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Creating an abstract class in Objective-C
...protocol. For all the methods you want "abstract" implement them in the .m file, but not the .h file.
Have your child class inherit from the base class AND implement the protocol.
This way the compiler will give you a warning for any method in the protocol that isn't implemented by your child clas...
What is the pythonic way to detect the last element in a 'for' loop?
...m()
This will work for any iterable, even for those that have no len():
file = open('/path/to/file')
for line in file:
process_line(line)
# No way of telling if this is the last line!
Apart from that, I don't think there is a generally superior solution as it depends on what you are tr...
Can two applications listen to the same port?
...
@Samuel: opening a port (in server mode) means getting a file descriptor, and when the system gets a SYN packet to that port number, responds with SYN+ACK and generates an event on the associated file descriptor. the application responds to that event with an accept() call, which ...
How to clone all repos at once from GitHub?
...e
Here is the useful shell function which can be added to user's startup files (using curl + jq):
# Usage: gh-clone-user (user)
gh-clone-user() {
curl -sL "https://api.github.com/users/$1/repos?per_page=1000" | jq -r '.[]|.clone_url' | xargs -L1 git clone
}
Private repositories
If you need...
How to add dividers and spaces between items in RecyclerView?
...
Might I direct your attention to this particular file on Github by Alex Fu:
https://gist.github.com/alexfu/0f464fc3742f134ccd1e
It's the DividerItemDecoration.java example file "pulled straight from the support demos".(https://plus.google.com/103498612790395592106/posts/VV...
SecItemAdd and SecItemCopyMatching returns error code -34018 (errSecMissingEntitlement)
...t been talked to by Xcode) that’s running iOS 9.3 or later,
please do file a bug report about it. Try to include the device
system log in your bug report (I realise that can be tricky when
dealing with customer devices; one option is to ask the customer to
install Apple Configurator, whic...
Backwards migration with Django South
... you want to roll back.
Your app should have a migrations directory, with files in it named like
0000_initial.py
0001_added_some_fields.py
0002_added_some_more_fields.py
0003_deleted_some_stuff.py
Normally, when you run ./manage.py migrate your_app, South runs all new migrations, in order. (It l...
Git diff -w ignore whitespace only at start & end of lines
...r default behavior, the following line adds that intent to your .gitconfig file, so it will always ignore the space at line ends:
git config --global core.whitespace trailing-space
In my case, I found this question because I was interested in ignoring "carriage return whitespace differences", so I...
Tricks to manage the available memory in an R session
...oad.R and do.R, where load.R may take quite some time to load in data from files or a database, and does any bare minimum pre-processing/merging of that data. The last line of load.R is something to save the workspace state. Then do.R is my scratchpad whereby I build out my analysis functions. I fr...
Bidirectional 1 to 1 Dictionary in C#
...d RemoveBySecond would be trivial - as would implementing extra interfaces etc.
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