Hi - I'm green to Perl and I'm having problem understanding some inheritance behavior. Maybe it's obvious but I'm missing it (I used to be C++)
The class structure is the following: I have 2 classes built on top of each other, on top of Socket IO::Socket::INET ==> remote ==> top
'remote' defines 2 methods : 'open' and 'request'
'top' overloads 'open' and add methods 'new' that is called by the application actually using it and a method 'sysread' to overload default read 
#pseudo code in class 'top'
sub new {
 my $class = shift;
 .
 .
 return open($class , $some_args);
}

sub open {
 my $class = shift;
 .
 .
 # I guess this is where the blessing of to $class happens ?
 my $sock = $class::SUPER->new($some_args);
 .
 .
 return $sock->request($some_args);
}

sub sysread {
 my $class = shift;
 .
 .
 $class::SUPER->read($var, 20);
 .
 .
 return $sock->request($some_args);
}

#pseudo code in class 'remote'
sub sysreadline(*;$) { 
    my ($handle, $maxnap) = @_;

        .
    $handle = qualify_to_ref($handle, caller());
        sysread($handle, $var, 10);
        .
}


sub request {
 my $self = shift;
 .
 sysreadline($self, 10);
 .  
}

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What happens is that a call to "top::new", calls "top::open" that calls "remote::request" as expected and then in 'sysreadline', the call to 'sysread' calls IO::Socket::INET::sysread, not 'top::sysread'. I thought in IO::Socket::INET::new, the object was blessed as a 'top' so 'sysread' would call the overloaded one
After that, all subsequent call to 'sysread' by the application with a 'top' object call the overloaded 'sysread'
(NB: my "real" problem is about a multiple inheritance, but I'm trying first to understand a basic behavior here, sorry)

In reply to inheritance problem by philippe44

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