大约有 40,000 项符合查询结果（耗时：0.0841秒） [XML]
What makes Lisp macros so special?
...What this says is: Evaluate expr1, and, should it be true, evaluate expr2, etc.
Now try to make this && into a function... thats right, you can't. Calling something like:
and(expr1, expr2, expr3)
Will evaluate all three exprs before yielding an answer regardless of whether expr1 was fals...
Is using Random and OrderBy a good shuffle algorithm?
...ents[swapIndex] = tmp;
}
// Lazily yield (avoiding aliasing issues etc)
foreach (T element in elements)
{
yield return element;
}
}
EDIT: Comments on performance below reminded me that we can actually return the elements as we shuffle them:
public static IEnumerable<...
Java executors: how to be notified, without blocking, when a task completes?
...your program) until it notices an update (boolean flag, new item in queue, etc.) made by the true callback as described in this answer. It can then perform some additional work.
– erickson
Oct 24 '16 at 14:53
...
Add string in a certain position in Python
...CB6
However if you like something like a function do as this:
def insert_dash(string, index):
return string[:index] + '-' + string[index:]
print insert_dash("355879ACB6", 5)
share
|
improve...
Spinlock versus Semaphore
...data, and finally modifies a shared reference (append data to a container, etc.) before releasing the lock. Instead, one would acquire the lock only for the purpose of accessing the shared resource.
Since this means that there is considerably more work outside the critical section than inside it, na...
NoSQL - MongoDB vs CouchDB [closed]
...~2.5Gb
Text search integrated
GridFS to store big data + metadata (not actually an FS)
Data center aware
Best used: If you need dynamic queries. If you prefer to define indexes, not map/reduce functions. If you need good performance on a big DB. If you wanted CouchDB, but your data changes too muc...
ReSharper Abbreviations List: Where can I modify it?
...e 6.x way of doing it?)
http://www.jetbrains.com/resharper/webhelp50/Coding_Assistance__Naming_Style.html#dynaProc3
share
|
improve this answer
|
follow
|
...
Can I hide the HTML5 number input’s spin box?
... still displayed in Opera and they'll start being displayed in Firefox, IE etc. when they implement this input type.
– mgol
Feb 5 '13 at 14:44
...
SQL Server equivalent to MySQL enum data type?
...ION ActionState_Unassigned()
RETURNS tinyint
AS
BEGIN
RETURN 1
END
-- etc...
Where performance matters, still use the hard values.
share
|
improve this answer
|
follow...
Setting default permissions for newly created files and sub-directories under a directory in Linux?
... with umask 002 or 007 or something of that nature" - that's a bit of a stretch.... How do you make Postfix, Dovecot, Clam and Spam Assassin all do this?
– jww
Apr 3 '14 at 0:18
2
...