• Lucien (18/18) Apr 14 2016 How can I override a property ?
• Satoshi (12/30) Apr 14 2016 try
• Steven Schveighoffer (8/25) Apr 14 2016 This isn't valid, you need parentheses for foo. This doesn't compile
• Lucien (19/47) Apr 14 2016 You're right.
• Steven Schveighoffer (8/25) Apr 14 2016 Hm... I don't know. the error specifically says it's not supported. But

Lucien <lucien.perregaux gmail.com> writes:

How can I override a property ?

Test code:
----------------------------
class A
{
      property bool foo { return false; }
     void myFunc() { ... }
}

class B : A
{
     override bool foo { return true; } // error
     override void myFunc() { ... }
}
----------------------------
Output error:
function B.foo return type inference is not supported if may 
override base class function.

Any ideas ?

Satoshi <satoshi gshost.eu> writes:

On Thursday, 14 April 2016 at 20:21:38 UTC, Lucien wrote:
 How can I override a property ?

 Test code:
 ----------------------------
 class A
 {
      property bool foo { return false; }
     void myFunc() { ... }
 }

 class B : A
 {
     override bool foo { return true; } // error
     override void myFunc() { ... }
 }
 ----------------------------
 Output error:
 function B.foo return type inference is not supported if may 
 override base class function.

 Any ideas ?


try

class A
{
      property bool foo() { return false; }
     void myFunc() { ... }
}

class B : A
{
     override  property bool foo() { return true; } // error
     override void myFunc() { ... }
}

Steven Schveighoffer <schveiguy yahoo.com> writes:

On 4/14/16 4:21 PM, Lucien wrote:
 How can I override a property ?

 Test code:
 ----------------------------
 class A
 {
       property bool foo { return false; }

This isn't valid, you need parentheses for foo. This doesn't compile 
does it?

      void myFunc() { ... }
 }

 class B : A
 {
      override bool foo { return true; } // error

Same thing here.

      override void myFunc() { ... }
 }
 ----------------------------
 Output error:
 function B.foo return type inference is not supported if may override
 base class function.

This has to do with type inference. Did you not specify bool in your 
original?

If I put parens on both foo, then it compiles for me.

-Steve

Lucien <lucien.perregaux gmail.com> writes:

On Thursday, 14 April 2016 at 20:39:50 UTC, Steven Schveighoffer 
wrote:
 On 4/14/16 4:21 PM, Lucien wrote:
 How can I override a property ?

 Test code:
 ----------------------------
 class A
 {
       property bool foo { return false; }

 This isn't valid, you need parentheses for foo. This doesn't 
 compile does it?

      void myFunc() { ... }
 }

 class B : A
 {
      override bool foo { return true; } // error

 Same thing here.

      override void myFunc() { ... }
 }
 ----------------------------
 Output error:
 function B.foo return type inference is not supported if may 
 override
 base class function.

 This has to do with type inference. Did you not specify bool in 
 your original?

 If I put parens on both foo, then it compiles for me.

 -Steve

You're right.
In fact it didn't work because I did:

----------------------------
class A
{
      property foo() { return false; }
     void myFunc() {  }
}

class B : A
{
     override  property foo() { return true; } // error
     override void myFunc() {  }
}
----------------------------

When I remove the bool, the program compile but show the error 
when overriding.
Is it a bug ?

Steven Schveighoffer <schveiguy yahoo.com> writes:

On 4/14/16 4:54 PM, Lucien wrote:
 You're right.
 In fact it didn't work because I did:

 ----------------------------
 class A
 {
       property foo() { return false; }
      void myFunc() {  }
 }

 class B : A
 {
      override  property foo() { return true; } // error
      override void myFunc() {  }
 }
 ----------------------------

 When I remove the bool, the program compile but show the error when
 overriding.
 Is it a bug ?

Hm... I don't know. the error specifically says it's not supported. But 
it seems to me odd that it wouldn't. What is the harm in letting the 
derived function use inferred return type?

I don't know the reasoning behind the error condition, so I can say it's 
definitely not a bug, but I don't know why it's this way. Perhaps 
there's some situation that I'm not thinking of.

-Steve