How to correctly do a do_action/add_action and Class in PHP 5.3?

I think the problem is that there are too many people trying to answer a question, such as here http://wordpress.stackexchange.com/questions/48085/add-action-reference-a-class

In my case I am using a do_action in my themes template

Which is best….

class mytheme_do_header_content{ 

	public function __construct() {

         add_action( 'mytheme_do_header', array( $this, 'mytheme_do_header_content_make' ) );

    }

	function mytheme_do_header_content_make(){

	//some code goes here
	}

	public function __destruct() {
		mytheme_do_header_content::destruct();
    }
}
new mytheme_do_header_content();

or this

class mytheme_do_header_content{ 

	public function __construct() {

		//some code goes here
	}

	public function __destruct() {
		mytheme_do_header_content::destruct();
    }
}
add_action( 'mytheme_do_header', array( $this, 'mytheme_do_header_content_make' ) );

or something else

Thanks