rust: changed Graph.parents to return [Revision; 2]
This will allow for simple iteration on parent revisions,
such as:
for parent in graph.parents(rev)?.iter().cloned()
This seems to be a zero overhead abstraction once built in
release mode.
Differential Revision: https://phab.mercurial-scm.org/D5415
// 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; 2], GraphError>;
}
#[derive(Clone, Debug, PartialEq)]
pub enum GraphError {
ParentOutOfRange(Revision),
}