• Agustin (19/19) Nov 26 2013 I'm trying to move from Java to D, and i have some like this:
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (21/40) Nov 26 2013 You have to provide the implementations of the interface functions
• Agustin (9/56) Nov 26 2013 Oh i forgot to add the implementation here, but its there, what i
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (14/20) Nov 26 2013 I don't know any other way than implementing in terms of B:
• Jesse Phillips (3/7) Nov 26 2013 Changing protection level like that seems very confusing.I'd

"Agustin" <agustin.l.alvarez hotmail.com> writes:

I'm trying to move from Java to D, and i have some like this:

interface A
{
   public bool isCancelled();
   public void setCancelled(bool value);
}

class B
{
   public bool isCancelled();
   protected void setCancelled(bool value);
}

But when i do

class C : B, A
{}

I get

Engine/Main.d(6): Error: class Main.C interface function 'bool 
isCancelled()' is not implemented
Engine/Main.d(6): Error: class Main.C interface function 'void 
setCancelled(bool value)' is not implemented

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 11/26/2013 09:32 AM, Agustin wrote:
 I'm trying to move from Java to D, and i have some like this:

 interface A
 {
    public bool isCancelled();
    public void setCancelled(bool value);
 }

 class B
 {
    public bool isCancelled();
    protected void setCancelled(bool value);
 }

 But when i do

 class C : B, A
 {}

 I get

 Engine/Main.d(6): Error: class Main.C interface function 'bool
 isCancelled()' is not implemented
 Engine/Main.d(6): Error: class Main.C interface function 'void
 setCancelled(bool value)' is not implemented

You have to provide the implementations of the interface functions 
either in B or C. I think you actually tested with B implementations though:

class B
{
     public bool isCancelled()
     {
         // implemented
         return false;
     }

     protected void setCancelled(bool value)
     {
         // implemented
     }
}

Still the same error...

Unless you want to implement the functions on C as well, then C should 
not inherit from A. A is already inherited by B:

class C : B    // <-- no A
{}

Ali

"Agustin" <agustin.l.alvarez hotmail.com> writes:

On Tuesday, 26 November 2013 at 17:50:12 UTC, Ali Çehreli wrote:
 On 11/26/2013 09:32 AM, Agustin wrote:
 I'm trying to move from Java to D, and i have some like this:

 interface A
 {
   public bool isCancelled();
   public void setCancelled(bool value);
 }

 class B
 {
   public bool isCancelled();
   protected void setCancelled(bool value);
 }

 But when i do

 class C : B, A
 {}

 I get

 Engine/Main.d(6): Error: class Main.C interface function 'bool
 isCancelled()' is not implemented
 Engine/Main.d(6): Error: class Main.C interface function 'void
 setCancelled(bool value)' is not implemented

 You have to provide the implementations of the interface 
 functions either in B or C. I think you actually tested with B 
 implementations though:

 class B
 {
     public bool isCancelled()
     {
         // implemented
         return false;
     }

     protected void setCancelled(bool value)
     {
         // implemented
     }
 }

 Still the same error...

 Unless you want to implement the functions on C as well, then C 
 should not inherit from A. A is already inherited by B:

 class C : B    // <-- no A
 {}

 Ali

Oh i forgot to add the implementation here, but its there, what i 
want to do is with an interface be able to change "protected" to 
"public", this is possible using Java but i don't know if 
possible using D.


class C : B, A -> setCancelled() is changed from protected to 
public
{
}

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 11/26/2013 09:52 AM, Agustin wrote:

 Oh i forgot to add the implementation here, but its there, what i want
 to do is with an interface be able to change "protected" to "public",
 this is possible using Java but i don't know if possible using D.


 class C : B, A -> setCancelled() is changed from protected to public
 {
 }

I don't know any other way than implementing in terms of B:

class C : B, A
{
     public override bool isCancelled()
     {
         return B.isCancelled();
     }

     protected override void setCancelled(bool value)
     {
         B.setCancelled(value);
     }
}

Ali

"Jesse Phillips" <Jesse.K.Phillips+D gmail.com> writes:

On Tuesday, 26 November 2013 at 17:52:28 UTC, Agustin wrote:
 Oh i forgot to add the implementation here, but its there, what 
 i want to do is with an interface be able to change "protected" 
 to "public", this is possible using Java but i don't know if 
 possible using D.

Changing protection level like that seems very confusing.I'd 
expect a child to be able to expand visibility, not reduce it.