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What is a semaphore?
...ey will be sufficient to protect that resource and prevent multiple people from using it simultaneously.
If there are multiple bathrooms, one might be tempted to key them alike and make multiple keys - this is similar to a semaphore being mis-used. Once you have a key you don't actually know which ...
How do you round a floating point number in Perl?
...ternally it
uses the Math::Complex module and some functions can break out from the
real axis into the complex plane, for example the inverse sine of 2.
Rounding in financial applications can have serious implications, and
the rounding method used should be specified precisely. In these
cases, it ...
Can I make fast forwarding be off by default in git?
...ngs override global) run this:
git config --global --add merge.ff false
From the documentation:
merge.ff
By default, git does not create an extra merge commit when merging a commit that is a descendant of the current commit. Instead, the tip of the current branch is fast-forwarded. When set...
Convert hex string to int in Python
...g to an int, pass the string to int along with the base you are converting from.
Both strings will suffice for conversion in this way:
>>> string_1 = "0xffff"
>>> string_2 = "ffff"
>>> int(string_1, 16)
65535
>>> int(string_2, 16)
65535
Letting int infer
If you p...
Get full path without filename from path that includes filename
...re passing to it does contain a file name; it simply removes the final bit from the path, whether it is a file name or directory name (it actually has no idea which).
You could validate first by testing File.Exists() and/or Directory.Exists() on your path first to see if you need to call Path.GetDi...
git rebase, keeping track of 'local' and 'remote'
... resolving conflicts. I sometimes have the impression that they swap sides from one commit to the next.
4 Answers
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How does Bluebird's util.toFastProperties function make an object's properties “fast”?
...cts in fast mode.
This hack is intended to force the object into fast mode from dictionary mode.
Bluebird's Petka himself talks about it here.
These slides by Vyacheslav Egorov also mentions it.
This question and its accepted answer are also related.
This slightly outdated article is still a fairly...
Fastest way to iterate over all the chars in a String
...d this first: http://www.javaspecialists.eu/archive/Issue237.html
Starting from Java 9, the solution as described won't work anymore, because now Java will store strings as byte[] by default.
SECOND UPDATE: As of 2016-10-25, on my AMDx64 8core and source 1.8, there is no difference between using 'ch...
What are namespaces?
... with the name: Controller.php which is in the path:
app/Http/Controllers from the project’s root directory
There is also another controller class named: Controller.php, but this one is in the path:
vendor/laravel/framework/src/Illuminate/Routing from the project’s root directory
You don’t ...
Zoom in on a point (using scale and translate)
... visible origin. Originally the mouse is at a
// distance mouse/scale from the corner, we want the point under
// the mouse to remain in the same place after the zoom, but this
// is at mouse/new_scale away from the corner. Therefore we need to
// shift the origin (coordinates of...