大约有 47,000 项符合查询结果（耗时：0.0686秒） [XML]
Why are Objective-C delegates usually given the property assign instead of retain?
...
175
The reason that you avoid retaining delegates is that you need to avoid a retain cycle:
A cre...
GitHub Windows client behind proxy
...
131
Add these entries to your '.gitconfig' file in your user directory (go to %USERPROFILE%):
[ht...
Lock, mutex, semaphore… what's the difference?
...so have read/write locks that allows either unlimited number of readers or 1 writer at any given time.
share
|
improve this answer
|
follow
|
...
What are the best Haskell libraries to operationalize a program? [closed]
... I've done in the past.
$ ./A +RTS -s
64,952 bytes allocated in the heap
1 MB total memory in use
%GC time 0.0% (6.1% elapsed)
Productivity 100.0% of total user, 0.0% of total elapsed
You can get this in machine-readable format too:
$ ./A +RTS -t --machine-readable
[("bytes allocated...
How much overhead does SSL impose?
...
179
Order of magnitude: zero.
In other words, you won't see your throughput cut in half, or anyth...
Why does Clojure have “keywords” in addition to “symbols”?
...
139
Here's the Clojure documentation for Keywords and Symbols.
Keywords are symbolic identifie...
Why use argparse rather than optparse?
...
|
edited Sep 10 '17 at 14:34
Cœur
29.8k1515 gold badges166166 silver badges214214 bronze badges
...
Check if database exists in PostgreSQL using shell
...
12 Answers
12
Active
...
How to position a table at the center of div horizontally & vertically
... can set left and right margin to auto:
<style>
#test {
width:100%;
height:100%;
}
table {
margin: 0 auto; /* or margin: 0 auto 0 auto */
}
</style>
To center it vertically, the only way is to use javascript:
var tableMarginTop = Math.round( (testHeight - tableHei...
Update a record without first querying?
...
answered Nov 18 '10 at 19:15
CD..CD..
61.9k2424 gold badges131131 silver badges149149 bronze badges
...