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Is Meyers' implementation of the Singleton pattern thread safe?
...destruction. Does the standard prevent the object from being destructed on one thread while (or before) another thread tries to access it at program termination?
– stewbasic
Jul 10 '17 at 0:50
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Regex: Specify “space or start of string” and “space or end of string”
...
this is the only one that works for me. thank you @gordy
– robsonrosa
Jun 13 '14 at 18:47
2
...
COUNT DISTINCT with CONDITIONS
...from
your_table_name;
The first count(distinct...) is easy.
The second one, looks somewhat complex, is actually the same as the first one, except that you use case...when clause. In the case...when clause, you filter only positive values. Zeros or negative values would be evaluated as null and w...
Python serialization - Why pickle?
...er python script.
As for where the pickled information is stored, usually one would do:
with open('filename', 'wb') as f:
var = {1 : 'a' , 2 : 'b'}
pickle.dump(var, f)
That would store the pickled version of our var dict in the 'filename' file. Then, in another script, you could load fro...
Duplicate AssemblyVersion Attribute
...cess does that but I am curious that why it doesn't overwrite the existing one. Is it badly implemented or is it a limitation?
– Aamir
Apr 25 '12 at 9:18
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Does Python optimize tail recursion?
... +1 For being the correct answer but this seems like an incredibly bone-headed design decision. The reasons given seem to boil down to "it's hard to do given how python is interpreted and I don't like it anyway so there!"
– Basic
Sep 4 '14 at 18:36
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How can I format patch with what I stash away
.... However, since patch files are plain text files themselves, usually what one would do is edit the patch in a text editor to clip out the relevant parts to apply with patch. Alternately, if you're applying the patch into another Git repository, you could apply it all and then selectively git checko...
Android error: Failed to install *.apk on device *: timeout
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Connecting phone to the back of the computer insead of front like EDIT2 suggested solved the problem for me. +1 :)
– Maciek
Feb 3 '14 at 21:44
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Python try-else
...if execution falls off the bottom of the try - if there was no exception. Honestly, I've never found a need.
However, Handling Exceptions notes:
The use of the else clause is better
than adding additional code to the try
clause because it avoids accidentally
catching an exception that was...
No ConcurrentList in .Net 4.0?
...hwhile was a thread-safe, limited subset of IList<T>: in particular, one that would allow an Add and provide random read-only access by index (but no Insert, RemoveAt, etc., and also no random write access).
This was the goal of my ConcurrentList<T> implementation. But when I tested its...