大约有 16,000 项符合查询结果（耗时：0.0247秒） [XML]
Why cast unused return values to void?
... It is "costless" if the time to write it and the subsequent time reading, understanding (and then ignoring) the code is free. IMO, writing (void) costs me time and energy and makes me wonder if the author knew how expressions work.
– wallyk
Jul 3 '12...
Identify if a string is a number
...the state machine takes O(2^n) where n is the length of the regex, whereas reading is O(k) where k is the length of the string being searched. So rebuilding the regex every time introduces a bias.
– Clément
Jan 5 '11 at 17:29
...
How to set timeout on python's socket recv method?
...n more than one socket at a time.
import select
mysocket.setblocking(0)
ready = select.select([mysocket], [], [], timeout_in_seconds)
if ready[0]:
data = mysocket.recv(4096)
If you have a lot of open file descriptors, poll() is a more efficient alternative to select().
Another option is to...
What is the purpose of “&&” in a shell command?
...understand what the program considers a "failure" and how it handles it by reading the documentation and, if necessary, the source code.
Your shell considers a return value of 0 for true, other positive numbers for false
Programs return a signal on exiting. They should return 0 if they exit succes...
How can I check in a Bash script if my local Git repository has changes?
...
For reference, and if I read this right, $1 is a string naming a task you want to run and $2 is a string optionally containing a custom error message on failure. For example, call it like require_clean_work_tree deploy "Skipping deploy, clean up yo...
How to run Visual Studio post-build events for debug build only
... what the compiler does under the covers, as long as I get to write nicely readable code. (not that using goto isn't occasionally very easy to read)
– gbjbaanb
May 24 '12 at 13:23
...
C++ catching all exceptions
...Trying to catch exceptions won't help there.
Just for the case someone is reading this thread and thinks he can get the cause of the program crashes. A Debugger like gdb should be used instead.
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event.preventDefault() vs. return false
...nd MSIE "attached" events are a different matter altogether.
For further reading, see attachEvent on MSDN and the W3C DOM 2 Events documentation.
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Adding options to select with javascript
...;
elOption.text = i;
}
elMainSelect.appendChild(frag);
}
You can read more about DocumentFragment on MDN, but here's the gist of it:
It is used as a light-weight version of Document to store a segment of
a document structure comprised of nodes just like a standard document.
The key...
Run a Java Application as a Service on Linux
...ERVICE_NAME started ..."
else
echo "$SERVICE_NAME is already running ..."
fi
;;
stop)
if [ -f $PID_PATH_NAME ]; then
PID=$(cat $PID_PATH_NAME);
echo "$SERVICE_NAME stoping ..."
kill $PID;
echo "$SERVICE_NAME ...