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Using arrays or std::vectors in C++, what's the performance gap?
... gcc 4.1.0 invoked with g++ -O3 -S on a
// x86_64-suse-linux machine.
#include <vector>
struct S
{
int padding;
std::vector<int> v;
int * p;
std::vector<int>::iterator i;
};
int pointer_index (S & s) { return s.p[3]; }
// movq 32(%rdi), %rax
// movl 12(...
What is the python “with” statement designed for?
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SQL SELECT speed int vs varchar
...ate types. 8 bytes for a 64-bit number 4 bytes per-character in a string, including either a length byte or struct; or another terminator character for incredibly naive implementations...
– MrMesees
May 13 '16 at 4:59
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Why do indexes in XPath start with 1 and not 0?
...SS version 1.0 was released by December of 2000. With the v1.0 update, RSS included support for XML.
During 2002 v2.0 was released in September as RSS (Really Simple Syndication) and began to evolve into a major internet technology. In it’s early history, RSS feeds (and the XML data they containe...
How to move/rename a file using an Ansible task on a remote system
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bash: pip: command not found
...local/bin/pip
You can either edit your ~/.profile and update your PATH to include /Library/Frameworks/Python.framework/Versions/2.6/bin, or you could create a symlink to it in a place that you know is in your path.
If you do: echo $PATH, you should see the paths currently being searched. If /usr/...
How to send file contents as body entity using cURL
...g cURL command line utility to send HTTP POST to a web service. I want to include a file's contents as the body entity of the POST. I have tried using -d </path/to/filename> as well as other variants with type info like --data </path/to/filename> --data-urlencode </path/to/filena...
Xcode 4: create IPA file instead of .xcarchive
...ublic" into "Project".
Now they don't get installed in $(BUILD)/usr/local/include, and I'm able to make an ipa file from the archive!
I hope Apple fixes this horrible usability problem with XCode. It gives absolutely no indication of what's wrong, it just doesn't work. I hate dimmed out controls ...
How to tell which version of a gem a rails app is using
...t mean when you type bundle show and you get a bunch of Gems with versions including "rails 2.3.17) and you type rake gems and you get what looks like a legend (I=Installed, etc) but no gems/versions? Do I have rails version 2 or not? Maybe I have rails version 2 and a more advanced bundler? Is t...
Oracle: how to UPSERT (update or insert into a table?)
...d for the duration of the transaction, preventing destructive interference including dirty reads, lost updates, and destructive DDL operations from concurrent transactions." Souce : link
– yohannc
Oct 28 '14 at 8:45
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