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Difference in make_shared and normal shared_ptr in C++
Many google and stackoverflow posts are there on this, but I am not able to understand why make_shared is more efficient than directly using shared_ptr .
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Why does “while(true)” without “Thread.sleep” cause 100% CPU usage on Linux but not on Windows?
...s say you have 4 cores:
With IRIX mode on, 1 fully utilized core is 100% and 4 cores are 400%.
With IRIX mode off, 1 fully utilized core is 25% and 4 cores are 100%.
This means that by default, top on Linux will show an infinite loop as ~100% and Windows will show it as ~25%, and it means exac...
Backporting Python 3 open(encoding=“utf-8”) to Python 2
... an encoding parameter in Python 2:
If you only need to support Python 2.6 and 2.7 you can use io.open instead of open. io is the new io subsystem for Python 3, and it exists in Python 2,6 ans 2.7 as well. Please be aware that in Python 2.6 (as well as 3.0) it's implemented purely in python and very...
Setting background-image using jQuery CSS property
I have an image URL in a imageUrl variable and I am trying to set it as CSS style, using jQuery:
11 Answers
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What does the tilde (~) mean in my composer.json file?
...o put it is that the ~ allows the last digit to go up. e.g. ~2.2 means 2.2 and any 2.x where x is 2 or above. ~2.1.3 on the is also any 2.1.x where x is 3 or above.
– Seldaek
Sep 24 '13 at 11:36
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Undo git mv (rename)
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Non-cheeky answer:
git mv file2 file1
Updates the index for both old and new paths automatically.
Check documentation of git mv
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Saving vim macros
...copy/paste registers so you can paste it as normal with the "xp or "xP commands in normal mode.
To save it you open up .vimrc and paste the contents, then the register will be around the next time you start vim.
The format is something like:
let @q = 'macro contents'
Be careful of quotes, though...
Git and Mercurial - Compare and Contrast
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Disclaimer: I use Git, follow Git development on git mailing list, and even contribute a bit to Git (gitweb mainly). I know Mercurial from documentation and some from discussion on #revctrl IRC channel on FreeNode.
Thanks to all people on on #mercurial IRC channel who provided help about Mer...
How to set the style -webkit-transform dynamically using JavaScript?
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The JavaScript style names are WebkitTransformOrigin and WebkitTransform
element.style.webkitTransform = "rotate(-2deg)";
Check the DOM extension reference for WebKit here.
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PHP substring extraction. Get the string before the first '/' or the whole string
...me/cat1/subcat2/';
$first = strtok($mystring, '/');
echo $first; // home
and
$mystring = 'home';
$first = strtok($mystring, '/');
echo $first; // home
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