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rust: rename local variables in AncestorsIterator::next It was confusing to have p1 and parents.1 ; (p1, p2) is clearer. Differential Revision: https://phab.mercurial-scm.org/D5365
author Georges Racinet <georges@racinet.fr>
date Tue, 04 Dec 2018 14:01:13 +0000
parents dbc28c91f7ff
children 18513d6ef7d4
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// Copyright 2018 Georges Racinet <gracinet@anybox.fr>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.
mod ancestors;
pub use ancestors::AncestorsIterator;

/// Mercurial revision numbers
///
/// As noted in revlog.c, revision numbers are actually encoded in
/// 4 bytes, and are liberally converted to ints, whence the i32
pub type Revision = i32;

pub const NULL_REVISION: Revision = -1;

/// The simplest expression of what we need of Mercurial DAGs.
pub trait Graph {
    fn parents(&self, Revision) -> Result<(Revision, Revision), GraphError>;
}

#[derive(Clone, Debug, PartialEq)]
pub enum GraphError {
    ParentOutOfRange(Revision),
}