Anonymous class creation

Rationale

Throw-away classes / migration.

newinstance() declaration

  &lang.Object newinstance(
    string classname, 
    mixed[] args,
    string bytes 
  )

Arguments: - baseclass is the fully qualified class name of the interface to implement or the abstract class to inherit from.

- args are the constructor arguments

- source is the class' sourcecode, including a leading "{" and a trailing "}"

Creating an anonymous instance will bail with an error... - ...in case the class "classname" cannot be found.

- ...in case the source code specified by the bytes argument doesn't parse.

- ...in case classname refers to an interface and the declared class fails to implement the interface.

Creating an anonymous instance of an interface:

  $filter= &newinstance('io.collections.iterate.IterationFilter', array(&$properties), '{
    var
      $properties= NULL;
      
    function __construct(&$properties) {
      $this->properties= &$properties;
    }
    
    function accept(&$element) {
      return (
        4 == sscanf(basename($element->getURI()), "%[^-]-%d-%d-%d.log", $type, $y, $m, $d) &&
        $this->properties->hasSection($type)
      );
    }
  }');

n/a

Slower than declaring real classes.

This patch will increase the XP framework's minor version (4.1.0)

- http://experiments.xp-framework.net/?people,friebe,newinstance Experiment

- http://experiments.xp-framework.net/?people,friebe,jay,demo/newinstance.xp XP language equivalent

- http://xp-framework.net/rfc/contrib/rfc0080.diff Patch

- friebe, Mon Nov 27 12:11:33 CET 2006 I think we should increase only the minor version because this functionality is intended for user source only and not for core components. Because no core components use this functionality, a major version jump seems not to make sense.

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