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How can I build a small operating system on an old desktop computer? [closed]
...e sure that whatever you choose to target has a readily available and well-tested compiler for it. You do not want to be writing an OS and a compiler at the same time.
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How to choose an AES encryption mode (CBC ECB CTR OCB CFB)?
...y background. Cryptography is extremely subtle and it's nigh impossible to test the security of a system.
Comparison of the modes
Encryption only:
Modes that require padding:
Like in the example, padding can generally be dangerous because it opens up the possibility of padding oracle attacks. The e...
Need to reset git branch to origin version
...ch
git reset --hard origin/mybranch
(Make sure that you reference your latest commit in a separate branch, like you mention in your question)
Note that just after the reset, mybranch@{1} refers to the old commit, before reset.
But if you had already pushed, see "Create git branch, and revert ori...
Why should hash functions use a prime number modulus?
...ng to be clustered in just m number of buckets, where m = table_length/GreatestCommonFactor(table_length, x). (It is trivial to verify/derive this). Now you can do one of the following to avoid clustering
Make sure that you don't generate too many hashCodes that are multiples of another hashCode li...
Capture Image from Camera and Display in Activity
...s increased type safety via ActivityResultContract, and provides hooks for testing these flows" - source.
The API was added in androidx.activity 1.2.0-alpha02 and androidx.fragment 1.3.0-alpha02.
So you are now able to do something like:
val takePicture = registerForActivityResult(ActivityResul...
What's the difference between Ruby's dup and clone methods?
...zen object is also frozen (whereas a dup of a frozen object isn't).
class Test
attr_accessor :x
end
x = Test.new
x.x = 7
x.freeze
y = x.dup
z = x.clone
y.x = 5 => 5
z.x = 5 => TypeError: can't modify frozen object
Another difference is with singleton methods. Same story here, dup doesn't ...
How to check if a variable is a dictionary in Python?
... your code when there are more flexible, idiomatic expressions.
is is a test for object identity. It does not support inheritance, it does not support any abstraction, and it does not support the interface.
So I will provide several options that do.
Supporting inheritance:
This is the first re...
Do on-demand Mac OS X cloud services exist, comparable to Amazon's EC2 on-demand instances? [closed]
...use. Or at least a higher speed cable/DSL broadband connection. On my last test ~3Mbps seemed sufficient on the low bandwidth profile (they have multiple bandwidth connection profiles, low, medium, high, optimized for some bandwidth ranges). I didn't test on the higher ones. Your mileage may vary.
...
Why does the MongoDB Java driver use a random number generator in a conditional?
...zed to negative 1:
private int logit = -1;
In the try block, make the test:
if( !ok && (logit = (logit + 1 ) % 10) == 0 ) { //log error
This always logs the first error, then every tenth subsequent error. Logical operators "short-circuit", so logit only gets incremented on an actua...
Apply multiple functions to multiple groupby columns
...
@slackline yes. i just tested it and it works fine. Ted must have just created the frame a few different times and since it was created via random number generation, the df data to actually generate the data was different than the one ultimately us...