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What is the copy-and-swap idiom?
...s arguably the most nuanced and difficult. How should it be done? What pitfalls need to be avoided?
The copy-and-swap idiom is the solution, and elegantly assists the assignment operator in achieving two things: avoiding code duplication, and providing a strong exception guarantee.
How does it wor...
Print current call stack from a method in Python code
In Python, how can I print the current call stack from within a method (for debugging purposes).
7 Answers
...
How do I style a dropdown with only CSS?
...select {
background-image:none\9;
padding: 5px\9;
}
}
All together:
select {
margin: 50px;
width: 150px;
padding: 5px 35px 5px 5px;
font-size: 16px;
border: 1px solid #CCC;
height: 34px;
-webkit-appearance: none;
-moz-appearance: none;
appearance: none;
b...
What is the max size of localStorage values?
...per origin in Google Chrome(https://plus.google.com/u/0/+FrancoisBeaufort/posts/S5Q9HqDB8bh), Mozilla Firefox, and Opera; 10 MB per storage area in Internet Explorer) and better programmatic interfaces.
And also quoting from a John Resig article [posted January 2007]:
Storage Space
It is ...
Why dict.get(key) instead of dict[key]?
...
It allows you to provide a default value if the key is missing:
dictionary.get("bogus", default_value)
returns default_value (whatever you choose it to be), whereas
dictionary["bogus"]
would raise a KeyError.
If omitted...
Would it be beneficial to begin using instancetype instead of id?
...stancetype that, as far as I can see, replaces id as a return type in -alloc and init .
4 Answers
...
I don't remember my android debug.keystore password
...ed?
For Windows User: C:\Users\username.android\debug.keystore
For Mac OS User: ~/.android/debug.keystore
After you will get SHAH1 by below command using Command Prompt:
keytool -list -v -keystore "C:\Users\username.android\debug.keystore" -alias androiddebugkey -storepass android -keypass a...
How to select all instances of a variable and edit variable name in Sublime
If I select a variable (not just any string) in my code, all other instances of that variable get a stroke (white outline) around them:
...
How to set child process' environment variable in Makefile
...
I have GNU make 3.81, and all: <\n\t>export PROJ_ROOT=$(CURDIR)<\n\t>echo $(PROJ_ROOT)<\n> outputs the correct expansion for the first row, but only echo for the second one. PROJ_ROOT is not set after running make. Spaces around = gi...
How to JSON serialize sets?
...s.
As shown in the json module docs, this conversion can be done automatically by a JSONEncoder and JSONDecoder, but then you would be giving up some other structure you might need (if you convert sets to a list, then you lose the ability to recover regular lists; if you convert sets to a dictionar...