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use crate::message::WriteTo;

use std::io::Write;

struct Counter(usize);

impl Write for Counter {

    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {

        self.0 += buf.len();

        Ok(buf.len())

    }

    fn flush(&mut self) -> std::io::Result<()> {

        Ok(())

    }

}

pub fn size_of<'a, Msg: WriteTo<Input<'a> = Msg>>(msg: &Msg) -> crate::message::Result<usize> {

    let mut counter = Counter(0);

    Msg::write_to(msg, &mut counter)
?0
;

    Ok(counter.0)

}