dutiful | Keep your application preferences in sync | Data Processing library
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kandi X-RAY | dutiful Summary
Keep your application preferences in sync
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QUESTION
I have a wrapper around a C-API:
...ANSWER
Answered 2021-Jun-07 at 22:24Short answer: just cast it to *mut T
and pass it to C.
Long answer:
It's best to first understand why casting *const T
to *mut T
is prone to undefined behaviour.
Rust's memory model ensures that a &mut T
will not alias with anything else, so the compiler is free to, say, clobber T entirely and then restore its content, and the programmer could not observe that behaviour. If a &mut T
and &T
co-exists and point to the same location, undefined behaviour arises because what will happen if you read from &T
while compiler clobbers &mut T
? Similarly, if you have &T
, the compiler assumes no one will modify it (excluding interior mutability through UnsafeCell
), and undefined behaviour arise if the memory it points to is modified.
With the background, it's easy to see why *const T
to *mut T
is dangerous -- you cannot dereference the resulting pointer. If you ever dereference the *mut T
, you've obtained a &mut T
, and it'll be UB. However, the casting operation itself is safe, and you can safely cast the *mut T
back to *const T
and dereference it.
This is Rust semantics; on the C-side, the guarantee about T*
is very weak. If you hold a T*
, the compiler cannot assume there are no sharers. In fact, the compiler cannot even assert that it points to valid address (it could be null or past-the-end pointer). C compiler cannot generate store instructions to the memory location unless the code write to the pointer explicitly.
The weaker meaning of T*
in C-side means that it won't violate Rust's assumption about semantics of &T
. You can safely cast &T
to *mut T
and pass it to C, provided that C-side never modifies the memory pointed by the pointer.
Note that you can instruct the C compiler that the pointer won't alias with anything else with T * restrict
, but as the C code you mentioned is not strict with const
-correctness, it probably does not use restrict
as well.
QUESTION
In a form, I'd like a user to be able to dynamically maintain a list of phone numbers, including adding/removing numbers as they wish.
I'm currently maintaining the list of numbers in a published array property of an ObservableObject class, such that when a new number is added to the array, the SwiftUI form will rebuild the list through its ForEach loop. (Each phone number is represented as a PhoneDetails
struct, with properties for the number itself and the type of phone [work, cell, etc].)
Adding/removing works perfectly fine, but when I attempt to edit a phone number within a TextField, as soon as I type a character, the TextField loses focus.
My instinct is that, since the TextField is bound to the phoneNumber property of one of the array items, as soon as I modify it, the entire array within the class publishes the fact that it's been changed, hence SwiftUI dutifully rebuilds the ForEach loop, thus losing focus. This behavior is not ideal when trying to enter a new phone number!
I've also tried looping over an array of the PhoneDetails
objects directly, without using an ObservedObject class as an in-between repository, and the same behavior persists.
Below is the minimum reproducible example code; as mentioned, adding/removing items works great, but attempting to type into any TextField immediately loses focus.
Can someone please help point me in the right direction as to what I'm doing wrong?
...ANSWER
Answered 2021-May-16 at 08:18try this:
QUESTION
When I used git init .
in the directory whose contents were about to be stored using git
, it dutifully created a local repository in a subdirectory named .git
.
Under macOS, this is annoying, since by default any .xxxx
file is "hidden".
How can I use a different name than
.git
without it affecting use of subsequentgit
commands?If I move the (renamed)
.git
to another local directory, how do I modify subsequentgit
commands so they will find the repository?
ANSWER
Answered 2021-May-13 at 14:40It's possible, but a nag, I guess. You can setup environment variable $GIT_DIR
to specify where the git repo is.
https://git-scm.com/book/en/v2/Git-Internals-Environment-Variables
Just in case, it makes sense to have the directory named .git
. This is so that it is hidden on purpose so that users don't mess with it unintentedly.
