Here’s a straight forward implementation of the md5sum command that computes and displays the MD5 of the file specified on the command-line. It needs to be linked against the OpenSSL library (gcc md5.c -o md5 -lssl) to work. It’s pure C, but you should be able to adapt it to your C++ application easily enough. … Read more
You can’t do what you’re trying to do: bash arrays are one-dimensional $ declare -A PERSONS $ declare -A PERSON $ PERSON[“FNAME”]=’John’ $ PERSON[“LNAME”]=’Andrew’ $ declare -p PERSON declare -A PERSON='([FNAME]=”John” [LNAME]=”Andrew” )’ $ PERSONS[1]=([FNAME]=”John” [LNAME]=”Andrew” ) bash: PERSONS[1]: cannot assign list to array member You can fake multidimensionality by composing a suitable array index … Read more
Like described by Jon Skeet in this SO answer, it is best practice to pick some prime numbers and multiply these with the single hash codes, then sum everything up. public int GetHashCode() { unchecked { int hash = 17; // Maybe nullity checks, if these are objects not primitives! hash = hash * 23 … Read more
This hash function is similar to a Linear Congruential Generator (LCG – a simple class of functions that generate a series of psuedo-random numbers), which generally has the form: X = (a * X) + c; // “mod M”, where M = 2^32 or 2^64 typically Note the similarity to the djb2 hash function… a=33, … Read more
You can compare hashes directly for equality: hash1 = {‘a’ => 1, ‘b’ => 2} hash2 = {‘a’ => 1, ‘b’ => 2} hash3 = {‘a’ => 1, ‘b’ => 2, ‘c’ => 3} hash1 == hash2 # => true hash1 == hash3 # => false hash1.to_a == hash2.to_a # => true hash1.to_a == hash3.to_a … Read more
This is not possible, for the sake of keeping Redis simple. Quoth Antirez, creator of Redis: Hi, it is not possible, either use a different top-level key for that specific field, or store along with the filed another field with an expire time, fetch both, and let the application understand if it is still valid … Read more
This sounds like a non-repeating random number generator. There are several possible approaches to this. As described in this article, we can generate them by selecting a prime number p and satisfies p % 4 = 3 that is large enough (greater than the maximum value in the output range) and generate them this way: … Read more
Generics in Java doesn’t allow creation of arrays with generic types. You can cast your array to a generic type, but this will generate an unchecked conversion warning: public class HashTable<K, V> { private LinkedList<V>[] m_storage; public HashTable(int initialSize) { m_storage = (LinkedList<V>[]) new LinkedList[initialSize]; } } Here is a good explanation, without getting into … Read more
You’ll need to use Javascript to read this. There are a few different options – upon page load, you could use an XmlHTTPRequest (AJAX request) to tell the server what the additional URL parameters were. Alternatley you could check to see if there are additional parameters (also via Javascript), and if you find any, post … Read more