大约有 48,000 项符合查询结果（耗时：0.0841秒） [XML]
Safe (bounds-checked) array lookup in Swift, through optional bindings?
... return indices.contains(index) ? self[index] : nil
}
}
Swift 3.0 and 3.1
extension Collection where Indices.Iterator.Element == Index {
/// Returns the element at the specified index if it is within bounds, otherwise nil.
subscript (safe index: Index) -> Generator.Element? {...
Why is an int in OCaml only 31 bits?
...pointer dererefences plus one object construction. And you take up almost 20 Byte.
However, the trick is that with so-called immutable value types like integers, you usually don't need all the metadata in the object header: you can just leave all that stuff out, and simply synthesize it (which is V...
Difference between Mock / Stub / Spy in Spock test framework
...ck is a dummy class replacing a real one, returning something like null or 0 for each method call. You use a mock if you need a dummy instance of a complex class which would otherwise use external resources like network connections, files or databases or maybe use dozens of other objects. The advant...
Complete Working Sample of the Gmail Three-Fragment Animation Scenario?
...
+500
Uploaded my proposal at github
(Is working with all android versions though view hardware acceleration is strongly recommended for t...
Are Roslyn SyntaxNodes reused?
...
UPDATE: This question was the subject of my blog on June 8th, 2012. Thanks for the great question!
Great question. We debated the issues you raise for a long, long time.
We would like to have a data structure that has the following characteristics:
Immutable.
The form of a tree.
Ch...
What's the difference(s) between .ToList(), .AsEnumerable(), AsQueryable()?
...ypeProperties<T>(T obj)
{
Console.WriteLine("Compile-time type: {0}", typeof(T).Name);
Console.WriteLine("Actual type: {0}", obj.GetType().Name);
}
Let's try an arbitrary linq-to-sql Table<T>, which implements IQueryable:
ReportTypeProperties(context.Observations);
ReportTypePro...
HTTP 401 - what's an appropriate WWW-Authenticate header value?
... gut feel if you are using forms based authentication is to stay with the 200 + relogin page but add a custom header that the browser will ignore but your AJAX can identify.
For a really good User + AJAX experience, get the script to hang on to the AJAX request that found the session expired, fire ...
What is the logic behind the “using” keyword in C++?
...
120
In C++11, the using keyword when used for type alias is identical to typedef.
7.1.3.2
A typedef...
How to check which locks are held on a table
...g on the version of SQL Server in question.
In your case, for SQL Server 2005, sp_lock is still available, but deprecated, so it's now recommended to use the sys.dm_tran_locks view for this kind of thing. You can find an example of how to "roll your own" sp_lock function here.
...