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Is there a performance difference between i++ and ++i in C++?
...ent translation units. Compiler with g++ 4.5.
Ignore the style issues for now
// a.cc
#include <ctime>
#include <array>
class Something {
public:
Something& operator++();
Something operator++(int);
private:
std::array<int,PACKET_SIZE> data;
};
int main () {
S...
How do I check if a Sql server string is null or empty
...ffer_Text == '')
temp := null;
else
temp := listing.Offer_Text; // may now be null or non-null, but not ''
// b) ISNULL:
if (temp is null)
result := true;
else
result := false;
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impr...
MongoDB or CouchDB - fit for production? [closed]
...ction.
businessinsider has been using mongo in production for over a year now. They are using it for everything from users and blog posts, to every image on the site.
shopwiki is using it for a few things including real time analytics and a caching layer. They are doing over 1000 writes per secon...
browser sessionStorage. share between tabs?
...sionStorage', JSON.stringify(sessionStorage));
// the other tab should now have it, so we're done with it.
localStorage.removeItem('sessionStorage'); // <- could do short timeout as well.
} else if (event.key == 'sessionStorage' && !sessionStorage.length) {
// another tab se...
Angular JS: What is the need of the directive’s link function when we already had directive’s contro
... link and controller functions and reading quite a lot about them, I think now I have the answer.
First lets understand,
How do angular directives work in a nutshell:
We begin with a template (as a string or loaded to a string)
var templateString = '<div my-directive>{{5 + 10}}</div>...
How do I detect when someone shakes an iPhone?
..., just that it was waved vigorously about for a split second. Does anyone know how to detect this?
16 Answers
...
Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...式如下：
systime()
实例：
$ awk '{ now = systime(); print now }'
strftime函数使用C库中的strftime函数格式化时间。格式如下：
systime( [format specification][,timestamp] )
Table 3. 日期和时间格式说明符
...
Pointer to class data member “::*”
...
Here's a real-world example I am working on right now, from signal processing / control systems:
Suppose you have some structure that represents the data you are collecting:
struct Sample {
time_t time;
double value1;
double value2;
double value3;
};
Now ...
What is the difference between _tmain() and main() in C++?
...s are passed to the main function, which interprets them as char strings.
Now, in UTF-16, the character set used by Windows when Unicode is enabled, all the ASCII characters are represented as the pair of bytes \0 followed by the ASCII value.
And since the x86 CPU is little-endian, the order of th...
Can Selenium Webdriver open browser windows silently in background?
...
"--no-startup-window" is now deprecated
– Corey Goldberg
Nov 10 '17 at 4:16
5
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