Re: Overloading of operators '==' and '!='

 > ...
 > if($list[$i] eq $mypoint) { ...
 > ...

Yep, this works :-)
But (and there always has to be a 'but' :-)
it shows that the meaning of '==' and 'eq'
operators is opposite to what it should be:

   for Perl strings
     '==' does reference comparison,
     'eq' does content comparison
   for (some) PerlQt Objects
     '==' does content comparison,
     'eq' (accidentally) does reference comparison

Things may be reverted to what they ought to be
by changing the overloading in Qt.pm
from '==' and '!=' to 'eq' and 'ne'.
That is, change
     "==" => "Qt::base::_overload::op_equal",
     "!=" => "Qt::base::_overload::op_not_equal",
to
     "eq" => "Qt::base::_overload::op_equal",
     "ne" => "Qt::base::_overload::op_not_equal",

For the test script below, which tests some Qt::Point
expressions, this gives the desired result

    $p1 == $p1 .... yes
    $p1 == $p2 .... no
    $p1 == $p3 .... no
    $p1 != $p1 .... no
    $p1 != $p2 .... yes
    $p1 != $p3 .... yes
    $p1 eq $p1 .... yes
    $p1 eq $p2 .... no
    $p1 eq $p3 .... yes
    $p1 ne $p1 .... no
    $p1 ne $p2 .... yes
    $p1 ne $p3 .... no

Well, might this be a solution ?

Johannes Plass

------------------------------------------------------

use Qt;

my $p1 = Qt::Point(1,0);
my $p2 = Qt::Point(2,0);
my $p3 = Qt::Point(1,0);

sub test { printf("%s .... %s\n",$_[0], eval $_[0] ? "yes" : "no"); }

test '$p1 == $p'.$_ foreach (1,2,3);
test '$p1 != $p'.$_ foreach (1,2,3);
test '$p1 eq $p'.$_ foreach (1,2,3);
test '$p1 ne $p'.$_ foreach (1,2,3);