• Ivan Senji (10/10) Apr 14 2004 why can't interfaces contain static functions?
• Russ Lewis (12/25) Apr 14 2004 My thought is that an interface defines an interface into a class.
• Ivan Senji (9/20) Apr 14 2004 OOps I am sorry this is what i wanted to write,
• Ivan Senji (4/15) Apr 15 2004 HM! I tried something like this in C# but it doesnt work there either.

"Ivan Senji" <ivan.senji public.srce.hr> writes:

why can't interfaces contain static functions?

for example:

interface IElement
{
    static IElement create(){...}
}

I would expect that the class implementing this interface must
define "static IElement create()"
but if it doesn't the compiler doesn't complain
and if it does implement this function I get a linker error?

Russ Lewis <spamhole-2001-07-16 deming-os.org> writes:

My thought is that an interface defines an interface into a class. 
Interfaces don't actually implement anything.  So you would do something 
like this:

interface IElement
{
	static IElement create();
}

class Foo : IElement
{
	static IElement create() {...};
}



Ivan Senji wrote:
 why can't interfaces contain static functions?
 
 for example:
 
 interface IElement
 {
     static IElement create(){...}
 }
 
 I would expect that the class implementing this interface must
 define "static IElement create()"
 but if it doesn't the compiler doesn't complain
 and if it does implement this function I get a linker error?

"Ivan Senji" <ivan.senji public.srce.hr> writes:

"Russ Lewis" <spamhole-2001-07-16 deming-os.org> wrote in message
news:c5l2m7$t9j$1 digitaldaemon.com...
 My thought is that an interface defines an interface into a class.
 Interfaces don't actually implement anything.  So you would do something
 like this:

 interface IElement
 {
 static IElement create();
 }

 class Foo : IElement
 {
 static IElement create() {...};
 }

OOps I am sorry this is what i wanted to write,
the {}in the interface are a typing error.
The actual code looks just like the one you wrote
but it doesnt work.

If class Foo does implement IElement but it doesn't
implement "static IElement create()" this isn't an error
but even if it does implement it i get a linker error.

"Ivan Senji" <ivan.senji public.srce.hr> writes:

"Russ Lewis" <spamhole-2001-07-16 deming-os.org> wrote in message
news:c5l2m7$t9j$1 digitaldaemon.com...
 My thought is that an interface defines an interface into a class.
 Interfaces don't actually implement anything.  So you would do something
 like this:

 interface IElement
 {
 static IElement create();
 }

 class Foo : IElement
 {
 static IElement create() {...};
 }


But it would be very useful in D :)