Closure issue [$25]

[ghost]

Zephir\ParseException: Syntax error in *******.zep on line 10

  let result = array_filter(array_keys(all_list), function(item) use (only_list) {
-------------------------------------------------------------------^

[Green-Cat]

Zephir does not support use() for closures.
As a work around you can put the parameters in an array and use call_user_func_array.

[KonstantinKuklin]

@Green-Cat Do you plan to support generators and coroutines?

[valVk]

how could we convert that syntax to the correct one?

For example I have this

class Functional {

    public static function array_map_recursive(callback, value) 
    {
        if (is_array(value)) {
            return array_map(function(value) use (callback) { return array_map_recursive(callback, value); }, value);
        }
        return call_user_func(callback, value);
    }

    public static function test_rec (item) 
    {
        return item . " +1";
    }
}

Thanks.

[baszczewski]

Use keyword is extremely useful. It allow us to inherit variables from the parent scope. Is there any plans to support it?

[fezfez]

Any news ?

[kristoftorfs]

Is there any news on this issue yet? I'm currently doing a rather large project in Phalcon, but would like to use Zephir instead of PHP for development. However, this is kind of a major issue (for me personally).

[dkeepersun]

yeah ,its really useful . so many closure i use in my project. its will be very important feature!

[kse300489]

Right now it can't be added to zephir, becouse anonimus functions in zephir it is not Closure like in php, it is simple function name. When you write in zephir:

return array_map(function(var item){ return item + 1; }, value);

Zephir simple create new function with unredable name, like:

function func_101193d7181cc88340ae5b2b17bba8a1(var item) {
  return item + 1;
}

and then use it like this

return array_map('func_101193d7181cc88340ae5b2b17bba8a1', value);

So anonimus functions in zephir it simple named functions.

[Jurigag]

Could this be somehow implemented @sjinks ? Lately i added factories to phalcon so for example we can do something like:

use Phalcon\Db\Adapter\Pdo\Factory;

$config = new Phalcon\Config\Ini('config.ini');
$di->setShared('db', Factory::load($config->database));

But obviously on this point it will create database adapter object, i just wonder if this could be implemented so i could add some method like loadAsCallback which will simply be:

public static function loadAsClosure(options) 
{
    return function() use (options) {
        return Factory::load(options);
    }
}

Or there is some other workaround for this? Is something like this gonna work:

public static function loadAsClosure(options) 
{
    var f;
    
    let this->options = options;

    let f = function() {
        return Factory::load(this->options);
    }

    f->bindTo(this);

    return f;
}

?

Well already can tell it won't work.

[kran]

use bindTo to solve this:

var dummy;
let dummy = new \stdClass();
let dummy->foo = "some variable";

(function(){
    var dummy = <\stdClass> this;
    echo dummy->foo;
})->bindTo(dummy);

[sergeyklay]

Should work in current development branch. Thank you for the contributing, and for helping us make Zephir better. Feel free to open a new in case of any issue.