大约有 48,000 项符合查询结果（耗时：0.0304秒） [XML]
What is an existential type?
...X they're saying: You can plug in whatever type you want, I don't need to know anything about the type to do my job, I'll only refer to it opaquely as X.
When someone defines an existential type ∃X they're saying: I'll use whatever type I want here; you wont know anything about the type, so you c...
href=“tel:” and mobile numbers
... Area code for a mobile telephone
1234 5678 - Mobile telephone number
Now, when I want to dial via the international trunk, you need to drop the trunk prefix and replace it with the international dialing prefix
+ - Short hand for the country trunk number
61 - Country code for Au...
Does Swift have documentation generation support?
...d in the Quick Help Inspector ⌥⌘2).
Symbol documentation comments are now based on the same Markdown syntax used by rich playground comments, so a lot of what you can do in playgrounds can now be used directly in source code documentation.
For full details of the syntax, see Markup Formatting ...
Build fat static library (device + simulator) using Xcode and SDK 4+
... files, PLIST files etc from your library!) - see below (scroll to bottom)
now supports iPhone5 (using Apple's workaround to the bugs in lipo). NOTE: the install instructions have changed (I can probably simplify this by changing the script in future, but don't want to risk it now)
"copy headers" se...
How to show the “Are you sure you want to navigate away from this page?” when changes committed?
...
Update (2017)
Modern browsers now consider displaying a custom message to be a security hazard and it has therefore been removed from all of them. Browsers now only display generic messages. Since we no longer have to worry about setting the message, it i...
Visual Studio: How to show Overloads in IntelliSense?
Once code has been written, the only way I know of to view the overloads for a method is to actually edit the method by deleting the Parenthesis () and reopening them.
...
What does Expression.Quote() do that Expression.Constant() can’t already do?
... is a factory for adders that are bound to the outer lambda's parameter.
Now, suppose we wish to represent this as an expression tree that will later be compiled and executed. What should the body of the expression tree be? It depends on whether you want the compiled state to return a delegate or ...
How to get current time and date in Android
...an (but no longer should - see below!) use android.text.format.Time:
Time now = new Time();
now.setToNow();
From the reference linked above:
The Time class is a faster replacement
for the java.util.Calendar and
java.util.GregorianCalendar classes.
An instance of the Time class
represe...
How do you rename a MongoDB database?
...
This is great! I already had a mongodump created. Didnt know you can restore it with a different name. Thanks!
– Dushyant Bangal
Mar 31 '17 at 13:29
5
...
arrow operator (->) in function heading
...ifier ( argument-declarations... ) -> return_type
They are equivalent. Now when they are equivalent, why do you ever want to use the latter? Well, C++11 introduced this cool decltype thing that lets you describe type of an expression. So you might want to derive the return type from the argument...