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When would anyone use a union? Is it a remnant from the C-only days?
...typedef union
gcrypt.h: union
gcrypt.h: union
gcrypt.h: union
gmp-i386.h: union {
ieee754.h:union ieee754_float
ieee754.h:union ieee754_double
ieee754.h:union ieee854_long_double
ifaddrs.h: union
jpeglib.h: union {
ldap.h: union mod_vals_u {
ncurses.h: union
newt.h: union {
obstack.h...
How to extract a git subdirectory and make a submodule out of it?
...
Both CoolAJ86 and apenwarr answers are very similar. I went back and forth between the two trying to understand bits that were missing from either one. Below is a combination of them.
First navigate Git Bash to the root of the git repo...
How do you Encrypt and Decrypt a PHP String?
...hese password-hashing algorithms:
Argon2
scrypt
bcrypt
PBKDF2-SHA256 with 86,000 iterations
Never use a general-purpose hash function (MD5, SHA256) for password storage.
Don't encrypt URL Parameters. It's the wrong tool for the job.
PHP String Encryption Example with Libsodium
If you are on PHP &l...
How dangerous is it to compare floating point values?
...at's not a perfect square.
Double rounding. On some systems (particularly x86), floating point expressions are evaluated in higher precision than their nominal types. This means that when one of the above types of rounding happens, you'll get two rounding steps, first a rounding of the result to the...
C++ IDE for Linux? [closed]
...
86
votes
My personal favorite is the CodeLite 2.x IDE.
see: http://www.codelite.org
...
How do emulators work and how are they written? [closed]
...r processors using very elegant object oriented programs. For example, an X86 processor would need something to maintain the state of registers (easy), something to maintain the state of memory (easy), and something that would take each incoming command and apply it to the current state of the machi...
Fastest hash for non-cryptographic uses?
...g;
}
?>
And the output
1 - crc32b 0.111036300659
2 - crc32 0.112048864365
3 - md4 0.120795726776
4 - md5 0.138875722885
5 - sha1 0.146368741989
6 - adler32 0.15501332283
7 - tiger192,3 0.177447080612
8 - tiger160,3 0.179498195648
9 - tiger128,3 0.184012889862
10 - ripemd128 0.184052705765
11...
Understanding the Event Loop
...
86
1: If we are talking about a single-threaded application, then what processes setTimeouts wh...
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...)
0.217 sec (2.17us/itn) - [i for i in old_list] (a list comprehension)
0.186 sec (1.86us/itn) - copy.copy(old_list)
0.075 sec (0.75us/itn) - list(old_list)
0.053 sec (0.53us/itn) - new_list = []; new_list.extend(old_list)
0.039 sec (0.39us/itn) - old_list[:] (list slicing)
So the fastest is list ...
What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?
...it's not going to be faster than one cycle. Now, although it is not so on x86/amd64, 32-bit integers may not be even addressable. In such a case working on them requires additional ops to extract the 32-bits from, say, 64-bit aligned units. See also the linked question. C++ standard is written so th...