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QUESTION
I'm trying to understand how the "fetch" phase of the CPU pipeline interacts with memory.
Let's say I have these instructions:
...ANSWER
Answered 2021-Jun-15 at 16:34It varies between implementations, but generally, this is managed by the cache coherency protocol of the multiprocessor. In simplest terms, what happens is that when CPU1 writes to a memory location, that location will be invalidated in every other cache in the system. So that write will invalidate the line in CPU2's instruction cache as well as any (partially) decoded instructions in CPU2's uop cache (if it has such a thing). So when CPU2 goes to fetch/execute the next instruction, all those caches will miss and it will stall while things are refetched. Depending on the cache coherency protocol, that may involve waiting for the write to get to memory, or may fetch the modified data directly from CPU1's dcache, or things might go via some shared cache.
QUESTION
Everyone, I have made my own style and add this to qml.qrc
then I calling it in main.cpp
:
ANSWER
Answered 2021-Jun-13 at 21:21i've founded solution: It is not possible to change the style on the fly, because QQC2 styling is based on QML type registration time file selection, but it is possible to:
unload all QML, destroy any existing QQmlEngine instance(s), call qmlClearTypeRegistrations(), call QQuickStyle::setStyle(), and then re-load the QML content so that QQC2 types are re-registered with the new style. This process should be clearly documented in QQuickStyle. Preferably, an example should be provided that uses QML Settings to retain the state of the UI, for example.
It is important to emphasize the warning in the qmlClearTypeRegistrations() docs:
Do not call this function while a QQmlEngine exists or behavior will be undefined. Any existing QQmlEngines must be deleted before calling this function. This function only affects the application global cache. Delete the QQmlEngine to clear all cached data relating to that engine.
QUESTION
I am using two instances of tinyMCE in shiny. I would like to save the content of both of these instances as a csv file using a single action button. I can use two action button but that defeats my goal. Not really great with javascript and how to make it work in R. I was able to source some code to save the output of first instance. Following is a working example.
...ANSWER
Answered 2021-Jun-13 at 13:37You can concatenate the input from two text in onclick
-
QUESTION
This article mentions:
If your app includes a custom backend server, ID tokens can and should be used to communicate securely with it. Instead of sending requests with a user’s raw uid which can be easily spoofed by a malicious client, send the user's ID token which can be verified via a Firebase Admin SDK (or even a third-party JWT library if Firebase does not have an Admin SDK in your language of choice). To facilitate this, the modern client SDKs provide convenient methods for retrieving ID tokens for the currently logged-in user. The Admin SDK ensures the ID token is valid and returns the decoded token, which includes the uid of the user it belongs to as well as any custom claims added to it.
From learning on Youtube, the raw uid
always seems to be used.
Eg:
...ANSWER
Answered 2021-Jun-13 at 00:45The UID of a user is a unique, constant identifier for that user. So if the same user logs in multiple times, they'll get the same UID.
It makes no sense to use the ID token as the identifier for the user in the database, as an ID token will change every hour.
You should continue to use the UID to identify the user, and only use the ID token when you need to verify the user's identity.
QUESTION
I am creating a feature that will heavily depend upon cookies with SameSite=None and secure flag set to true as described in https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite
Cookies with SameSite=None must now also specify the Secure attribute (they require a secure context/HTTPS).
This currently works on all modern browsers.
Is there any speculation that these cookies will be deprecated in the (near) future?
...ANSWER
Answered 2021-Jun-11 at 16:24Oh they're trying very hard to destroy 3rd party cookies altogether. Not sure if yours are third party or not.
https://blog.chromium.org/2020/01/building-more-private-web-path-towards.html
"we plan to phase out support for third-party cookies in Chrome. Our intention is to do this within two years"
Already every other Chrome update destroys integrations between sites that depend on the samesite behavior you mention.
This checkin reverted behavior to a more tolerant samesite behavior because a previous samesite change broke so many sites. but it won't last for long. They will re-add it in the future.
https://chromium.googlesource.com/chromium/src/+/fdfe7482acbb6a4f5605103ce7d2956e2336e27e
QUESTION
This is my html featuring "modern" web component template:
...ANSWER
Answered 2021-Jun-11 at 00:11template
tag content is not ignored by browsers.
Think of a template as a content fragment that is being stored for subsequent use in the document. While the parser does process the contents of the element while loading the page, it does so only to ensure that those contents are valid; the element's contents are not rendered, however.
So the contents is parsed and validated. table
elements have a specific list and order of permitted content. So when the template
content is parsed the unsupported content is removed from the table
.
You can see the same behavior if you use p
tags within a table.
QUESTION
if (std::abs(double1 - double2) < std::numeric_limits::epsilon())
std::cout<<"Equal";
else
std::cout<<"Not equal";
...ANSWER
Answered 2021-Jun-09 at 18:46Is this code with modern C++11/14/17/21 is still the way we should compare float and doubles, or now it's ok just to write
if (double1 == double2)
And compiler will handle the epsilon issue for us?
