src/Container/Singleton.php
public function make()
    {
        if( !$this->instance ){
            $this->instance = call_user_func($this->builder);
        }

        return $this->instance;
    }
public function make()
    {
        if( !$this->instance ){
            $this->instance = call_user_func($this->builder);
        }

        return $this->instance;
    }
Get or make the singleton instance.

@return mixed