Create a function reference to a static method on a class

namespace HH;

function class_meth(
  string $cls_name,
  string $meth_name,
);

The global function class_meth('cls_name', 'meth_name') creates a reference to a static method on the specified class.

To identify the class you can specify either a constant string containing a fully qualified class name including namespace, or a class reference using MyClassName::class.

Hack provides a variety of methods that allow you to construct references to methods for delegation. The methods in this group are:

• class_meth for static methods on a class
• fun for global functions
• inst_meth for instance methods on a single object
• meth_caller for an instance method where the instance will be determined later
• Or use anonymous code within a lambda expression.

Example

<?hh // strict
class C {
    public static function isOdd(int $i): bool { return $i % 2 == 1;}
}
$data = Vector { 1, 2, 3 };

// Each result returns Vector { 1, 3 }
$data->filter(class_meth('C', 'isOdd'));
$data->filter(class_meth(C::class, 'isOdd'));
$data->filter($n ==> { return C::isOdd($n); });

Parameters

• string $cls_name A constant string with the name of the class, or a class reference using FullClassName::class.
• string $meth_name A constant string with the name of the static class method.

Returns

• $func_ref - A fully typed function reference to the static class method.