check | Super basic CHECK , DCHECK , and NOTREACHED | Reflection library
kandi X-RAY | check Summary
kandi X-RAY | check Summary
Super basic CHECK(), DCHECK(), and NOTREACHED() macro implementations.
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QUESTION
In some legacy code I came across the following null pointer check.
...ANSWER
Answered 2022-Mar-28 at 12:46Ordered comparison between a pointer and an integer is ill-formed in C++ (even when the integer is a null pointer constant such as it is in this case). The risk is that compilers are allowed to, and do, refuse to compile such code.
You can rewrite it as either of these:
QUESTION
I saw a video about speed of loops in python, where it was explained that doing sum(range(N))
is much faster than manually looping through range
and adding the variables together, since the former runs in C due to built-in functions being used, while in the latter the summation is done in (slow) python. I was curious what happens when adding numpy
to the mix. As I expected np.sum(np.arange(N))
is the fastest, but sum(np.arange(N))
and np.sum(range(N))
are even slower than doing the naive for loop.
Why is this?
Here's the script I used to test, some comments about the supposed cause of slowing done where I know (taken mostly from the video) and the results I got on my machine (python 3.10.0, numpy 1.21.2):
updated script:
...ANSWER
Answered 2021-Oct-16 at 17:42From the cpython source code for sum
sum initially seems to attempt a fast path that assumes all inputs are the same type. If that fails it will just iterate:
QUESTION
I have newly installed
...ANSWER
Answered 2021-Jul-28 at 07:22You are running the project via Java 1.8 and add the --add-opens
option to the runner. However Java 1.8 does not support it.
So, the first option is to use Java 11 to run the project, as Java 11 can recognize this VM option.
Another solution is to find a place where --add-opens
is added and remove it.
Check Run configuration in IntelliJ IDEA (VM options field) and Maven/Gradle configuration files for argLine
(Maven) and jvmArgs
(Gradle)
QUESTION
version pip 21.2.4 python 3.6
The command:
...ANSWER
Answered 2021-Nov-19 at 13:30It looks like setuptools>=58
breaks support for use_2to3
:
So you should update setuptools
to setuptools<58
or avoid using packages with use_2to3
in the setup parameters.
I was having the same problem, pip==19.3.1
QUESTION
After updating Android Studio to Arctic Fox and Android Gradle plugin to 7.0.0 I'm facing this warning, I mean the app can be built successfully nonetheless of this warning but what I am missing here? What's the problem here?
According to the official View Binding reference, I'm enabling it the right way. here is my build.gradle if anyone is interested in checking.
There are some related questions but I don't think they are relevant in this situation.
...ANSWER
Answered 2022-Jan-06 at 11:08Remove equal sign. On the screenshot you use Kotlin configuration, but Groovy is needed here. See the difference:
QUESTION
I've downloaded Android Studio from the official website, the one for M1 chip (arm).
Basically running it for the first time, the error is the following:
...ANSWER
Answered 2021-Nov-07 at 09:40This is what solved it for me on my M1.
- Go to Android Studio Preview and download the latest Canary build for Apple chip (Chipmunk). Don't worry this is just to get through the initial setup.
- Unpack it, run it, let it install all the SDK components, accept licenses, etc as usual.
- Once it's done, simply close it and delete it.
Now when you start your stable Android Studio (Arctic Fox) you should not see the error.
QUESTION
These two loops are equivalent in C++ and Rust:
...ANSWER
Answered 2022-Jan-12 at 10:20Overflow in the iterator state.
The C++ version will loop forever when given a large enough input:
QUESTION
Uploading an iOS app to App Store Connect with Xcode (Automatically manage signing) and received this error:
The following errors occurred while locating and generating signing assets. ...
Communication with Apple failed. You haven't been given access to cloud-managed distribution certificates. Please contact your team's Account Holder or an Admin to give you access. If you need further assistance, contact Apple Developer Program Support at https://developer.apple.com/support
I have checked:
- the cert is installed and valid
- I have access to Certificates, Identifiers & Profiles
ANSWER
Answered 2021-Oct-18 at 01:45the cert is installed and valid
That doesn't matter. New in Xcode 13, if you choose Automatic signing, Apple tries to do cloud-based signing; it doesn't even see the certificate that's on your computer.
But you do not have the cloud-based signing privilege, so it fails.
You have two choices:
Get the privilege. It is really worth it, because cloud-based signing is great! It allows you to distribute from an archive to App Store Connect without having any distribution identity or distribution certificate at all. This totally solves the problem that there's only one distribution certificate at a time.
Switch to manual signing. Now the distribution certificate on your computer will be used. You'll need explicit access to the distribution profile too, obviously; the whole export resigning will be manual. That might be simplest if you're in a hurry.
QUESTION
Why does the TypeScript compiler compile its optional chaining and null-coalescing operators, ?.
and ??
, to
ANSWER
Answered 2021-Nov-04 at 17:40You can find an authoritative answer in microsoft/TypeScript#16 (wow, an old one); it is specifically explained in this comment:
That's because of
document.all
[...], a quirk that gets special treatment in the language for backwards compatibility.
QUESTION
I was checking the code of the toolz library's groupby
function in Python and I found this:
ANSWER
Answered 2021-Sep-22 at 13:05This is a somewhat confusing trick to save a small amount of time:
We are creating a defaultdict
with a factory function that returns a bound append
method of a new list instance with [].append
. Then we can just do d[key(item)](item)
instead of d[key(item)].append(item)
like we would have if we create a defaultdict
that contains lists. If we don't lookup append
everytime, we gain a small amount of time.
But now the dict
contains bound methods instead of the lists, so we have to get the original list instance back via __self__
.
__self__
is an attribute described for instance methods that returns the original instance. You can verify that with this for example:
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