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Is Meyers' implementation of the Singleton pattern thread safe?
Is the following implementation, using lazy initialization, of Singleton (Meyers' Singleton) thread safe?
6 Answers
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Multiple aggregations of the same column using pandas GroupBy.agg()
Is there a pandas built-in way to apply two different aggregating functions f1, f2 to the same column df["returns"] , without having to call agg() multiple times?
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Splitting a string into chunks of a certain size
Suppose I had a string:
36 Answers
36
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How to correctly require a specific commit in Composer so that it would be available for dependent p
...to explicitly require the Gaufrette library at that hash, with a dev flag, in both your library and your application. Something like this should work in the application composer.json:
{
"name": "bar/bar-app",
"repositories": [
{
"type": "vcs",
"url": "ssh://g...
Automatically plot different colored lines
I'm trying to plot several kernel density estimations on the same graph, and I want them to all be different colors. I have a kludged solution using a string 'rgbcmyk' and stepping through it for each separate plot, but I start having duplicates after 7 iterations. Is there an easier/more efficien...
How can I make a UITextField move up when the keyboard is present - on starting to edit?
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You will only need a ScrollView if the contents you have now do not fit in the iPhone screen. (If you are adding the ScrollView as the superview of the components just to make the TextField scroll up when keyboard comes up, then it's not needed.)
The standard way to prevent the TextFields from be...
When do I need to use AtomicBoolean in Java?
... multiple threads need to check and change the boolean. For example:
if (!initialized) {
initialize();
initialized = true;
}
This is not thread-safe. You can fix it by using AtomicBoolean:
if (atomicInitialized.compareAndSet(false, true)) {
initialize();
}
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C# int to byte[]
I need to convert an int to a byte[] one way of doing it is to use BitConverter.GetBytes() . But im unsure if that matches the following specification:
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Override configured user for a single git commit
I am trying to commit to a project on github.com from my work laptop, which is already configured for the company git server. Is there a way to commit specifying different author credentials, possible using a different configuration file or orther command line switches?
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How to find the size of an array in postgresql
Is there any way to find a size of an array?
4 Answers
4
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