Dependencies

aldarien/contract/app/Definition/Contract.php

@@ -0,0 +1,20 @@
+<?php
+namespace App\Definition;
+
+trait Contract
+{
+    protected static $instance = null;
+
+	private function __construct() {}
+
+	protected static function getInstance()
+	{
+		if (self::$instance == null) {
+			self::$instance = static::newInstance();
+		}
+		return self::$instance;
+	}
+
+	abstract protected static function newInstance();
+}
+?>