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Random shuffling of an array
... one in an object just to do a sort is a bit costly, both in memory and in CPU.
– PhiLho
Jul 11 '14 at 11:11
14
...
How can I maintain fragment state when added to the back stack?
... back stack. However, when I return to FragmentA (by pressing back), a totally new FragmentA is created and the state it was in is lost. I get the feeling I'm after the same thing as this question, but I've included a complete code sample to help root out the issue:
...
How to determine the memory footprint (size) of a variable?
... This is what I've done on my Ubuntu server to enable it:
sudo apt-get install libjudy-dev libjudydebian1
sudo pecl install memprof
echo "extension=memprof.so" > /etc/php5/mods-available/memprof.ini
sudo php5enmod memprof
service apache2 restart
And then in my code:
<?php
memprof_enable();
//...
Macro vs Function in C
...uct webpage page;
page.numButtons = 2;
num_button_holes(page) -> 8
Finally, macros can be difficult to debug, producing weird syntax errors or runtime errors that you have to expand to understand (e.g. with gcc -E), because debuggers cannot step through macros, as in this example:
#define prin...
Casting vs using the 'as' keyword in the CLR
...d within the if body.) That's slightly annoying in some cases, so if you really care about introducing the smallest number of variables possible in every scope, you might still want to use is followed by a cast.
I don't think any of the answers so far (at the time of starting this answer!) have r...
Evaluating a mathematical expression in a string
...p://pyparsing.wikispaces.com/message/view/home/15549426
'''
__note__ = '''
All I've done is rewrap Paul McGuire's fourFn.py as a class, so I can use it
more easily in other places.
'''
class NumericStringParser(object):
'''
Most of this code comes from the fourFn.py pyparsing example
...
What is the relative performance difference of if/else versus switch statement in Java?
...ic interface Action {
void execute(String input);
}
And get hold of all implementations in some Map. You can do this either statically or dynamically:
Map<String, Action> actions = new HashMap<String, Action>();
Finally replace the if/else or switch by something like this (leav...
01_Real Application Clusters Overview - 文档下载 - 清泛网 - 专注IT技能提升
...正应用集群
ASM管理存储，Oracle自己的文件系统
心跳ip有问题，关闭次节点只留主节点，防止数据混乱
virtual ip 可漂移，private ip 心跳ip，scan ip DNS解析
ntp服务禁用（时间同步服务，Oracle自己有同步）
grid 用户：存储、集群管...
01_Real Application Clusters Overview - 文档下载 - 清泛网 - 专注IT技能提升
...正应用集群
ASM管理存储，Oracle自己的文件系统
心跳ip有问题，关闭次节点只留主节点，防止数据混乱
virtual ip 可漂移，private ip 心跳ip，scan ip DNS解析
ntp服务禁用（时间同步服务，Oracle自己有同步）
grid 用户：存储、集群管...
01_Real Application Clusters Overview - 文档下载 - 清泛网移动版 - 专注IT技能提升
...正应用集群
ASM管理存储，Oracle自己的文件系统
心跳ip有问题，关闭次节点只留主节点，防止数据混乱
virtual ip 可漂移，private ip 心跳ip，scan ip DNS解析
ntp服务禁用（时间同步服务，Oracle自己有同步）
grid 用户：存储、集群管...