Struct Ipc 

pub struct Ipc;

Writes frames down so they can be kept or sent, and reads them back.

The second implementor of Codec, and from another crate — the first was python/’s registry of dump/load pairs — which is what keeps the hole a hole. A unit struct because the format is the format and there is nothing to configure; whoever runs the engine hands it in, and a store and a wire get the same bytes because what a frame weighs has one answer.

It refuses an opaque that is not a frame rather than guessing. A graph carrying tensors and rows wants both codecs, which is what python/’s does: a frame comes here, anything else goes to its registry.

Trait Implementations

impl Codec for Ipc

fn packed(&self, value: &Value) -> Result<Value, CodecError>

This value in a shape that can leave the process, at any depth. Whatever carries nothing opaque comes back as it was: this is asked of every value that crosses.

fn unpacked(&self, value: &Value) -> Result<Value, CodecError>

And the live one back, on the side that will use it.