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What is a good Hash Function?
... informative link! I know a few analyses by Bob Jenkins and others which point to quite good universally acceptable hash functions but I haven't come across this one yet.
– Konrad Rudolph
Jul 2 '09 at 6:36
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Why does the C# compiler not fault code where a static method calls an instance method?
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UPDATE: Below answer was written in 2012, before the introduction of C# 7.3 (May 2018). In What's new in C# 7.3, the section Improved overload candidates, item 1, it is explained how the overload resolution rules have changed so that non-static overloads are discarded early. So...
How do I change the data type for a column in MySQL?
I want to change the data type of multiple columns from float to int. What is the simplest way to do this?
9 Answers
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Parse (split) a string in C++ using string delimiter (standard C++)
... from one string: <code>size_t last = 0; size_t next = 0; int index = 0; while (index<4) { next = str.find(delimiter, last); auto number = str.substr(last, next - last); IPv4[index++] = atoi(number.c_str()); last = next + 1; }</code>
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Pass a data.frame column name to a function
...want to save the user from typing all those quotes, one option might be to convert bare, unquoted column names to strings using deparse(substitute()):
new_column2 <- function(df,col_name,col1,col2){
col_name <- deparse(substitute(col_name))
col1 <- deparse(substitute(col1))
col...
Most efficient way to increment a Map value in Java
...suggested by Hank Gay
the "Trove" method suggested by jrudolph
the "MutableInt" method suggested by phax.myopenid.com
Method
Here's what I did...
created five classes that were identical except for the differences shown below. Each class had to perform an operation typical of the scenario I pre...
close vs shutdown socket?
...ion (with SHUT_WR, and if you don't care about receiving data after this point, with SHUT_RD as well), and wait until you receive a 0 size data, and then close the socket.
In any case, if any other error occurred (timeout for example), simply close the socket.
Ideal implementations for SHUT_RD and...
Encrypt Password in Configuration Files? [closed]
...ing testing, but it also makes it easier for brute force attackers
int iterationCount = 40000;
// Other values give me java.security.InvalidKeyException: Illegal key size or default parameters
int keyLength = 128;
SecretKeySpec key = createSecretKey(password.toCharArr...
Finding Key associated with max Value in a Java Map
...).getKey();
or
Collections.max(countMap.entrySet(), Comparator.comparingInt(Map.Entry::getValue)).getKey();
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What are your favorite extension methods for C#? (codeplex.com/extensionoverflow)
...);
return list.Contains(source);
}
Allows me to replace:
if(reallyLongIntegerVariableName == 1 ||
reallyLongIntegerVariableName == 6 ||
reallyLongIntegerVariableName == 9 ||
reallyLongIntegerVariableName == 11)
{
// do something....
}
and
if(reallyLongStringVariableName == "s...