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How to perform Callbacks in Objective-C
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Normally, callbacks in objective C are done with delegates. Here's an example of a custom delegate implementation;
Header File:
@interface MyClass : NSObject {
id delegate;
}
- (void)setDelegate:(id)delegate;
- (void)doSomething;
@end
@interface NSObject(MyDele...
Is there a faster/shorter way to initialize variables in a Rust struct?
... each field in the struct in the declaration of the fields. Alternatively, it effectively takes one additional statement for each field to assign a value to the fields. All I want to be able to do is to assign default values when the struct is instantiated.
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How do I prompt for Yes/No/Cancel input in a Linux shell script?
...er input at a shell prompt is the read command. The best way to illustrate its use is a simple demonstration:
while true; do
read -p "Do you wish to install this program?" yn
case $yn in
[Yy]* ) make install; break;;
[Nn]* ) exit;;
* ) echo "Please answer yes or no."...
Correct way to define Python source code encoding
...put pretty much anything before the "coding" part, but stick to "coding" (with no prefix) if you want to be 100% python-docs-recommendation-compatible.
More specifically, you need to use whatever is recognized by Python and the specific editing software you use (if it needs/accepts anything at all)...
Returning value that was passed into a method
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You can use a lambda with an input parameter, like so:
.Returns((string myval) => { return myval; });
Or slightly more readable:
.Returns<string>(x => x);
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Evil Mode best practice? [closed]
I've been using Vim as my primary editor for years and tried Emacs several times during that time. Then I discovered Evil and decided that it meets my demand for speedy movement well enough that I can finally move on to Emacs.
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Java Hashmap: How to get key from value?
...ibrary instead of the standard Java Collections API, you can achieve this with ease.
The BidiMap interface in the Collections library is a bi-directional map, allowing you to map a key to a value (like normal maps), and also to map a value to a key, thus allowing you to perform lookups in both dire...
How to list only top level directories in Python?
...de some folder.
This means I don't want filenames listed, nor do I want additional sub-folders.
18 Answers
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How to test valid UUID/GUID?
...follow
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edited Sep 23 '19 at 10:59
Soroush Chehresa
2,95911 gold badge88 silver badges2222 bronze badges
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Django using get_user_model vs settings.AUTH_USER_MODEL
...cannot guarantee that the User model is already loaded into the app cache. It might work in your specific setup, but it is a hit-and-miss scenario. If you change some settings (e.g. the order of INSTALLED_APPS) it might very well break the import and you will have to spend additional time debugging....