Both approaches function the same in modern C++ as they did in early C++.
Both approaches are also flawed.
Using
==
assumes that your code has accounted for any floating point rounding errors, and it's very rare/difficult for code to do that.Comparing against epsilon assumes that a reasonable amount of rounding error will be less than the constant epsilon, and that is very likely a wrong assumption!
- If your numbers have magnitude greater than
2.0
, your epsilon trick will be no different from direct comparison, and have the same flaws. Regardless of whether you use<
or<=
. - If your numbers have the same sign and a magnitude smaller than epsilon, your epsilon trick will say they are always equal, even if one is hundreds of times larger than the other. They would both be equal to zero, too.
- If your numbers have magnitude greater than
A wise approach may be to avoid writing code that depends on whether floating point numbers are equal. Instead test if they are relatively close, by some factor.
The code below will test whether two numbers are within about 0.01% of each other. Regardless of their scale.
QUESTION
I want to bring a principle of keywords to my project. I am using a bootstrap template for this one. However the template only allows tags with one word. Example:
The separation is done automatically by clicking on the space bar. However, I would like to allow several words, so create the separator with 2 spaces (It may not be the best way, I listen to your suggestions). This is a site related to the school environment, so the user can enter a program name with 2 words, currently I am able to do it with a / (without having touched the code)
I don't have a lot of code to give you other than this:
...ANSWER
Answered 2021-Jun-09 at 16:16Try using no-spacebar
option
QUESTION
We have a code in production that in some situation may left-shift a 32-bit unsigned integer by more than 31 bits. I know this is considered undefined behavior. Unfortunately we can't fix this right now, but we can work this around, if only we can assume how it works in practice.
On x86/amd64 I know processor for shifts uses only the appropriate less-significant bits of the shift count operand. So that a << b
is in fact equivalent to a << (b & 31)
. From the hardware design this makes perfect sense.
My question is: how does this work in practice on modern popular platforms, such as arm, mips, RISC and etc. I mean those that are actually used in modern PCs and mobile devices, not outdated or esoteric.
Can we assume that those behave the same way?
EDIT:
The code I'm talking about currently runs in a blockchain. It's less important how exactly it works, but at the very least we want to be sure that it yields identical results on all the machines. This is the most important, otherwise this can be exploited to induce a so-called chain split.
Fixing this means hassles, because the fix should be applied simultaneously to all the running machines, otherwise we are yet again at risk of the chain split. But we will do this at some point in an organized (controlled) manner.
Lesser problem with the variety of compilers. We only use GCC. I looked at the code with my own eyes, there's a
shl
instruction there. Frankly I don't expect it to be anything different given the context (shift operand comes from arbitrary source, can't be predicted at compile time).Please don't remind me that I "can't assume". I know this. My question is 100% practical. As I said, I know that on x86/amd64 the 32-bit shift instruction only takes 5 least significant bits of the bit count operand.
How does this behave on current modern architectures? We can also restrict the question to little-endian processors.
...ANSWER
Answered 2021-Jun-02 at 20:15With code that triggers undefined behavior, the compiler can just about do anything - well, that's why it's undefined - asking for a safe definition of undefined code doesn't make any sense. Theoretical evaluations or observing the compiler translating similar code or assumptions on what "common practice" might be won't really give you an answer.
Evaluating what a compiler really has translated your UB code to would probably be your only safe bet. If you want to be really sure what happens in the corner cases, have a look at the generated (assembly or machine) code. Modern debuggers give you the toolset to catch those corner cases and tell you what actually happens (the generated machine code is, after all, very well defined). This will be much simpler and much safer than to speculate on what code the compiler might probably emit.
QUESTION
I have trivial question and I saw the same questions here and there in the Internet. However, it doesn't work in my code.
let me explain the issue: I have very old SharePoint (2013 or even 2010). And there are bunch of lists with identical columns. I want to merge them into one common list.
What I've tried already:
- Tried to merge via SharePoint Designer. I stuck when I need to connect new page to Linked Source - I can't even choose data source
- this option is for modern SharePoint, as I understood: http://www.boostsolutions.com/blog/how-to-integrate-multiple-sharepoint-lists-into-one-list/
- This option uses Content Query Web Part. I couldn't find one in my SharePoint https://support.microsoft.com/en-us/office/when-to-use-the-content-query-web-part-or-the-content-search-web-part-in-sharepoint-346a0f48-38de-409b-8a58-3bdca1768929
Is there another way to merge several lists? Many thanks
...ANSWER
Answered 2021-Jun-08 at 16:11I found answer for my issue. The easiest way is to create Flow
- Create recurrence - schedule your task
- Use Get items - the items you'd like to move. In this action you should use advanced settings and choose filtering you wanna apply on your data (I've decieded that I need to copy every item that was created later than January 2021) - example. More about OData filters here.
- Fill in next step (applied to all) - example
- copy this Flow for every list you need to combine into one list
That's all actually. I created one more flow but this one is much easier. I hope it'll help
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