What does final class Something mean?
I would expect it to mean the same as if every method were final.
Is it true?

Ivan Senji wrote:

> What does final class Something mean?
> I would expect it to mean the same as if every method were final.

I think this means that the class cannot be derived from, though I couldn't find any documentation on "final" in the spec, besides that it's an attribute.

Sean

"Sean Kelly" <sean@f4.ca> wrote in message news:c7tpsa$285g$1@digitaldaemon.com...
> Ivan Senji wrote:
>
> > What does final class Something mean?
> > I would expect it to mean the same as if every method were final.
>
> I think this means that the class cannot be derived from, though I couldn't find any documentation on "final" in the spec, besides that it's an attribute.

In an other discussion Walter mentioned that when member function is final it means it can't be overridden. That is the reason why i'm asking: nothing usefull found in the spec :)

> Sean

Sean Kelly wrote:

> Ivan Senji wrote:
> 
>> What does final class Something mean?
>> I would expect it to mean the same as if every method were final.
> 
> 
> I think this means that the class cannot be derived from, though I couldn't find any documentation on "final" in the spec, besides that it's an attribute.
> 
> Sean

I think you couldn't find any documentation because there isn't any:

http://www.digitalmars.com/drn-bin/wwwnews?D/8646
-----------------------------------------------------
Title: Re: abstract and final
Author: "Walter"
Date: Fri, 27 Sep 2002 13:22:03 -0700

I need to work on that...

"Patrick Down" <pat@codemoon.com> wrote in message
news:Xns9292E6E308983patcodemooncom@63.105.9.61...
> The page in the D docs
>
> http://www.digitalmars.com/d/attribute.html
>
> lists abstract and final but does not document them.
>
> I assume they are to have similar meaning to Java's
> abstract and final.
-----------------------------------------------------


I wrote an example to try to figure out how it works with a class. Apparently, putting "final" on a class either makes all members final or prohibits inheriting from that objects.


final.d
-----------------------------------------------------
/*

This example won't compile in with the "final" compiled in:

final.d(34): function toString cannot override final function toString

*/

/+final+/ class A
{
    private char[] name;

    /+final+/ char[] toString()
    {
        return name;
    }

    this(char[] s)
    {
        name = s;
        printf("'%.*s' created\n", name);
    }
    ~this()
    {
        printf("'%.*s' destroyed\n", name);
    }
}


class B: A /+ If class A is final this wouldn't work. +/
{
    char[] name;

    char[] toString()
    {
        return name;
    }

    this(char[] s)
    {
        super(s);
    }
    ~this()
    {
        printf("'%.*s' destroyed\n", name);
    }
}



void main()
{
}



-- 
Justin (a/k/a jcc7)
http://jcc_7.tripod.com/d/

J C Calvarese wrote:

> Sean Kelly wrote:
>
>> Ivan Senji wrote:
>>
>>> What does final class Something mean?
>>> I would expect it to mean the same as if every method were final.
>>
>>
>>
>> I think this means that the class cannot be derived from, though I couldn't find any documentation on "final" in the spec, besides that it's an attribute.
>>
>> Sean
>
>
> I think you couldn't find any documentation because there isn't any:
>
You could always look at the documentation for java's final.

http://www.glenmccl.com/perfj_025.htm

-- 
-Anderson: http://badmama.com.au/~anderson/