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Python Process Pool non-daemonic?
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How to get the part of a file after the first line that matches a regular expression?
...ular expression (like grep) to the end of the file ($), and p is the print command which prints the current line.
This will print from the line that follows the line matching TERMINATE till the end of the file:
(from AFTER the matching line to EOF, NOT including the matching line)
sed -e '1,/TERMI...
smart pointers (boost) explained
...tain behavior of the copy constructor of elements of containers which is incompatible with this so-called "moving constructor" behavior of these smart pointers.
C++1x provides native support for transfer-of-ownership by introducing so-called "move constructors" and "move assignment operators". It ...
How can I safely create a nested directory?
...if not os.path.exists(directory):
os.makedirs(directory)
As noted in comments and elsewhere, there's a race condition – if the directory is created between the os.path.exists and the os.makedirs calls, the os.makedirs will fail with an OSError. Unfortunately, blanket-catching OSError and con...
Cosmic Rays: what is the probability they will affect a program?
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From Wikipedia:
Studies by IBM in the 1990s suggest that computers typically experience about one cosmic-ray-induced error per 256 megabytes of RAM per month.[15]
This means a probability of 3.7 × 10-9 per byte per month, or 1.4 × 10-15 per byte per second. If your program runs...
The necessity of hiding the salt for a hash
At work we have two competing theories for salts. The products I work on use something like a user name or phone number to salt the hash. Essentially something that is different for each user but is readily available to us. The other product randomly generates a salt for each user and changes eac...
How do I shuffle an array in Swift?
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community wiki
20 revs, 3 users 81%Nate Cook
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Exotic architectures the standards committees care about
...s, it would be very difficult or impossible to write a standard conforming compiler for it.
7 Answers
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How to [recursively] Zip a directory in PHP?
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Here is a simple function that can compress any file or directory recursively, only needs the zip extension to be loaded.
function Zip($source, $destination)
{
if (!extension_loaded('zip') || !file_exists($source)) {
return false;
}
$zip ...
What is better, adjacency lists or adjacency matrices for graph problems in C++?
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It is slow to iterate over all edges
It is slow to add/delete a node; a complex operation O(n^2)
It is fast to add a new edge O(1)
Adjacency List
Memory usage depends on the number of edges (not number of nodes),
which might save a lot of memory if the adjacency matrix is sparse
Finding the...