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Is it safe to push_back an element from the same vector?
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It looks like http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-closed.html#526 addressed this problem (or something very similar to it) as a potential defect in the standard:
1) Parameters taken by const reference can be changed during executi...
How to make a variadic macro (variable number of arguments)
...for g++ here, though it is part of C99 so should work for everyone
http://www.delorie.com/gnu/docs/gcc/gcc_44.html
quick example:
#define debug(format, args...) fprintf (stderr, format, args)
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How to get the start time of a long-running Linux process?
...MD STARTED
1 Tue Jun 7 01:29:38 2016 /sbin/init
2 Tue Jun 7 01:29:38 2016 [kthreadd]
3 Tue Jun 7 01:29:38 2016 [ksoftirqd/0]
5 Tue Jun 7 01:29:38 2016 [kworker/0:0H]
7 Tu...
How to detect online/offline event cross-browser?
...o an example of the "listening for AppCache error events" approach:
http://www.html5rocks.com/en/mobile/workingoffthegrid/#toc-appcache
...and an example of the "listening for XMLHttpRequest failures" approach:
http://www.html5rocks.com/en/mobile/workingoffthegrid/#toc-xml-http-request
HTH,
-- Chad
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Do you debug C++ code in Vim? How? [closed]
...recently wrote a blog post that walks through an example session.
https://www.dannyadam.com/blog/2019/05/debugging-in-vim/
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Why should I use Google's CDN for jQuery?
...f using a CDN and if it provides the expected performance benefits.
http://www.root777.com/appdev/does-using-google-libraries-api-cdn-give-you-performance-benefits
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How can I check if a URL exists via PHP?
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Here:
$file = 'http://www.example.com/somefile.jpg';
$file_headers = @get_headers($file);
if(!$file_headers || $file_headers[0] == 'HTTP/1.1 404 Not Found') {
$exists = false;
}
else {
$exists = true;
}
From here and right below the above...
What is the difference between HTTP_HOST and SERVER_NAME in PHP?
... no problem to send a request to your site asking for a HTTP_HOST value of www.stackoverflow.com.
SERVER_NAME comes from the server's VirtualHost definition and is therefore considered more reliable. It can, however, also be manipulated from outside under certain conditions related to how your web ...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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how to draw smooth curve through N points using javascript HTML5 canvas?
...through all the sample points, but it is much more complicated (see http://www.cartogrammar.com/blog/actionscript-curves-update/)
Here is the the drawing code for the approximation method:
// move to the first point
ctx.moveTo(points[0].x, points[0].y);
for (i = 1; i < points.length - 2...