rfc:generator-delegation

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rfc:generator-delegation [2015/03/09 19:51]
rdlowrey fixed bad javascript syntax reference
rfc:generator-delegation [2017/09/22 13:28] (current)
Line 4: Line 4:
   * Author: Daniel Lowrey <rdlowrey@php.net>   * Author: Daniel Lowrey <rdlowrey@php.net>
   * Contributors: Bob Weinand <bwoebi@php.net>   * Contributors: Bob Weinand <bwoebi@php.net>
-  * Status: Under Discussion+  * Status: Implemented in 7.0
   * First Published at: http://wiki.php.net/rfc/generator-delegation   * First Published at: http://wiki.php.net/rfc/generator-delegation
  
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                 $send = false;                 $send = false;
             } else {             } else {
-                $throw $e;+                throw $e;
             }             }
         }         }
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 while($shared->valid()) { $shared->next(); } while($shared->valid()) { $shared->next(); }
 $delegator = delegator($shared); $delegator = delegator($shared);
-while($delegator->valid()) { $delegator->next(); } + 
-var_dump($delegator->getReturn()); /int(42)+foreach ($delegator as $value) { 
 +    var_dump($value); 
 +
 +var_dump($delegator->getReturn()); 
 + 
 +/
 +int(42) 
 +// This is our only output because no values are yielded 
 +// from the already-completed shared subgenerator 
 +*/
 </code> </code>
  
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 ==== Error States ==== ==== Error States ====
  
-There are two scenarios in which ''yield from'' usage can result in a fatal error or uncaught exception:+There are two scenarios in which ''yield from'' usage can result in an ''EngineException'':
  
   * Using ''yield from <expr>'' where <expr> evaluates to a generator which previously terminated with an uncaught exception results in an ''EngineException''.   * Using ''yield from <expr>'' where <expr> evaluates to a generator which previously terminated with an uncaught exception results in an ''EngineException''.
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 ===== Rejected Ideas ===== ===== Rejected Ideas =====
  
-The original version of this RFC proposed a ''yield *'' syntax. This was rejected in favor of +The original version of this RFC proposed a ''yield *'' syntax. The ''yield *'' syntax was rejected in favor of 
-''yield from'' on the basis that it would break backwards compatibility. Additionally, the ''yield *'' +''yield from'' on the basis that ''*'' would break backwards compatibility. Additionally, the ''yield *'' 
-form was considered less readable option that the current proposal.+form was considered less readable than the current proposal.
  
  
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-===== Proposed Voting Choices ===== +===== Vote =====
- +
-Two voting choices are proposed†:+
  
-  * **YES**, implement the ''yield from'' syntax allowing generator delegation in PHP 7*+A 2/3 "Yes" vote is required to implement this proposal. Voting will continue through March 29, 2015.
  
-  * **NO**, do not modify existing Generator behavior+<doodle title="Allow Generator delegation in PHP7" auth="rdlowrey" voteType="single" closed="true"> 
 +   * Yes 
 +   No 
 +</doodle>
  
-A 2/3 "Yes" vote is required to implement this proposal.+.
  
-†: The success of this vote depends on the success of the accompanying [[rfc:generator-return-expressions|Generator Return Expressions]] RFC. +The success of this vote depends on the success of the accompanying [[rfc:generator-return-expressions|Generator Return Expressions]] RFC. Should Generator Return Expressions be rejected the voting outcome of this RFC will be rendered moot.
-Should Generator Return Expressions be rejected the voting outcome of this RFC will be rendered moot.+
  
 ===== Patches and Tests ===== ===== Patches and Tests =====
  
-The current patch is approaching "final" status and can be found here:+The current patch is considered "final" and can be found here:
  
 https://github.com/bwoebi/php-src/commits/coroutineDelegation https://github.com/bwoebi/php-src/commits/coroutineDelegation
rfc/generator-delegation.1425930717.txt.gz · Last modified: 2017/09/22 13:28 (external edit)