QUESTION
I have the following Prepared Statement which I send via the JDBC driver to an Oracle database:
...ANSWER
Answered 2021-Apr-13 at 01:42You would often use NULL
for this purpose. Something like this:
QUESTION
Im currently building a filter that gets executed upon click on react.
The initial value of the filter in the state is as follow:
...ANSWER
Answered 2021-Jan-22 at 19:21Seems like you have an array of dogsCharacteristicsData
.
In order to filter it by a filter, define a consistent filtering format, like you've done: say filter: { breedFor: [], temperaments: [], size: [] }
.
Then in order to filter you can do something like:
QUESTION
I have a very simple test application:
...ANSWER
Answered 2021-Jan-16 at 17:01The first issue is due to the fact that you used a blocking function (which should never happen) in event-driven systems like ui frameworks. What happens is that the for loop with the sleep function prevents Qt to correctly process events, including input events: your second click gets "queued" and can only be processed as soon as the control is returned to the event manager (when the function finally returns), and since, at that point, you've re-enabled the button, only then the previously queud event gets finally processed (and the function is called again).
The solution is simple: avoid any situation like this, if you need a time-based iteration, use a QTimer, if you need parallel and non blocking processing, use a QThread.
QUESTION
I have attempted to follow the documentation about setting up an SQS Dead Letter Queue for my Lambda on AWS but I can't seem to get the errors to pass through to it.
I have a Lambda on eu-west-2
ANSWER
Answered 2020-Nov-05 at 22:46The reason why your DLQ does not work is because using Test
button or invoking function using:
QUESTION
When doing a code review, I stumbled on some code that looks like this:
...ANSWER
Answered 2020-Oct-13 at 20:54The Stream will be closed, if it is returned inside the try-with block.
This question was already asked, see here:
If it safe to return an InputStream from try-with-resource
QUESTION
CentOS Linux release 7.6.1810 (Core)
Eclipse Version: 2020-06 (4.16.0) Build id: 20200615-1200
When I use the dialog box invoked by Ctrl F ( command: Find and Replace ) I get the search results highlighted in a faint yellow.
This makes it very hard for me to see the result.
I dutifully went to Google and found that the highlighted search result color can be changed by going to:
Window > Preferences > General > Editors > Text Editors > Annotations > Search Results
Interestingly, when I got there the highlight color was not yellow. It was a light blue.
Still, I changed the color to red,hit apply, apply and close, and restarted Eclipse.
No change.
Any ideas what I can to get that color to change?
...ANSWER
Answered 2020-Aug-27 at 16:36You mean the Selection background color that can be changed in Window > Preferences: General > Editors > Text Editors:
QUESTION
I cannot for the life of me figure out how to tell who is making a request to my integration.
Say I set up api key "123abc" and give it to Bob. My API method requires a key, so Bob dutifully includes it in the header of his request (x-api-key=123abc). Bob is able to successfully reach my endpoint, but my integration has no idea if the person who made the request is Bob (123abc) or Doug (456def) or Suzy (789ghi).
It seems Gateway does not pass the api key along with the request. The integration has business logic that must be respected, based on who makes a request. So I need to know which api key was used, or have some other way of associating a request with a person. I don't see any other identifying traits in the request headers or body (except perhaps X-Amzn-Trace-Id?). I've read countless articles and googled all manner of phrases. Maybe I'm missing some high level concept that would illuminate my search. Please enlighten me.
...ANSWER
Answered 2020-Aug-10 at 17:08So AWS API Gateways have support for something called custom authorizer.
What is custom athorizer?
It is just a door keeper lambda that will show allow/deny for each request.
This lambda gets methodArn
as an argument and you can call denyAll
or allowAll
on this methodArn
to get AuthPolicy
.
Once you get the AuthPolicy
you can set the api key or you can even get the policy context and add your own key value pairs. You also get the api-key as an input parameter with name authorizationToken
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Install dutiful
On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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