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chandler-11 The Singleton Pattern Must Be a Class

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Closes #11.
This commit is contained in:
Ilya Bakhlin 2022-01-01 18:49:27 +01:00
parent 3ed115a9ed
commit b457218e26
3 changed files with 73 additions and 14 deletions
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29
composer.lock generated
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@ -4,7 +4,7 @@
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@ -2130,16 +2130,16 @@
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@ -2207,7 +2207,7 @@
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@ -2223,7 +2223,7 @@
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{
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@ -2305,16 +2305,16 @@
},
{
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@ -2360,7 +2360,7 @@
"description": "Loads and dumps YAML files",
"homepage": "https://symfony.com",
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"source": "https://github.com/symfony/yaml/tree/v5.4.2"
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@ -2376,7 +2376,7 @@
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"time": "2021-11-28T15:25:38+00:00"
"time": "2021-12-16T21:58:21+00:00"
},
{
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@ -4510,7 +4510,8 @@
"prefer-stable": false,
"prefer-lowest": false,
"platform": {
"php": "^7.3"
"ext-yaml": "*",
"php": "^7.4"
},
"platform-dev": [],
"plugin-api-version": "2.2.0"

42
src/Classes/Singleton.php Normal file
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@ -0,0 +1,42 @@
<?php
declare(strict_types = 1);
namespace Chandler\Classes;
use Chandler\Interfaces\Singleton as SingletonInterface;
/**
* @package Chandler\Classes
*/
abstract class Singleton implements SingletonInterface
{
/**
* @var array
*/
private static array $instances = [];
/**
* TODO: Add a description.
*
* @return void
*/
final private function __clone() {}
/**
* TODO: Add a description.
*/
abstract protected function __construct();
/**
* @return static
*/
public static function getInstance(): self
{
if (array_key_exists(static::class, self::$instances)) {
return self::$instances[static::class];
} else {
return self::$instances[static::class] = new static();
}
}
}

16
src/Interfaces/Singleton.php Normal file
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@ -0,0 +1,16 @@
<?php
declare(strict_types = 1);
namespace Chandler\Interfaces;
/**
* @package Chandler\Interfaces
*/
interface Singleton
{
/**
* @return static
*/
public static function getInstance(): self;
}