predef::`==() is (by definition) the same as the plain == operator. What did you expect it to be?

Then you should use ::`==().

how do i access that in a class with a parent that implements `==()? wouldn't ::`==() then get the parents definition instead of the one talked about here?

it seems odd to use an unspecified :: to access this (uhm, what is it anyways, global? top level?) function.

greetings, martin.

well, that is the question, how do i do == on this_object if the parent has a `==()?

greetings, martin.

i guess, i need to create an example, but first i am trying to recreate the original problem with predef failing, so hold that question for a moment and help me to recreate the original problem that martin had observed:

$ cat main.pike void main() { object a=((program)"equal.pike")(); object b=a; if(a==b) write("equal"); }

$ cat equal.pike int(0..1) `==(mixed rel) { if (predef::`==(rel, this)) return 1; // This is never reached. }

this creates the loop, as previously noted.

now, the suggested solution was to do remove the "predef": $ cat equal.pike int(0..1) `==(mixed rel) { if (::`==(rel, this)) return 1; // This is never reached. }

$ pike main.pike equal.pike:3:Undefined identifier "::`==". Compilation failed. /usr/local/pike/7.6.7/lib/master.pike:346: master()->compile_string("int(0..1) `==(mixed rel)\n{ \n if (::`==(rel, t his))\n return 1; // This is never reached.\n}\n","/local/home/mbaehr/s rc/pike/inherit/equal/equal.pike",0,equal.pike,0) /usr/local/pike/7.6.7/lib/master.pike:813: master()->low_findprog("/local/home/mbaehr/src/pike/inherit/equal/equal"," .pike",0,0) /usr/local/pike/7.6.7/lib/master.pike:907: master()->findprog("/local/home/mbaehr/src/pike/inherit/equal/equal",".pik e",0,0) /usr/local/pike/7.6.7/lib/master.pike:955: master()->low_cast_to_program("equal","/local/home/mbaehr/src/pike/inherit /equal/main.pike",0,0) /usr/local/pike/7.6.7/lib/master.pike:977: master()->cast_to_program("equal.pike","/local/home/mbaehr/src/pike/inheri t/equal/main.pike",0) main.pike:3: /local/home/mbaehr/src/pike/inherit/equal/main()->main()

what am i missing here?

ok that does make sense, but then i don't understand why in nilssons example ::`==() should have been used.

at least i did not get from the context that Binary.pike would necessarily have a parent that defines `==()

greetings, martin.

If the parent has `== you will probably want to call it.

Normally you just compare all the variables,

int `==(object x) { return x->a==a && x->b==b; }

but I agree that sometimes you want to check if it's actually the same object.

we were talking about predef::`==() vs ::`==()

and now you bring in lfun::`==()

how does that fit in?

btw: i still miss an explanation for why my sample code crashes.

greetings, martin.

On Fri, Jan 14, 2005 at 03:45:02PM +0100, Henrik Grubbström (Lysator) @ Pike (-) developers forum wrote:

...

btw: i still miss an explanation for why my sample code crashes.

What code?

i sent it before in this thread. Message-ID: 20050112210441.GA4072@email.archlab.tuwien.ac.at

is the importer missing messages?

greetings, martin.