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What integer hash function are good that accepts an integer hash key?
... a multiplier that is in the order of your hash size (2^32 in the example) and has no common factors with it. This way the hash function covers all your hash space uniformly.
Edit: The biggest disadvantage of this hash function is that it preserves divisibility, so if your integers are all divisibl...
Difference between socket and websocket?
...lications that require a permanent connection to its server. On the other hand, plain sockets are more powerful and generic. They run over TCP/IP but they are not restricted to browsers or HTTP protocol. They could be used to implement any kind of communication.
No. There is no reason.
...
How do you declare an interface in C++?
...
To expand on the answer by bradtgmurray, you may want to make one exception to the pure virtual method list of your interface by adding a virtual destructor. This allows you to pass pointer ownership to another party without expos...
Detecting programming language from a snippet
...words. Then you compare the occurences of these words with known snippets, and compute the probability that this snippet is written in language X for every language you're interested in.
http://en.wikipedia.org/wiki/Bayesian_spam_filtering
If you have the basic mechanism then it's very easy to add...
HashSet vs. List performance
...be better off using a List<T>.
I did a test for this on my machine, and, well, it has to be very very small to get an advantage from List<T>. For a list of short strings, the advantage went away after size 5, for objects after size 20.
1 item LIST strs time: 617ms
1 item HASHSET strs t...
How do you prevent IDisposable from spreading to all your classes?
...ble from spreading. Some classes need to be disposed, like AutoResetEvent, and the most efficient way is to do it in the Dispose() method to avoid the overhead of finalizers. But this method must be called somehow, so exactly as in your example the classes that encapsulate or contain IDisposable hav...
Is delete this allowed?
...omment : yosefk.com/c++fqa/heap.html#fqa-16.15
– Alexandre C.
Jun 30 '10 at 15:51
1
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Java - escape string to prevent SQL injection
I'm trying to put some anti sql injection in place in java and am finding it very difficult to work with the the "replaceAll" string function. Ultimately I need a function that will convert any existing \ to \\ , any " to \" , any ' to \' , and any \n to \\n so that when the string is e...
UnicodeEncodeError: 'latin-1' codec can't encode character
...nto the range 0x80-0x9F. Code page 1252 is often confused with ISO-8859-1, and it's an annoying but now-standard web browser behaviour that if you serve your pages as ISO-8859-1, the browser will treat them as cp1252 instead. However, they really are two distinct encodings:
>>> u'He said \...
What's this =! operator? [duplicate]
...
That's two operators, = and !, not one. It might be an obfuscated way of writing
a = !b;
if (a) {
// whatever
}
setting a to the logical inverse of b, and testing whether the result is true (or, equivalently, whether b was false).
Or it migh...