struct view_data HELP please

[namerpus18]

Hello everyone,

I just want a little enlightment about this script. What does the last line does? 

Thank you so much

 

struct view_data {
    uint16 class_;
    t_itemid
        weapon,
        shield, //Or left-hand weapon.
        robe,
        head_top,
        head_mid,
        head_bottom;
    uint16
        hair_style,
        hair_color,
        cloth_color,
        body_style;
    char sex;

unsigned dead_sit : 2; // 0: Standing, 1: Dead, 2: Sitting