
     bind custom callback without creating new class.

 Concept example:
     class SaveFilePopup
     {
         void onSuccess() { /* default operations */ }
     }

     auto saveFile = new SaveFilePopup();
     saveFile.onSuccess = { /* New operations */ }

 Delegate:
     may be... but, for speed reason, is possible to set the 
 default code at compile-time ?

     class X
     {
        void delegate() onSuccess = { /* default code */ };
     }

 Context:
     GUI, components, callbacks

 Possible to change the vtbl record at runtime ?
 Has functional for update vtbl records ?

It is possible to change to context of a delegate:

class A {
     int x = 10;
     void foo() {
         writeln(x);
     }
}

class B {
     int x = 20;
}

void main() {
     auto a = new A;
     auto b = new B;

     auto fn = &a.foo;
     fn();

     fn.ptr = &b.__vptr;
     fn();
}

But this is maybe not the best practice. If you just do not want 
to repeat yourself for identical code each class, use a mixin 
template for it.