Function cookie_factory::combinator::cond

pub fn cond<F, W: Write>(condition: bool, f: F) -> impl SerializeFn<W>
where
    F: SerializeFn<W>,

Applies a serializer if the condition is true

use cookie_factory::{gen, combinator::{cond, string}};

let mut buf = [0u8; 100];

{
  let (buf, pos) = gen(cond(true, string("abcd")), &mut buf[..]).unwrap();
  assert_eq!(pos, 4);
  assert_eq!(buf.len(), 100 - 4);
}

assert_eq!(&buf[..4], &b"abcd"[..]);