Ahh yes, I've been bitten by this limitation a few times, quite
agravating. I would definitly like to have this work.
Shane
phpsurf wrote:
> the problem is that if you define some function :
>
> function someFunc(&myParam) {
> ...
> }
>
> then you can call :
> someFunc($someVar);
>
> but not :
> define("MY_CONSTANT", 0);
> someFunc(MY_CONSTANT);
>
> the goal is not to pass a constant by reference, but to be allowed to
> (exceptionnaly) pass a constant as a parameter to a function that was
> designed to receive parameters by reference.
>
> and this could also let people define default values for params and still
> have them passed by reference ...
>
>
>>-----Original Message-----
>>From: Andi Gutmans [mailto:[EMAIL PROTECTED]]
>>Sent: mercredi 29 mai 2002 17:26
>>To: Stig S. Bakken; Jason T. Greene
>>Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
>>Subject: [PHP-DEV] Re: [Zend Engine 2] Re: [PHP-DEV] [RESENT] [PATCH]
>>Allow constants / expressions to be passed by reference]
>>
>>
>>I don't see any reason to allow passing non-variables by reference.
>>It is semantically incorrect.
>>
>>Andi
>>
>>At 09:40 29/05/2002 +0200, Stig S. Bakken wrote:
>>
>>>If this patch doesn't break anything, and it doesn't give us any
>>>difficulties with ZE2 or major design issues, I'm +1.
>>>
>>> - Stig
>>>
>>>On Tue, 2002-05-28 at 21:12, Jason T. Greene wrote:
>>>
>>>>Due to this patch being sent during the msession discussion,
>>>
>>it has not
>>
>>>>been noticed, so I am resending.
>>>>
>>>>
>>>>-Jason
>>>>----
>>>>
>>>
>>>>From: Jason Greene <[EMAIL PROTECTED]>
>>>>To: [EMAIL PROTECTED]
>>>>Cc: [EMAIL PROTECTED], [EMAIL PROTECTED]
>>>>Subject: [PHP-DEV] [PATCH] Allow constants / expressions to be passed
>>>
>>>by reference
>>>
>>>>Date: 25 May 2002 02:18:52 -0500
>>>>
>>>>Problem
>>>>-------
>>>>
>>>>There are some scenarios where a function requires the
>>>
>>ability to modify
>>
>>>>parameters that may also be optional. Optional parameters work well,
>>>>except in the scenario where all of the pass by reference
>>>
>>parameters can
>>
>>>>be optional. ex the socket_select() function. Since select is
>>>>argument-result, all three arrays that are taken as input
>>>
>>must be passed
>>
>>>>by reference, yet any can be excluded. So for example if you were
>>>>calling socket_select with a read socket array, a write socket array,
>>>>yet no exception array (quite common), you are currently forced to do
>>>>something like the following:
>>>>
>>>>$wfds = array($sock1, $sock2);
>>>>$rfds = array($sock3, $sock4);
>>>>$null = NULL;
>>>>
>>>>socket_select($rfds, $wfds, $null);
>>>>
>>>>
>>>>I have ran into this problem before several times while developing in
>>>>user space. (Especially when passing around semi-complex data
>>>>structures)
>>>>
>>>>Proposed Solution
>>>>------------------
>>>>
>>>>Allow all expressions to be passed by reference. This will allow
>>>>something like the following
>>>>
>>>>function normalize(&$element_tree, &$node_mapping, $max_depth){
>>>>//Code
>>>>}
>>>>
>>>>normalize($my_tree, NULL, 25000);
>>>>
>>>>
>>>>Patch
>>>>------
>>>>
>>>>I have attached a patch against ZE2 that accomplishes this.
>>>>
>>>>
>>>>Thanks,
>>>>-Jason
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>----
>>>>
>>>
>>>>Index: zend_compile.c
>>>>===================================================================
>>>>RCS file: /repository/ZendEngine2/zend_compile.c,v
>>>>retrieving revision 1.285
>>>>diff -u -r1.285 zend_compile.c
>>>>--- zend_compile.c 23 Apr 2002 18:06:53 -0000 1.285
>>>>+++ zend_compile.c 25 May 2002 06:45:21 -0000
>>>>@@ -1271,7 +1271,7 @@
>>>> op = ZEND_SEND_REF;
>>>> break;
>>>> default:
>>>>- zend_error(E_COMPILE_ERROR, "Only
>>>
>>>variables can be passed by reference");
>>>
>>>>+ op = ZEND_SEND_VAR;
>>>> break;
>>>> }
>>>> }
>>>>Index: zend_execute.c
>>>>===================================================================
>>>>RCS file: /repository/ZendEngine2/zend_execute.c,v
>>>>retrieving revision 1.341
>>>>diff -u -r1.341 zend_execute.c
>>>>--- zend_execute.c 8 May 2002 18:43:19 -0000 1.341
>>>>+++ zend_execute.c 25 May 2002 06:45:25 -0000
>>>>@@ -2292,10 +2292,6 @@
>>>> NEXT_OPCODE();
>>>> }
>>>> case ZEND_SEND_VAL:
>>>>- if
>>>
>>>(EX(opline)->extended_value==ZEND_DO_FCALL_BY_NAME
>>>
>>>>- &&
>>>
>>>ARG_SHOULD_BE_SENT_BY_REF(EX(opline)->op2.u.opline_num, EX(fbc),
>>>EX(fbc)->common.arg_types)) {
>>>
>>>>- zend_error(E_ERROR,
>>>
>>>"Cannot pass parameter %d by reference", EX(opline)->op2.u.opline_num);
>>>
>>>>- }
>>>> {
>>>> zval *valptr;
>>>> zval *value;
>>>>@@ -2329,7 +2325,8 @@
>>>>
>>>
>>>zend_ptr_stack_push(&EG(argument_stack), varptr);
>>>
>>>> NEXT_OPCODE();
>>>> }
>>>>- zend_error(E_ERROR, "Only
>>>
>>>variables can be passed by reference");
>>>
>>>>+ /* Should only occur with an
>>>
>>>uninitialized variable */
>>>
>>>>+ goto send_by_var;
>>>> }
>>>> NEXT_OPCODE();
>>>> case ZEND_SEND_VAR:
>>>>
>>>>----
>>>>
>>>
>>>>--
>>>>PHP Development Mailing List <http://www.php.net/>
>>>>To unsubscribe, visit: http://www.php.net/unsub.php
>>>>----
>>>>
>>>
>>>>--
>>>>PHP Development Mailing List <http://www.php.net/>
>>>>To unsubscribe, visit: http://www.php.net/unsub.php
>>>
>>
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>>PHP Development Mailing List <http://www.php.net/>
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>>
>
>
>
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