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Why does Java's hashCode() in String use 31 as a multiplier?
...multiplication overflowed, information would be lost, as multiplication by 2 is equivalent to shifting. The advantage of using a prime is less clear, but it is traditional. A nice property of 31 is that the multiplication can be replaced by a shift and a subtraction for better performance: 31 * i ==...
java.nio.file.Path for a classpath resource
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3,37122 gold badges1919 silver badges1616 bronze badges
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How does lucene index documents?
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There's a fairly good article here: https://web.archive.org/web/20130904073403/http://www.ibm.com/developerworks/library/wa-lucene/
Edit 12/2014: Updated to an archived version due to the original being deleted, probably the best more recent alternative is http://lucene.apache.org/core/3...
How to allocate aligned memory only using the standard library?
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Original answer
{
void *mem = malloc(1024+16);
void *ptr = ((char *)mem+16) & ~ 0x0F;
memset_16aligned(ptr, 0, 1024);
free(mem);
}
Fixed answer
{
void *mem = malloc(1024+15);
void *ptr = ((uintptr_t)mem+15) & ~ (uintptr_t)0x0F;
m...
How to have an automatic timestamp in SQLite?
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215
Just declare a default value for a field:
CREATE TABLE MyTable(
ID INTEGER PRIMARY KEY,
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What is the difference between class and instance methods?
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edited Feb 26 '10 at 17:11
answered Jun 27 '09 at 21:19
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What is a C++ delegate?
...urn (int) d + 1;
}
};
// Use:
Functor f;
int i = f(3.14);
Option 2: lambda expressions (C++11 only)
// Syntax is roughly: [capture](parameter list) -> return type {block}
// Some shortcuts exist
auto func = [](int i) -> double { return 2*i/1.15; };
double d = func(1);
Option 3: ...
Duplicate headers received from server
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236
This ones a little old but was high in the google ranking so I thought I would throw in the an...
What's the difference of $host and $http_host in Nginx
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220
$host is a variable of the Core module.
$host
This variable is equal to line Host in the he...