imag/libimagmail/src/iter.rs

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2016-10-04 12:19:36 +00:00
//! Module for the MailIter
//!
//! MailIter is a iterator which takes an Iterator that yields `Ref` and yields itself
//! `Result<Mail>`, where `Err(_)` is returned if the Ref is not a Mail or parsing of the
//! referenced mail file failed.
//!
use mail::Mail;
use result::Result;
use libimagref::reference::Ref;
use std::marker::PhantomData;
struct MailIter<'a, I: 'a + Iterator<Item = Ref<'a>>> {
_marker: PhantomData<&'a I>,
i: I,
}
impl<'a, I: Iterator<Item = Ref<'a>>> MailIter<'a, I> {
pub fn new(i: I) -> MailIter<'a, I> {
MailIter { _marker: PhantomData, i: i }
}
}
impl<'a, I: Iterator<Item = Ref<'a>>> Iterator for MailIter<'a, I> {
type Item = Result<Mail<'a>>;
fn next(&mut self) -> Option<Result<Mail<'a>>> {
self.i.next().map(Mail::from_ref)
}
}