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Is there any advantage of using map over unordered_map in case of trivial keys?
...rdered_map vs. map (or vector vs list) , the default process heap (talking Windows here) is serialized. Allocating (small) blocks in large quantities in a multithreaded application is very expensive.
– ROAR
Feb 4 '10 at 3:06
...
Regex Pattern to Match, Excluding when… / Except between
...I'm not always a fan of visualizations, but this one does a good job of showing how simple the method is. Each "line" corresponds to a potential match, but only the bottom line is captured into Group 1.
Debuggex Demo
Perl/PCRE Variation
In contrast to the general solution above, there exists a...
What is the difference between NTFS Junction Points and Symbolic Links?
...f you're certain that that's the case in a specific environment (maybe for Windows XP or because of security settings) I'll make note of that but in my experience and from documentation (and I just confirmed on Windows 10) a junction can always target a non-existent path, even upon creation... there...
Why would one omit the close tag?
...; at the end of the file. The header problem seems irrelevant in the following context (and this is the only good argument so far):
...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
...thus in temp tables or sorted results.
I have helped MySQL users who unknowingly created 1.5GB temp tables frequently and filled up their disk space. They had lots of VARCHAR(255) columns that in practice stored very short strings.
It's best to define the column based on the type of data that you...
How can you program if you're blind?
...everal programming internships so my answer will be based off these. I use windows xp as my operating system and Jaws to read what appears on the screen to me in synthetic speech. For java programming I use eclipse, since it’s a fully featured IDE that is accessible.
In my experience as a genera...
How to get client's IP address using JavaScript?
...com
ip=54.193.27.106
ts=1575967108.245
visit_scheme=https
uag=Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36 Hypothesis-Via
colo=SJC
http=http/1.1
loc=US
tls=TLSv1.3
sni=plaintext
warp=off
Limitations:
Returns plain text
DB-IP
...
Is it better to use C void arguments “void foo(void)” or not “void foo()”? [duplicate]
...mitted identifier list and a parameter type list, the parameter type list "wins". The type of the function at the end contains a prototype:
void f();
void f(int a) {
printf("%d", a);
}
// f has now a prototype.
That is because both declarations do not say anything contradictory. The second,...
vs
...gured to serve files in ISO-8859-1 by default, so you need to add the following line to your .htaccess file:
AddDefaultCharset UTF-8
This will configure Apache to serve your files declaring UTF-8 encoding in the Content-Type response header, but your files must be saved in UTF-8 (without BOM) to ...
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...
OpenCV is pretty much the same for all platforms (Win/Linux/Mac/iPhone/...). The difference is that some don't supported the GPU module of OpenCV. Have you built OpenCV for iOS already? Were you able to test it? I think these are the questions you need to answer before tryin...