diff rust/hg-core/src/revlog/node.rs @ 44502:166349510398

revlog: using two new functions in C capsule from Rust code

We expose `index_length` and `index_node` in the C capsule, so that
the Rust representation of the C index can implement the `RevlogIndex`
trait.

Because our `Node` is actually a one-field struct, we have
to decorate it for direct FFI exchange with the C `char*`

It would be a good thing to get a length from the C layer, but doing
so right now would probably interfere with the upcoming changes that
will happen there for the hash length.

Differential Revision: https://phab.mercurial-scm.org/D8152

--- a/rust/hg-core/src/revlog/node.rs	Tue Feb 18 19:11:14 2020 +0100
+++ b/rust/hg-core/src/revlog/node.rs	Mon Jan 13 19:31:33 2020 +0100
@@ -44,6 +44,7 @@
 /// [`nybbles_len`]: #method.nybbles_len
 /// [`ExactLengthRequired`]: struct.NodeError#variant.ExactLengthRequired
 #[derive(Clone, Debug, PartialEq)]
+#[repr(transparent)]
 pub struct Node {
     data: NodeData,
 }