ID: 8740
User Update by: [EMAIL PROTECTED]
Old-Status: Feedback
Status: Open
Bug Type: *General Issues
Description: $this can't be passed by reference inside of constructor
no, that's the opposite of what i wanna get.
$this->b = new b($this); is instancing and assigning a new object of type b to
$this->b BUT not passing $this by reference to b's constructor.
$foo =& new foobar(); ofcourse doesn't change this behaviour.
Previous Comments:
---------------------------------------------------------------------------
[2001-01-16 13:15:12] [EMAIL PROTECTED]
try this:
$foo =& new foobar();
---------------------------------------------------------------------------
[2001-01-16 12:55:26] [EMAIL PROTECTED]
just in case, if i change a's constructor to
function a($i) {
$this->bla = $i;
$this->b = new b(&$this); // note the &
}
it doesn't work either.
---------------------------------------------------------------------------
[2001-01-16 12:51:24] [EMAIL PROTECTED]
the following code-snippet illustrated the problem:
-----
class a
{
var $bla; // some intvalue
var $b; // object of type b
function a($i) {
$this->bla = $i;
// the next line ain't working in the constructor
//$this->b = new b($this);
}
function x() {
// the next line behaves like expected
$this->b = new b($this);
}
function p() {
echo "a::p ".$this->bla."<br>";
}
}
class b
{
var $a; // reference to object of type a
function b(&$a) {
$this->a = &$a;
}
function p() {
echo "b::p ".$this->a->bla."<br>";
}
}
$a = new a(10);
$a->x(); // works
$a->p();
$a->b->p();
$a->bla = 11;
$a->p();
$a->b->p();
-----
output:
a::p 10
b::p 10
a::p 11
b::p 11
-----
this is the wanted behaviour. var $a->b contains a object of type b which contains a
reference back to object $a. object b is instanciated and assigned via the $a->x()
methodcall. so far, nothing special.
when i want to get rid of the additional method in a (that's the x() method) and
instanciate b inside of a's constructor and assign it to $a->b with $this, $a->b->a
doesnt contain a reference to the calling a object but a copy of it.
thus, $this isn't really working inside of an object's constructor.
afaik do other languages have the same limitation of using $this inside of the
constructor due to address-calculation issues.
---------------------------------------------------------------------------
Full Bug description available at: http://bugs.php.net/?id=8740
--
PHP Development Mailing List <http://www.php.net/>
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
To contact the list administrators, e-mail: [EMAIL PROTECTED]
