use super::{Expression, Rule};
use rustables_sys as sys;
use std::os::raw::c_char;

/// A counter expression adds a counter to the rule that is incremented to count number of packets
/// and number of bytes for all packets that has matched the rule.
pub struct Counter;

impl Expression for Counter {
    fn to_expr(&self, _rule: &Rule) -> *mut sys::nftnl_expr {
        try_alloc!(unsafe { sys::nftnl_expr_alloc(b"counter\0" as *const _ as *const c_char) })
    }
}