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How to count the number of set bits in a 32-bit integer?
...iently deal with any usage pattern or values you throw at it.
References:
https://graphics.stanford.edu/~seander/bithacks.html
https://en.wikipedia.org/wiki/Hamming_weight
http://gurmeet.net/puzzles/fast-bit-counting-routines/
http://aggregate.ee.engr.uky.edu/MAGIC/#Population%20Count%20(Ones%20Cou...
How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
... model. On selecting TNS to be the Connection Type, the Network Alias drop down did not show the expected entries in my tnsnames.ora file. To get around, I selected the Connection Type to be Basic, and entered the desired Hostname, Port and Service Name values from the tnsnames.ora file that works o...
Regex: ignore case sensitivity
...by preceding them with a minus sign (?-i).
Description is from the page:
https://www.regular-expressions.info/modifiers.html
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“User interaction is not allowed” trying to sign an OSX app using codesign
...rom it now and hope it keeps working.
Essentially, it looks like it comes down to -d system not actually working. So a lot of answers to other questions around here should probably be updated to reflect that.
security -v list-keychains -s "$KEYCHAIN" "$HOME/Library/Keychains/login.keychain"
securi...
boost::flat_map and its performance compared to map and unordered_map
...eUploader: {
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Is std::unique_ptr required to know the full definition of T?
...he implementation file seems less likely to be inadvertently removed later down the road by somebody who assumes the destuctor body was erased rather than deliberately left blank.
– Dennis Zickefoose
May 16 '11 at 2:04
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Is std::vector so much slower than plain arrays?
...t std::vector is "implemented as an array," blah blah blah. Today I went down and tested it, and it seems to be not so:
2...
How to check if an object is nullable?
...e already boxed the value to an object variable.
Microsoft documentation: https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/how-to-identify-a-nullable-type
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Learning to write a compiler [closed]
...ved with actually writing any code to create a compiler, but it does break down the compiler into its parts: phases and stages. It does describe the logic and algorithmic design approach without any specific language paradigm as it expresses the notations of an arbitrary language and alphabet. It is...
Change key pair for ec2 instance
...key).
If you still have SSH access, please use one of the answers below.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html#replacing-lost-key-pair
Here is what I did, thanks to Eric Hammond's blog post:
Stop the running EC2 instance
Detach its /dev/xvda1 volume (let's call ...