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Is there a performance difference between a for loop and a for-each loop?
... iterator or index variable
completely. The resulting idiom
applies equally to collections and
arrays:
// The preferred idiom for iterating over collections and arrays
for (Element e : elements) {
doSomething(e);
}
When you see the colon (:), read it as
“in.” Thus, the loop ab...
ElasticSearch: Unassigned Shards, how to fix?
...
By default, Elasticsearch will re-assign shards to nodes dynamically. However, if you've disabled shard allocation (perhaps you did a rolling restart and forgot to re-enable it), you can re-enable shard allocation.
# v0.90.x and earlier
curl -XPUT 'localhost:9200/_settings' -d '{
"in...
Code Golf: Collatz Conjecture
...sp+0x04], 2
jne .usage
mov ebx, [esp+0x08]
push dword [ebx+0x04]
call atoi
add esp, 4
cmp eax, 0
je .usage
mov ebx, eax
push eax
push msg
.loop:
mov [esp+0x04], ebx
call printf
test ebx, 0x01
jz .even
.odd:
lea ebx, [1+ebx*2+ebx]
jmp .loop
.even:
shr ebx, 1
...
What is time_t ultimately a typedef to?
...IX-compliant systems implement the time_t type as a signed
integer (typically 32 or 64 bits wide)
which represents the number of seconds
since the start of the Unix epoch:
midnight UTC of January 1, 1970 (not
counting leap seconds). Some systems
correctly handle negative time values,
w...
What is the reason for performing a double fork when creating a daemon?
...the TTY.
I ran Sander Marechal's python example daemon program from this site on my Ubuntu. Here are the results with my comments.
1. `Parent` = PID: 28084, PGID: 28084, SID: 28046
2. `Fork#1` = PID: 28085, PGID: 28084, SID: 28046
3. `Decouple#1`= PID: 28085, PGID: 28085, SID: 28085
4. `Fo...
What's the difference between the WebConfigurationManager and the ConfigurationManager?
...uld be several web.config files in one applicaion - one in the root of the site and any number in subdirectories. You can pass path to the GetSection() method to get possible overridden config.
If we'd looke at WebConfigurationManager with Reflector then things are clear:
public static object GetS...
Rename multiple files by replacing a particular pattern in the filenames using a shell script [dupli
...ho "$f" | sed s/IMG/VACATION/)"; done
In this example, I am assuming that all your image files contain the string IMG and you want to replace IMG with VACATION.
The shell automatically evaluates *.jpg to all the matching files.
The second argument of mv (the new name of the file) is the output of t...
PHP CURL DELETE request
...
I finally solved this myself. If anyone else is having this problem, here is my solution:
I created a new method:
public function curl_del($path)
{
$url = $this->__url.$path;
$ch = curl_init();
curl_setopt($ch, CU...
How to send a command to all panes in tmux?
I like to call :clear-history on panes with a huge scrollback. However, I want to script a way to send this command to all the panes in the various windows.
...
Locking a file in Python
...terminate in such a way that the lock is left in place and you have to manually delete the lock before the file becomes accessible again. However, that aside, this is still a good solution.
– leetNightshade
Nov 8 '12 at 21:27
...