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I'm trying to implement a globally accessible undo/redo functionality in my Rust app via the undo crate. Additionally I am using enum_dispatch to handle the dynamic dispatch of my dyn AppActions, such as AddName or AddPhoneNumber.

However I'm running into the issue of needing to mutably borrow self more than once when I want to add a phone number or add a name to state. This is because I need to mutate some field of my state (names or phone_numbers) to add some data, and I need to mutate history so we have a record of these changes which can be undone/redone.But this leads me to mutably borrowing our state twice, once for the history, and once for whatever field we're wanting to add data to. Now I know one solutions to this problem, as discussed here, is borrowing specific fields from self, rather then the whole self. But for this approach to work we need to provide our AppAction implementers with some type attributes, so that when we pass them into self.history.apply(), we can also pass in self.names or self.phone_numbers, which have types Vec and Vec, respectively.

This sounds simple enough, but as it's unclear to me how to do this given the limitations of enum_dispatch. I thought that I could add associated types to AppAction , similar to the way undo::Action has associated typesTarget,Output, and Error. So for AddName, Target=Vec and for AddPhoneNumber Targe=Vec. But for reasons described in this issue, enum_dispatch does not allow you to add associated types to your trait definition. Is there some other way to add these type arguments to my AppAction implementers, AddName and AddPhoneNumber?

In the referenced issue, OP mentions:

I should wrap the associated type in another enum. Maybe it's not necessary for enum_dispatch to provide a general solution. Users should customize themselves. I'll close the issue.

However I'm not really sure what they mean by this or how to apply this to my particular case. Dopes OP suggest that we have some Enum, AppActionType as Target instead of AppState? Or is OP essentially suggesting not to use enum_dispatch for cases where implementer methods need differently typed values?

If anyone would like to play with the actual code, I put it in this repo.

I am trying to make a game of checkers, and right now I'm building the board. The board is a 2-dimensional array of integers that I'm changing based on where the pieces should be.

dear friends hope you all doing well. I have built a simple web application by reactJs, and I got a lot of warnings, and I searched ad there is a lot of the same question, I couldn't any solution, please help if anyone knows. here are the codes.

*index.js:1 Warning: Encountered two children with the same key, [object Object]. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version.

I'd like to implement a scheduling application where Person X can create an event at a specific time add it to their Google Calendar. Then Person Y should be able to sign up for that same event and get it added to their Google Calendar. Person X should also be able to reschedule the event as well. I'm having some trouble understanding how to design this, and would appreciate some pointers.

So Person X can authenticate on the client side and create the event, but then the server would need to store that event ID so that Person Y can sign up. But how does the server invite Person Y on behalf of Person X? I'm trying to authenticate using a service account but I'm getting There was an error contacting the Calendar service: Error: Service accounts cannot invite attendees without Domain-Wide Delegation of Authority. when I try creating an invite server-side and adding attendees. This seems like a fundamental issue where service accounts can't invite random attendees unless they're in a GSuite domain.

Applications like Calendly can basically do this (you can sign up on someone else's calendar then get invited to a Google Calendar event they organized), so I'm sure this is doable.

Here's my basic test code: this works without the attendees field, but fails with the aforementioned error if it's set.

I have a multidimensional array where I would like to remove a specific layer of the data. Basically, I would like to remove all the labels that are numeric aka the [0] => Array, [1] => Array, [2] => Array, and [3] => Array.

Here's the array I have currently:

I have 2 multi-dimensional arrays. Essentially, one of them is an array that is constantly updated. I would like to find the updates aka additions and deletions between the arrays. For instance, I have some data as follows:

Updated/new array (Array #1):

I am having a very difficult time understanding how borrowing works, and I can't for the life of me work out why these two cases are so different. The part that does work was inspired from https://users.rust-lang.org/t/rust-mutability-moving-and-borrowing-the-straight-dope/22166, the part that doesn't is what I am trying to achieve with a Response object from reqwest.

About a couple of weeks ago, I started learning about Regular Expressions. For practice, I thought of extracting different topics(along with their respective times) present in the description section in youtube videos(youtube uses this to slice the progress bar and each slice represents different topic). Example: for https://www.youtube.com/watch?v=E4M_IQG0d9g, the description looks something like below