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Remove the useless mutable reference for ActionClient#63

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Remove the useless mutable reference for ActionClient#63
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@drindr drindr commented Dec 5, 2025

Thanks for your nice crate.

Finding that to access the service or topic in the ActionClient, a mutable reference of ActionClient is required, I think it is totally unnecessary. It is almost impossible to modify them in other crate because most of the related methods are pub(crate) even private. Removing the &mut can make external design easier as well.

Copilot AI review requested due to automatic review settings December 5, 2025 06:11
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Pull request overview

This PR improves the API design of ActionClient by changing the accessor methods from returning mutable references (&mut) to immutable references (&). Since the underlying Client and Subscription types use interior mutability and expose methods that take &self, the mutable references were unnecessary and overly restrictive for API consumers.

  • Changed five accessor methods in ActionClient to return immutable references
  • Updated example code to reflect that ActionClient no longer needs to be mutable

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File Description
src/action/client.rs Changed goal_client(), cancel_client(), result_client(), feedback_subscription(), and status_subscription() methods to return immutable references instead of mutable references
examples/turtle_teleop/main.rs Removed mut keyword from rotate_action_client variable declaration since mutable access is no longer required

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