ensue | Function sequence with nested arrays of sequences | Functional Programming library

I am using SelectableText inside SingleChildScrollView.

I'm trying to design a double-entry ledger with DDD and running into some trouble with defining aggregate roots. There are three domain models:

1. LedgerLine: individual line items that have data such as amount, timestamp they are created at, etc.
2. LedgerEntry: entries into the ledger. Each entry contains multiple LedgerLines where the debit and credit lines must balance.
3. LedgerAccount: accounts in the ledger. There are two types of accounts: (1) internal accounts (e.g. cash) (2) external accounts (e.g. linked bank accounts). External accounts can be added/removed.

After reading some articles online (e.g. this one: https://lorenzo-dee.blogspot.com/2013/06/domain-driven-design-accounting-domain.html?m=0). It seems like LedgerEntry should be one aggregate root, holding references to LedgerLines. LedgerAccount should be the other aggregate root. LedgerLines would hold the corresponding LedgerAccount's ID.

While this makes a lot of sense, I'm having trouble figuring out how to update the balance of ledger accounts when ledger lines are added. The above article suggests that the balance should be calculated on the fly, which means it wouldn't need to be updated when LedgerEntrys are added. However, I'm using Amazon QLDB for the ledger, and their solutions engineer specifically recommended that the balance should be computed and stored on the LedgerAccount since QLDB is not optimized for such kind of "scanning through lots of documents" operation.

Now the dilemma ensues:

1. If I update the balance field synchronously when adding LedgerEntrys, then I would be updating two aggregates in one operation, which violates the consistency boundary.
2. If I update the balance field asynchronously after receiving the event emitted by the "Add LedgerEntry" operation, then I could be reading a stale balance on the account if I add another LedgerEntry that spends the balance on the account, which could lead to overdrafts.
3. If I subsume the LedgerAccount model into the same aggregate of LedgerEntry, then I lose the ability to add/remove individual LedgerAccount since I can't query them directly.
4. If I get rid of the balance field and compute it on the fly, then there could be performance problems given (1) QLDB limitation (2) the fact that the number of ledger lines is unbounded.

So what's the proper design here? Any help is greatly appreciated!

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We'd like to ensue that a user enters a value from a list of valid options. Since we found no way to define a preset of valid values, we are currently trying do it with an if statement.

However we have trouble finding out the if syntax for a OR operator.

What we currently have:

I will start with a brief introduction to what I'm doing.

I am writing a library for a microcontroller device that can be used to control a certain application on PC over UART. The first draft of the application was purely sequential - a set of functions that can be called from the library in order to send certain data to PC. This worked but had potential problems since the execution was sequential and if something went wrong, the whole program would collapse. I decided to incorporate freeRTOS into the library in order to have better control over the execution and there is where the problems ensued. I will try to the best of my abilities to bring the problem closer to you by presenting only the essential code parts.

Let me briefly give you a summed up review of the first version of the library. I will provide only the code that I think is essential.

Is there a strategy for safely allowing an ATL object to release itself in response to a Windows message or sink event?

In other words, let's say you have an ATL class that's subclassing some windows (using a message map) and/or sinking events from COM objects (using a sink map). And you'd like the class to release itself given a particular message or event. For example, you might want to release when a particular subclassed window receives WM_CLOSE, or you're sinking DWebBrowserEvents2 and want to release upon DISPID_ONQUIT.

I think the problem is that if you release in the middle of your message or event handler, the ATL framework might still have some processing to do afterward (even if you, say, do something like bHandled = TRUE). And if your object has been released/deleted at that point, then bad things will ensue.

Does anyone know of an approach to solve this? Thanks for any input.

I have a data 300 output .out files from which I need to obtain data. Generally the data is stored in them as:

I have coded the random sentence generator, which works. However, when it sends out the tweet, it only tweets one word or one letter. I do not really know what's going on. Here is the code for the sentence and for tweeting:

There is a white space under my footer which I cannot seem to fix. Hoping that one of you people can help me out here. I have tried to set all the margins to 0 but at this point I don't know anymore.

Beside the white space under the footer I am also open to suggestions or tips on how to improve my coding.