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What are the Dangers of Method Swizzling in Objective-C?
...ing is a dangerous practice. Even the name swizzling suggests that it is a bit of a cheat.
8 Answers
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Backup/Restore a dockerized PostgreSQL database
...ualenv that the docker container and project were in. This eluded me for a bit before figuring it out- as I was receiving the following docker error.
read unix @->/var/run/docker.sock: read: connection reset by peer
This can be caused by the file /var/lib/docker/network/files/local-kv.db .I d...
How to convert R Markdown to PDF?
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Updated Answer (10 Feb 2013)
rmarkdown package:
There is now an rmarkdown package available on github that interfaces with Pandoc.
It includes a render function. The documentation makes it pretty clear how to convert rmarkdown to pdf amon...
Comma in C/C++ macro
...e
FOO(SINGLE_ARG(std::map<int, int>), map_var);
Otherwise, it's a bit more tedious:
#define SINGLE_ARG2(A,B) A,B
#define SINGLE_ARG3(A,B,C) A,B,C
// as many as you'll need
FOO(SINGLE_ARG2(std::map<int, int>), map_var);
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Getting the last argument passed to a shell script
...
This is a bit of a hack:
for last; do true; done
echo $last
This one is also pretty portable (again, should work with bash, ksh and sh) and it doesn't shift the arguments, which could be nice.
It uses the fact that for implicitly l...
How does Python's super() work with multiple inheritance?
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I wanted to elaborate the answer by lifeless a bit because when I started reading about how to use super() in a multiple inheritance hierarchy in Python, I did't get it immediately.
What you need to understand is that super(MyClass, self).__init__() provides the next __i...
How to check iOS version?
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You need to be a bit careful here because [@"10.0" compare:@"10" options:NSNumericSearch] returns NSOrderedDescending, which might well not be intended at all. (I might expect NSOrderedSame.) This is at least a theoretical possibility.
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What's the pythonic way to use getters and setters?
...: It isn't, though. "Strip the markup, and you still get at least a little bit of useful information."
– Jean-François Corbett
Mar 16 '17 at 15:11
7
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StringBuilder vs String concatenation in toString() in Java
... arguments gets large. It also doesn't work for times when you need to add bits at different times.
– Alex Feinman
Oct 7 '09 at 16:25
78
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Instance attribute attribute_name defined outside __init__
...ods though. In such case, you can simply assign attributes to None (with a bit of documentation) in the __init__ then call the sub-initialization methods.
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