Return current template in use

I have the same question.
I need to apply some filters on wp_head if I’m using a specific template on a single post. Is there a way to check?

i have some trouble like this and after look in to code of this plugin i have simple function for check what template the post curent belong to. add below function to your functions.php file

//$templateName is file name of template
function is_post_template($templateName) {
    global $post;
    $currentTemplate = get_post_meta( $post->ID, '_wp_post_template', true );
    if ($currentTemplate == $templateName)
        return true;

    return false;
}