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Is there any difference between the `:key => “value”` and `key: “value”` hash notations?
...array }
h = { 'a.b': 'c' } # but this is okay in Ruby2.2+
h[s:] = 42
You can also use anything as a key with => so you can do this:
h = { C.new => 11 }
h = { 23 => 'pancakes house?' }
but you can't do this:
h = { C.new: 11 }
h = { 23: 'pancakes house?' }
The JavaScript style (key: v...
Can you list the keyword arguments a function receives?
...c)
(['a', 'b', 'c'], 'args', 'kwargs', (42,))
If you want to know if its callable with a particular set of args, you need the args without a default already specified. These can be got by:
def getRequiredArgs(func):
args, varargs, varkw, defaults = inspect.getargspec(func)
if defaults:
...
Is 0 a decimal literal or an octal literal?
...otherwise every octal literal could be interpreted as a decimal literal. I can see the compile error, now: ERROR: 0 is ambiguous, could be octal zero or could be decimal zero. Consider using (1 - 1) to disambiguate.
– CB Bailey
Aug 1 '11 at 9:25
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How to read the Stock CPU Usage data
...nderneath it shows the CPU time spent in compositing the screen. Note: You cannot turn this feature off once it is on, without restarting the emulator. developer.android.com/tools/debugging/debugging-devtools.html
– Rolf ツ
Sep 25 '12 at 12:39
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Override compile flags for single files
...r setting wins. To see the full command and check that this is indeed the case, you can do
make VERBOSE=1
As an aside, one of the maintainers of the GNU C++ Standard Library presents a pretty negative opinion on -Weffc++ in this answer.
Another point is that you're misusing add_definitions in t...
What's in an Eclipse .classpath/.project file?
...ently had an issue with an Eclipse project for one of our team members. Tomcat was not deploying JARs of the application.
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What is the difference between JavaConverters and JavaConversions in Scala?
In scala.collection , there are two very similar objects JavaConversions and JavaConverters .
4 Answers
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C# Thread safe fast(est) counter
...ment locks the bus to prevent another CPU from accessing the bus while the calling CPU does its operation. Now, take a look at the C# lock() statement's IL. Here you will see calls to Monitor in order to begin or end a section.
In other words, .Net lock() statement is doing a lot more than the .N...
When do I use fabs and when is it sufficient to use std::abs?
... it's always sufficient to use std::abs; it's overloaded for all the numerical types.
In C, abs only works on integers, and you need fabs for floating point values. These are available in C++ (along with all of the C library), but there's no need to use them.
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Execute AsyncTask several times
...m AsyncTask and a parameter which is an instance of that AsyncTask. When I call mInstanceOfAT.execute("") everything is fine.
But the app crash when I press an update button which calls again the AsyncTask(In case the network job didnt work). Cause then appears an Exception which says
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