comparison rust/hg-core/src/revlog/node.rs @ 46435:2e2033081274

rust: replace trivial `impl From …` with `#[derive(derive_more::From)]`

Crate docs: https://jeltef.github.io/derive_more/derive_more/from.html

Differential Revision: https://phab.mercurial-scm.org/D9875

46434:3e2d539d0d1a

///
/// All methods that create a `Node` either take a type that enforces
/// the size or return an error at runtime.
///
/// [`nybbles_len`]: #method.nybbles_len
#[derive(Copy, Clone, Debug, PartialEq, BytesCast)]
#[repr(transparent)]
pub struct Node {
    data: NodeData,
}

/// The node value for NULL_REVISION
pub const NULL_NODE: Node = Node {
    data: [0; NODE_BYTES_LENGTH],
};

impl From<NodeData> for Node {
    fn from(data: NodeData) -> Node {
        Node { data }
    }
}

/// Return an error if the slice has an unexpected length
impl<'a> TryFrom<&'a [u8]> for &'a Node {
    type Error = ();

46435:2e2033081274

///
/// All methods that create a `Node` either take a type that enforces
/// the size or return an error at runtime.
///
/// [`nybbles_len`]: #method.nybbles_len
#[derive(Copy, Clone, Debug, PartialEq, BytesCast, derive_more::From)]
#[repr(transparent)]
pub struct Node {
    data: NodeData,
}

/// The node value for NULL_REVISION
pub const NULL_NODE: Node = Node {
    data: [0; NODE_BYTES_LENGTH],
};

/// Return an error if the slice has an unexpected length
impl<'a> TryFrom<&'a [u8]> for &'a Node {
    type Error = ();