大约有 40,000 项符合查询结果（耗时：0.0588秒） [XML]
What is “rvalue reference for *this”?
...ly interested in that).
Which function is going to be called is determined by a process called overload resolution. This process is fairly complicated, so we'll only touch the bit that is important to us.
First, it's important to see how overload resolution for member functions works:
§13.3.1 [over...
How to reset Django admin password?
... shell using the command "python manage.py shell".
Import the User Model by typing the following command
"from django.contrib.auth.models import User"
Get all the users by typing the following command
"users = User.objects.all()"
Print a list of the users
For Python 2 users use the command "prin...
String concatenation: concat() vs “+” operator
...n more recent HotSpot. javac still produces exactly the same code, but the bytecode compiler cheats. Simple testing entirely fails because the entire body of code is thrown away. Summing System.identityHashCode (not String.hashCode) shows the StringBuffer code has a slight advantage. Subject to chan...
Returning from a finally block in Java
...
I had a REALLY hard time to track down a bug years ago that was caused by this. The code was something like:
Object problemMethod() {
Object rtn = null;
try {
rtn = somethingThatThrewAnException();
}
finally {
doSomeCleanup();
return rtn;
}
}
What h...
How is OAuth 2 different from OAuth 1?
...12/… A significant difference in the two are security - as foreshadowed by the lack of cryptography in 2.0.
– kdazzle
Jun 6 '13 at 20:15
...
Ternary operator (?:) in Bash
...to test for the empty string specifically. I like to use the syntaxes used by zsh ('PARAMETER EXPANSION' in the zshexpn manpage) but I don't know much about their portability.
– John P
Feb 23 '18 at 3:31
...
Measuring function execution time in R
...ortant to know is that system.time() has an argument gcFirst which is TRUE by default. This on the one hand makes the measuring a bit more reproducible but can generate a significant overhead of total run time (which is not measured, off course).
– jakob-r
Oct ...
Remove a marker from a GoogleMap
...ddMarker (MarkerOptions options)
So when you add a marker to a GoogleMap by specifying the options for the marker, you should save the Marker object that is returned (instead of the MarkerOptions object that you used to create it). This object allows you to change the marker state later on. When...
How do I delete an exported environment variable?
... pattern. Plus2, echo $VARIABLE makes possible to complete variable's name by hitting <Tab> (if it exists, that also may be a hint to what you wanna do).
– Rodrigo Gurgel
Jan 12 '16 at 17:44
...
Intercept page exit event
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...