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Accessing inactive union member and undefined behavior?
...object representation in the new type as described in 6.2.6 (a process sometimes called ‘‘type
punning’’). This might be a trap representation.
The situation with C++:
c++11
9.5 Unions [class.union]
In a union, at most one of the non-static data members can be active at any...
Real world use cases of bitwise operators [closed]
... values, since the medium may only be capable of transmitting one bit at a time.
Compression, Encryption
Both of these are heavily dependent on bitwise algorithms. Look at the deflate algorithm for an example - everything is in bits, not bytes.
Finite State Machines
I'm speaking primarily of the ki...
How to use JavaScript regex over multiple lines?
...pescript test I'm writing and presumably it will become more mainstream as time goes by.
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Best way to iterate through a Perl array
...the scope of the array actually keeps the array and re-uses the space next time. Generally, that should be fine (see comments).
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How to find and turn on USB debugging mode on Nexus 4
...About” screen, scroll to the bottom and tap on “Build number”
seven times.
Make sure you tap seven times. If you see
a “Not need, you are already a developer!” message pop up, then you know you have
done it correctly.
Done! By tapping on “Build number” seven times, you have unlo...
Guid is all 0's (zeros)?
...
Can't tell you how many times this has caught. me.
Guid myGuid = Guid.NewGuid();
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ASP.NET Web Site or ASP.NET Web Application?
...t will come up with new names for the DLL files generated by pages all the time. That can lead to having several close copies of DLL files containing the same class name,
which will generate plenty of errors. The Web Site project was introduced with Visual Studio 2005, but it has turned out not t...
Algorithm to generate a crossword
...decided to create as many crosswords as possible in an arbitrary amount of time. If you only have a small word list, then you'll get dozens of possible crosswords in 5 seconds. A larger crossword might only be chosen from 5-6 possibilities.
When placing a new word, instead of placing it immediatel...
Sort a text file by line length including spaces
...eld. I guess it's not crazy behaviour. It has this:
"Finally, there are times when it is convenient to force awk to rebuild the entire record, using the current value of the fields and OFS. To do this, use the seemingly innocuous assignment:"
$1 = $1 # force record to be reconstituted
print ...
How to replace ${} placeholders in a text file?
...!/bin/sh
#Set variables
i=1
word="dog"
#Read in template one line at the time, and replace variables (more
#natural (and efficient) way, thanks to Jonathan Leffler).
while read line
do
eval echo "$line"
done < "./template.txt"
Output:
#sh script.sh
the number is 1
the word is dog
...