Anonymous class extends protected constructor

[josbert-m]

Description

The following code:

<?php

namespace Tests\Unit\Definers;

use PHPUnit\Framework\TestCase;
use DI\Definers\Singleton;

class SingletonTest extends TestCase
{
    public function test_create_singleton(): void
    {
        $House = new class extends Singleton
        {
            public int $peoples = 0;

            protected function factory(): void
            {
                $this->peoples = 2;
            }
        };

        $house_instance = $House::get();

        $this->assertInstanceOf($House::class, $house_instance);
    }
}

The Singleton DI\Definers\Singleton code:

<?php

namespace DI\Definers;

class Singleton
{
    protected static self $instance;

    /**
     * Deny instancing
     */
    final protected function __construct() { }

    /**
     * Deny cloning
     */
    final protected function __clone(): void { }

    /**
     * Return singleton instance
     *
     * @return self
     */
    final public static function get(): self
    {
        if (!isset(static::$instance)) {
            static::$instance = new static();
        }

        return static::$instance;
    }
}

Resulted in this output:

There was 1 error:

1) Tests\Unit\Definers\SingletonTest::test_create_singleton
Error: Call to protected DI\Definers\Singleton::__construct() from scope Tests\Unit\Definers\SingletonTest

/home/josbert-m/php/packages/di/tests/Unit/Definers/SingletonTest.php:12

But I expected this output instead:

PHPUnit 9.6-dev by Sebastian Bergmann and contributors.

.                                                                   1 / 1 (100%)

Time: 00:00.068, Memory: 6.00 MB

OK (1 test, 1 assertion)

When the extended class not is a anonymous class works, but this is not working

PHP Version

PHP 8.1.13

Operating System

Ubuntu 22.04

[KapitanOczywisty]

Creating anonymous class is equal to class definition and class instantiation, so error seems to be correct.

[josbert-m]

I understand, my error 😅, some way to assign the anonymous class to variable, but without instantiation?

[damianwadley]

There is no mechanism for defining a class anonymously without instantiating it - that's not a use case the anonymous classes feature is intended to cover.

Just create a named class. It's fine.