大约有 15,580 项符合查询结果（耗时：0.0236秒） [XML]
Why is require_once so bad to use?
... only included it once should suffice but if you're still getting redefine errors, you could something like this:
if (!defined('MyIncludeName')) {
require('MyIncludeName');
define('MyIncludeName', 1);
}
I'll personally stick with the *_once statements but on silly million-pass benchmark,...
Byte order mark screws up file reading in Java
...e> to use system default encoding.
* @throws IOException If an I/O error occurs.
*/
public UnicodeReader(InputStream in, String defaultEncoding) throws IOException {
byte bom[] = new byte[BOM_SIZE];
String encoding;
int unread;
PushbackInputStream pus...
public friend swap member function
...t;
void swap<T>(myclass<T>&, myclass<T>&) // error! no partial specialization
{
// swap
}
}
This method works some of the time, but not all of the time. There must be a better way.
There is! We can use a friend function, and find it through ADL:
na...
Creating a singleton in Python
...
@PaulKenjora You must have an error in your code. If you define a global variable in a module, when you access it from another module it should have the value.
– warvariuc
Mar 30 '17 at 19:40
...
REST vs JSON-RPC? [closed]
...ne of code.
Last but not least, using HTTP as an RPC protocol is a huge error according to the designer of HTTP 1.1 (and inventor of REST): http://www.ics.uci.edu/~fielding/pubs/dissertation/evaluation.htm#sec_6_5_2
shar...
How do cache lines work?
... render the CPU worthless (defect) so large L1, L2, L3 caches increase the error rate which decreases the yield which directly decreases ROI. So there is a huge trade off when it comes to available cache size.
(currently one creates more L1, L2, L3 caches in order to be able to deactivate certain p...
How do you calculate the average of a set of circular data? [closed]
...good ones, but still off by 1 or 2 ulps) so the more you average, the more errors you include.
– Matthieu
Mar 17 '16 at 10:46
add a comment
|
...
Multiprocessing - Pipe vs Queue
...19, in __init__
self.run(args)
File "foo.py", line 46, in run
KeyError: 'that'
Source Code:
"""
multi_pipe.py
"""
from multiprocessing import Process, Pipe
import time
def reader_proc(pipe):
## Read from the pipe; this will be spawned as a separate Process
p_output, p_input =...
Which is more preferable to use: lambda functions or nested functions ('def')?
...f p(x): print x
works as expected, while
lambda x: print x
is a SyntaxError.
Of course, there are workarounds - substitute print with sys.stdout.write, or import with __import__. But usually you're better off going with a function in that case.
...
Why doesn't C++ have a garbage collector?
...while in C++ RAII is implicit so that the user CANNOT unwittingly make the error (by omitting the using keyword)
3. Smart Pointers
Smart pointers often appear as a silver bullet to handle memory in C++. Often times I have heard: we don't need GC after all, since we have smart pointers.
One could...