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UIDevice uniqueIdentifier deprecated - What to do now?
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A UUID created by CFUUIDCreate is unique if a user uninstalls and re-installs the app: you will get a new one each time.
But you might want it to be not unique, i. e. it should stay the same when the user uninstalls and re-ins...
UUID max character length
We are using UUID as primary key for out oracle DB, and trying to determine an appropriate max character length for the VARCHAR. Apparently this is 36 characters but we have noticed UUID'S generated which are longer than this - up to 60 characters in length.
Does anyone know a suitable max char leng...
Generate a random alphanumeric string in Cocoa
...yourself to hex characters only, then the simplest option is to generate a UUID:
NSString *uuid = [NSUUID UUID].UUIDString;
Example output: 16E3DF0B-87B3-4162-A1A1-E03DB2F59654.
If you want a smaller random string then you can grab just the first 8 characters.
It's a version 4 UUID which means ...
Likelihood of collision using most significant bits of a UUID in Java
If I'm using Long uuid = UUID.randomUUID().getMostSignificantBits() how likely is it to get a collision. It cuts off the least significant bits, so there is a possibility that you run into a collision, right?
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How to generate a random alpha-numeric string?
...less likely than undetected errors from cosmic rays, etc.
Comparison with UUIDs
According to their specification, UUIDs are not designed to be unpredictable, and should not be used as session identifiers.
UUIDs in their standard format take a lot of space: 36 characters for only 122 bits of entro...
INT 10H 中断介绍 - C/C++ - 清泛网 - 专注C/C++及内核技术
...示器所提供的服务程序。使用 INT 10H 中断服务程序时，先指定 AH 寄存器为下表编号其中之一，该编号表示欲调用的功用，而其他寄存器的详细说明，参考表后文字，当一切设定好之后再调用 INT 10H。底下是它们的说明：
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搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...什么Bully算法？要明白这个我们先看看这两种架构：
指定主节点的架构，这种架构一般都会申明一个节点为主节点，其他节点都是从节点，如我们常用的mysql就是这样。但是这样架构我们在第一节说了整个集群如果主节点挂...
Is it safe to assume a GUID will always be unique?
..., for every cell in every person who has ever lived, there are 36 trillion UUIDs. You have about 10^14 cells in your body, and 106.5 billion people have ever lived. Or, 2.385 * 10^23 UUIDs for every cent in the US public debt.
– new123456
Aug 11 '11 at 1:47
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编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...理异常的地方(exception handler)。
4. 如果匹配不成功，就把搜索权限交还给OS，到下一个块继续搜索。
上面的对异常应该由那个catch块完成的搜索工作完成后，最后一步就是在exception handler的code中应该如何处理这个异常。这些代...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...理异常的地方(exception handler)。
4. 如果匹配不成功，就把搜索权限交还给OS，到下一个块继续搜索。
上面的对异常应该由那个catch块完成的搜索工作完成后，最后一步就是在exception handler的code中应该如何处理这个异常。这些代...