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What happens if you call erase() on a map element while iterating from begin to end?
...C++03
Erasing elements in a map does not invalidate any iterators.
(apart from iterators on the element that was deleted)
Actually inserting or deleting does not invalidate any of the iterators:
Also see this answer:
Mark Ransom Technique
But you do need to update your code:
In your code you i...
Fastest way to get the first object from a queryset in django?
Often I find myself wanting to get the first object from a queryset in Django, or return None if there aren't any. There are lots of ways to do this which all work. But I'm wondering which is the most performant.
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How to fix Git error: object file is empty?
....com> 1347358589 -0400 commit: fixed up to page 28
Step 7: Note that from Step 6 we learned that the HEAD is currently pointing to the very last commit. So let's try to just look at the parent commit:
nathanvan@nathanvan-N61Jq:~/workspace/mcmc-chapter$ git show 9f0abf890b113a287e10d56b66dbab6...
private[this] vs private
In Scala I see such feature as object-private variable. From my not very rich Java background I learnt to close everything (make it private) and open (provide accessors) if necessary. Scala introduces even more strict access modifier. Should I always use it by default? Or should I use it only in som...
Convert sqlalchemy row object to python dict
...em. if you want just column data (for example, to take a list of instances from a query and drop them in a pandas dataframe) then {col.name: getattr(self, col.name) for col in self.__table__.columns} as answered by Anurag Uniyal (with important corrections from comments to that answer) seems both mo...
How to cherry pick only changes for only one file, not the whole commit
... patchfile
git apply patchfile
EDIT:
Since you need to take the changes from a commit, create the patch like this:
git show sha1 -- filename > patchfile
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What is the purpose of mock objects?
...e to provide). The mock will indicate whether what really happens differs from what is supposed to happen. A custom mock object could be created from scratch for each test case to execute the expected behavior for that test case, but a mocking framework strives to allow such a behavior specificati...
How can I scan barcodes on iOS?
...ation for the iPhone. It can decode QR Codes. The source code is available from the zxing project; specifically, you want to take a look at the iPhone client and the partial C++ port of the core library. The port is a little old, from circa the 0.9 release of the Java code, but should still work rea...
How to get String Array from arrays.xml file
I am just trying to display a list from an array that I have in my arrays.xml . When I try to run it in the emulator, I get a force close message.
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What does the unary plus operator do?
...r than the operator itself. For example, it can be used to force widening from smaller integral types to int, or ensure that an expression's result is treated as an rvalue and therefore not compatible with a non-const reference parameter. I submit, however, that these uses are better suited to cod...