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'and' (boolean) vs '&' (bitwise) - Why difference in behavior with lists vs numpy arrays?
...ogically True. This facilitates the common use case where you want to do something if a list is empty and something else if the list is not. Note that this means that the list [False] is logically True:
>>> if [False]:
... print 'True'
...
True
So in Example 1, the first list is non-e...
What does the git index contain EXACTLY?
...ary file (generally kept in .git/index) containing a sorted list of path names, each with permissions and the SHA1 of a blob object; git ls-files can show you the contents of the index:
$ git ls-files --stage
100644 63c918c667fa005ff12ad89437f2fdc80926e21c 0 .gitignore
100644 5529b198e8d14decbe4a...
__FILE__, __LINE__, and __FUNCTION__ usage in C++
...FUNCTION__/__func__). Optimization is a non-factor since it is a compile time macro expansion; it will never effect performance in any way.
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ObservableCollection not noticing when Item in it changes (even with INotifyPropertyChanged)
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The ContentList's Set method will not get called when you change a value inside the collection, instead you should be looking out for the CollectionChanged event firing.
public class CollectionViewModel : ViewModelBase
{
public Obse...
When to use EntityManager.find() vs EntityManager.getReference() with JPA
I have come across a situation (which I think is weird but is possibly quite normal) where I use the EntityManager.getReference(LObj.getClass(), LObj.getId()) to get a database entity and then pass the returned object to be persisted in another table.
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How to add a local repo and treat it as a remote repo
I'm trying to make a local repo act as a remote with the name bak for another local repo on my PC, using the following:
4...
Does using “new” on a struct allocate it on the heap or stack?
When you create an instance of a class with the new operator, memory gets allocated on the heap. When you create an instance of a struct with the new operator where does the memory get allocated, on the heap or on the stack ?
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Do I cast the result of malloc?
In this question , someone suggested in a comment that I should not cast the result of malloc , i.e.
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Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”
...ckage, such as the server itself. This way you eliminiate potential environment-specific problems. Packageless servlets work only in specific Tomcat+JDK combinations and this should never be relied upon.
In case of a "plain" IDE project, the class needs to be placed in its package structure inside...
How does a public key verify a signature?
...keys work. I understand that a sender may add a digital signature to a document using his/her private key to essentially obtain a hash of the document, but what I do not understand is how the public key can be used to verify that signature.
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