attron

static VALUE
window_attron(VALUE obj, VALUE attrs)
{
#ifdef HAVE_WATTRON
    struct windata *winp;
    VALUE val;

    GetWINDOW(obj,winp);
    val = INT2FIX(wattron(winp->window,NUM2INT(attrs)));
    if (rb_block_given_p()) {
        rb_yield(val);
        wattroff(winp->window,NUM2INT(attrs));
        return val;
    }
    else{
        return val;
    }
#else
    return Qtrue;
#endif
}