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Why can't strings be mutable in Java and .NET?
...en somehow you manage to change the
file name you can request to open
"passwd" file or any other. Then a
file can be modified and it will be
possible to login directly to OS.
Second - Memory efficiency http://hikrish.blogspot.com/2006/07/why-string-class-is-immutable.html
JVM internall...
In C/C++ what's the simplest way to reverse the order of bits in a byte?
...up table.
//Index 1==0b0001 => 0b1000
//Index 7==0b0111 => 0b1110
//etc
static unsigned char lookup[16] = {
0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf, };
uint8_t reverse(uint8_t n) {
// Reverse the top and bottom nibble then swap them.
return (looku...
Can't pickle when using multiprocessing Pool.map()
...he pool size. Here is a short example :
from multiprocessing import Pool, cpu_count
from multiprocessing.pool import ApplyResult
# --------- see Stenven's solution above -------------
from copy_reg import pickle
from types import MethodType
def _pickle_method(method):
func_name = method.im_fu...
How to detect DIV's dimension changed?
...in: Uses a setTimeout checking all the time DOM layout props (clientHeight etc) where each check is very slow but needs to be checked often to have same functionality.
– Marc J. Schmidt
Sep 27 '16 at 14:01
...
Any reason not to use '+' to concatenate two strings?
... matter of other Python implementations, such as pypy, jython, ironpython, etc...
– jsbueno
Apr 6 '12 at 13:50
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Why does Double.NaN==Double.NaN return false?
...cluding NaN. This is part of the IEEE 754 standard and implemented by the CPU/FPU. It is not something the JVM has to add any logic to support.
http://en.wikipedia.org/wiki/NaN
A comparison with a NaN always returns an unordered result even when comparing with itself. ... The equality and ine...
Scheduling recurring task in Android
...n is not currently running. For normal timing operations (ticks, timeouts, etc) it is easier and much more efficient to use Handler.
Timer
timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
synchronized public void run() {
\\ here your todo;
}
...
Mac OSX Lion DNS lookup order [closed]
After upgrading to Mac OSX Lion I figured out that /etc/hosts is not looked up in first place for name resolution anymore. This leads to some side effects like:
...
Nginx缓存解决方案：SRCache - 更多技术 - 清泛网 - 专注C/C++及内核技术
...多的时候，冗余的浪费将非常严重，此外还有数据一致性问题，所以它只是一个粗线条的解决方案。
对此类问题而言，SRCache是一个细粒度的解决方案。其工作原理大致如下：
SRCache工作原理
当问题比较简单的时候，通常SRC...
Completely uninstall PostgreSQL 9.0.4 from Mac OSX Lion?
... removed.
sudo rm -rf /Library/PostgreSQL
Remove the ini file:
sudo rm /etc/postgres-reg.ini
Remove the PostgreSQL user using System Preferences -> Users & Groups.
Unlock the settings panel by clicking on the padlock and entering your password.
Select the PostgreSQL user and click on th...