Re: Multi-Method Dispatch in PHP 5.1?

Hello George, Tuesday, April 20, 2004, 8:57:31 PM, you wrote: > On Apr 20, 2004, at 2:51 PM, Andrey Hristov wrote: >> Quoting Sebastian Bergmann <sebastian@php.net>: >> >>> Since we introduce class type hints in PHP 5.0 I think it would be a >>> good thing [tm] to add multi-method dispatch in PHP 5.1. >>> >>> What I mean by this would be to allow for the following: >>> >>> class Foo { >>> public function doSomething(Foo $foo) {} >>> >>> public function doSomething(Bar $bar) {} >>> } >>> >>> How complicated would this be to implement? >>> >> Hi, >> yesterday while waiting at the UBahn (Metro) station I came to the >> idea such >> thing can me made in userland. func_get_args() can help combined with >> get_type() for simple types. if it's class than => use also the class >> name if >> you want. >> >> <?php >> class fubar { >> protected function >> doSomething_integer_integer_double($i1,$i2,$f) { >> $a = func_get_args();var_dump(__METHOD__, $a); >> } >> protected function doSomething_integer_double($i,$f) { >> $a = func_get_args();var_dump(__METHOD__, $a); >> } >> >> public function doSomething() { >> $args = func_get_args(); >> $method_name = __FUNCTION__; >> foreach ($args as $v) { >> $method_name .= "_".gettype($v); >> } >> if (method_exists($this, $method_name)) { >> return call_user_func_array(array($this, >> $method_name), >> $args); >> } >> } >> }//class fubar >> >> $a = new fubar(); >> $a->doSomething(1, 2.0); >> $a->doSomething(3,4, 5.0); >> ?> > The problem with this is that that integer may well be a string when > you look at it. There's no good way to do this past discriminating > between scalar, array and object (by type, of course). I personally > think that that is fine (adding an array typehint would be nice). Somewhere at my server should be a patch for "array". For some reason i was too lazy to ask for that to commit again before RC1. I you still want this just ask Andi/Zeev again. -- Best regards, Marcus mailto:helly@php.net