#[macro_use]
extern crate serde_derive;
extern crate serde;

use std::str::FromStr;
use std::fmt::Debug;
use std::convert::From;
use serde::{Deserialize, Deserializer};
use serde::de::Error;

fn parse1<'de, D,T,C>(deserializer: D, mut converter: C) -> Result<C::Output, D::Error>
where
    D: Deserializer<'de>,
    T: FromStr,
    C: Converter<T>,
{
    let s: String = Deserialize::deserialize(deserializer)?;
    let s = s.split_whitespace()
            .filter_map(|s| s.parse::<T>().ok());
    Ok(converter.process(s))
}

trait Converter<T> {
    type Output;
    fn process<I: Iterator<Item = T>>(&mut self, it: I) -> Self::Output;
}