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Best practices for circular shift (rotate) operations in C++
... Warning: This code is broken if INT is a signed integer and the sign is set! Test for example rol<std::int32_t>(1 << 31) which should flip over to 1 but actually becomes -1 (because the sign is retained).
– Nobody
Jun 2 '14 at 20:49
...
Function that creates a timestamp in c#
...k = Environment.TickCount % 1000; int ms = (tick >= MOffset) ? (tick - MOffset) : (1000 - (MOffset - tick)); ms = Math.Min(999, Math.Max(0, ms));
– Redwolf
Apr 24 '17 at 15:38
...
Do try/catch blocks hurt performance when exceptions are not thrown?
During a code review with a Microsoft employee we came across a large section of code inside a try{} block. She and an IT representative suggested this can have effects on performance of the code. In fact, they suggested most of the code should be outside of try/catch blocks, and that only importa...
Elegant way to invert a map in Scala
...ve), e.g., from Map[A,B], you can't get Map[B,A], but rather you get Map[B,Set[A]], because there might be different keys associated with same values. So, if you are interested in knowing all the keys, here's the code:
scala> val m = Map(1 -> "a", 2 -> "b", 4 -> "b")
scala> m.groupB...
Regular expressions in C: examples?
...rn;
PCRE2_SPTR subject;
int errornumber;
int i;
int rc;
PCRE2_SIZE erroroffset;
PCRE2_SIZE *ovector;
size_t subject_length;
pcre2_match_data *match_data;
char * RegexStr = "(?:\\D|^)(5[1-5][0-9]{2}(?:\\ |\\-|)[0-9]{4}(?:\\ |\\-|)[0-9]{4}(?:\\ |\\-|)[0-9]{4})(?:\\D|$)";
char * source = "5111 2222 3...
What are the applications of binary trees?
...pplications where data is constantly entering/leaving, such as the map and set objects in many languages' libraries.
Binary Space Partition - Used in almost every 3D video game to determine what objects need to be rendered.
Binary Tries - Used in almost every high-bandwidth router for storing router...
When to use a key/value store such as Redis instead/along side of a SQL database?
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Combining C++ and C - how does #ifdef __cplusplus work?
...+ source.
One reason to discourage people from using the compile C as C++ setting is because this means their source code is no longer portable. That setting is a project setting and so if a .c file is dropped into another project, it will not be compiled as c++. I would rather people take the time...
error: ‘NULL’ was not declared in this scope
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How to upload a file to directory in S3 bucket using boto
...ite('.')
sys.stdout.flush()
k = Key(bucket)
k.key = 'my test file'
k.set_contents_from_filename(testfile,
cb=percent_cb, num_cb=10)
[UPDATE]
I am not a pythonist, so thanks for the heads up about the import statements.
Also, I'd not recommend placing credentials inside your own source co...