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How to run code when a class is subclassed? [duplicate]
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Classes (by default) are instances of type.
Just as an instance of a class Foo is created by foo = Foo(...),
an instance of type (i.e. a class) is created by myclass = type(name, bases, clsdict).
If you want something special to happ...
How to find elements by class
...wered Feb 18 '11 at 12:04
Klaus Byskov PedersenKlaus Byskov Pedersen
99.3k2424 gold badges174174 silver badges218218 bronze badges
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Environment variables in Mac OS X
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There's no need for duplication. You can set environment variables used by launchd (and child processes, i.e. anything you start from Spotlight) using launchctl setenv.
For example, if you want to mirror your current path in launchd after setting it up in .bashrc or wherever:
PATH=whatever:you:...
What is the garbage collector in Java?
...he Java Virtual Machine which gets rid of objects which are not being used by a Java application anymore. It is a form of automatic memory management.
When a typical Java application is running, it is creating new objects, such as Strings and Files, but after a certain time, those objects are not u...
Java HTTPS client certificate authentication
...file containing
The client's public certificate (in this instance signed by a self-signed CA)
The client's private key
To generate it I used OpenSSL's pkcs12 command, for example;
openssl pkcs12 -export -in client.crt -inkey client.key -out client.p12 -name "Whatever"
Tip: make sure you get t...
Rails server says port already used, how to kill that process?
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You can also find the PID by navigating through your rails directory to the following file tmp/pids/server.pid
– tandy
Feb 15 '14 at 19:29
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Multiple commands in gdb separated by some sort of delimiter ';'?
...en printed a backtrace, but it doesn't.
You can accomplish the same thing by calling into the Python interpreter.
python import gdb ; print(gdb.execute("s")) ; print(gdb.execute("bt"))
It's possible to wrap this up into a dedicated command, here called "cmds", backed by a python definition.
Here...
What's the _ underscore representative of in Swift References?
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Swift gives the first parameter name in a method a local parameter name by default, and gives the second and subsequent parameter names both local and external parameter names by default.
On the other hand, functions by default don't have external parameter names.
For example, we have this foo...
Why do we copy then move?
...re I answer your questions, one thing you seem to be getting wrong: taking by value in C++11 does not always mean copying. If an rvalue is passed, that will be moved (provided a viable move constructor exists) rather than being copied. And std::string does have a move constructor.
Unlike in C++03, ...
Brew update failed: untracked working tree files would be overwritten by merge
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you might want to do also git add . followed by git stash :P
– mkk
Feb 28 '14 at 16:30
W...