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What is the dependency inversion principle and why is it important?
... should depend upon abstractions.
Abstractions should never depend upon details. Details should depend upon abstractions.
As to why it is important, in short: changes are risky, and by depending on a concept instead of on an implementation, you reduce the need for change at call sites.
Effectivel...
How efficient is locking an unlocked mutex? What is the cost of a mutex?
...ens often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking.
How efficient is it to lock a mutex? I.e. how much assembler instructions are there likely and how much time do they take (in the case that the mutex...
What's the difference between utf8_general_ci and utf8_unicode_ci?
..., utf8 is a flawed UTF-8 implementation from early MySQL versions which remains only for backward compatibility. The fixed version was given the name utf8mb4.
Note: Newer versions of MySQL have updated Unicode sorting rules, available under names such as utf8mb4_0900_ai_ci for equivalent rules based...
Algorithm to compare two images
...the copy may do stuff like rotating, making negative, or adding trivial details (as well as changing the dimension of the image).
...
Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...正则表达式
< <= > >= != ==
关系运算符
空格
连接
+ -
加，减
* / &
乘，除与求余
+ - !
一元加，减和逻辑非
^ ***
求幂
++ --
增加或减少，作为前缀或后缀
$
字段引用
in
...
cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术
...管是那组功能，如何知道EAX中的功能代码最大可以是多少呢？根据Intel的说明，可以用如下方法：
mov eax, 0
cpuid
执行完CPUID指令后，EAX中返回的值就是返回基本信息时，功能代码的最大值，在执行CPUID指令要求返回基本...
How to convert number to words in java
..." ");
}
/**
* testing
* @param args
*/
public static void main(String[] args) {
System.out.println("*** " + EnglishNumberToWords.convert(0));
System.out.println("*** " + EnglishNumberToWords.convert(1));
System.out.println("*** " + EnglishNumberToWords.convert(16));
S...
Bomb dropping algorithm
...g layer 1, because the
"blast radius" you get from doing so is always contained within the blast radius of
another square from layer 2. You should be able to easily convince yourself of this.
So, we can reduce the problem to finding an optimal way to bomb away the perimeter, then we can repeat t...
Get MIME type from filename extension
...emoved, so you should be extra cautious and add double checks and provide fail safe action for every step.
MimeMapping._mappingDictionary.AddMapping(string fileExtension, string mimeType)
share
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REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...的情况修改
NETMASK=255.255.240.0
GATEWAY=192.168.0.254 #我要连接外网所以加了网关和DNS
DNS1=218.85.157.99
DNS2=58.22.96.66
修改后不要忘记了重启网络服务
service network restart
3、/etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost...