Pike-devel August 2005

pike-devel@lists.lysator.liu.se

9 participants
14 discussions

type incompatibilities in connection with inheritance?
by Martin Bähr 11 Aug '05

11 Aug '05

hi, the tutorial makes this mysterious claim: http://pike.ida.liu.se/docs/tutorial/oop/access_control.xml If a class has a constructor (that is, a method called create) it can be a good idea to declare it static. It is not supposed to be called except during the construction of the object, and if it is not static there may be some type incompatibilities in connection with inheritance. what exactly is that supposed to mean? i understand the use of static to protect create from access from the outside, but what kind of type incompatibilities can there be for inheritance? and how can static protect against them? greetings, martin.

3 5

module can change mappings and multisets but not arrays or other types?
by Martin Bähr 08 Aug '05

08 Aug '05

hi, while playing around with modules, i observed the following: variables in modules are readonly, when accesses directly, and trying to change them from the outside gives an error. however trying to change then from the inside is either silently ignored or succeeds: int i=7; string s="foo"; mapping dict = ([ "foo":8 ]); array list = ({ 5 }); multiset mset = (< "foo" >); void set(mixed var) { // ignored: i=(int)var; s[0]=((string)var)[0]; dict += ([ "baz":var ]); list +=({ var }); list[0] = (int)var; // succeeds: dict->foo=var; dict->bar=var; mset[var] = 1; mset += (< var >); } shouldn't all of them fail and produce an error? greetings, martin.

7 12

GTK.DrawingArea won't work.
by 墳墓 07 Aug '05

07 Aug '05

I'm trying to develope my application with Pike and GTK, but when I used GTK.DrawingArea to draw a line, it doesn't work. I'm not sure if I misused GTK.DrawingArea, because I can't find example program that also use DrawingArea Error message and my code listed below, any suggestion? It says: Gdk-CRITICAL **: file gdkgc.c: line 51 (gdk_gc_new_with_values): assertion `window != NULL' failed. Gdk-CRITICAL **: file gdkgc.c: line 456 (gdk_gc_set_foreground): assertion `gc != NULL' failed. Gdk-CRITICAL **: file gdkdraw.c: line 65 (gdk_draw_line): assertion `drawable != NULL' failed. Here is my code: #!/usr/bin/pike int main () { GTK.setup_gtk(); GTK.Window MainWin = 0; GTK.Widget w = GTK.DrawingArea()->set_usize(100,100); GDK.GC gc = GDK.GC(w)->set_foreground( GDK.Color(255,0,0) ); w->draw_line ( gc , 10 , 10 , 100 , 100 ); MainWin = GTK.Window ( GTK.WINDOW_TOPLEVEL ); MainWin->set_title ( "Testing" ); MainWin->add ( w ); MainWin->show_all(); GTK.main(); return 0; }

2 2

http://pike.ida.liu.se/ down?
by Martin Bähr 05 Aug '05

05 Aug '05

hi, the webserver on http://pike.ida.liu.se/ seems to be down. any ideas what's wrong? the host is reachable, ssh is answering, although i can not log in, which i could before. that suggests that pike.ida.liu.se is pointing to a different (or freshly installed) machine. greetings, martin.

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Pike-devel August 2005