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SQLAlchemy: What's the difference between flush() and commit()?
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A Session object is basically an ongoing transaction of changes to a database (update, insert, delete). These operations aren't persisted to the database until they are committed (if your program aborts for some reason in mid-session transaction, any...
__FILE__ macro shows full path
....com/pipermail/cmake/2013-January/053117.html
I'm copying the tip so it's all on this page:
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__FILENAME__='\"$(subst
${CMAKE_SOURCE_DIR}/,,$(abspath $<))\"'")
If you're using GNU make, I see no reason you couldn't extend this to your own makefiles. ...
Push git commits & tags simultaneously
...h . Pushing tags should be a conscious choice since you don't want accidentally push one. That's fine. But is there a way to push both together? (Aside from git push && git push --tags .)
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What's the best UI for entering date of birth? [closed]
...ry fast. For a not so advanced user I suggest using a datepicker. Since usually you also have advanced and non-advanced users I suggest a combination of text input and datepicker.
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Can I make fast forwarding be off by default in git?
I can't really ever think of a time when I would use git merge rather than git rebase and not want to have a commit show up. Is there any way to configure git to have fast forwarding off by default? The fact that there's an --ff option would seem to imply that there's a way, but I can't se...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...AMD documents it and compilers don't expose it.)
(Yes, these instructions all run on the same execution unit).
This dependency doesn't just hold up the 4 popcnts from a single loop iteration. It can carry across loop iterations making it impossible for the processor to parallelize different loop...
What does @@variable mean in Ruby?
...the classes; setting the value in an instance of one changes the value for all other instances of that class and even child classes, where a variable named @shared, with one @, would not be.
[Update]
As Phrogz mentions in the comments, it's a common idiom in Ruby to track class-level data with an ...
What does “atomic” mean in programming?
...eans an operation that appears to be instantaneous from the perspective of all other threads. You don't need to worry about a partly complete operation when the guarantee applies.
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What is the difference between gsub and sub methods for Ruby Strings
...ticed before. I've been using :gsub and it appears that they are essentially the same. Can anyone explain the difference to me? Thanks!
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How does python numpy.where() work?
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How do they achieve internally that you are able to pass something like x > 5 into a method?
The short answer is that they don't.
Any sort of logical operation on a numpy array returns a boolean array. (i.e. __gt__, __lt__, etc all return boolea...