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提问 - App Inventor 2 文网 - 清泛IT社区,为创新赋能!

...sp;使用下面程序时,为什么每次都会把实际数字设为0? 问题出在你的判断逻辑上: 这里和你拼接的字符串比较,非常容易出错,比如多了或少了一个空格等。实际编程判断最好使用数字,也就是你选择了难度等级是第几...
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进程间通信(IPC)的几种方式 - C/C++ - 清泛网 - 专注C/C++及内核技术

...不同进程的线程之间的通讯.而单个进程之间的线程同步问题可归并为一种特殊的进程通信.它要用到内核支持的系统调用来保持线程之间同步. 通常用到的一些线程同步方法包括:Event, Mutex, 信号量Semaphore, 临界区资源等. 465进程间...
https://www.tsingfun.com/it/cpp/2034.html 

Linux编程各种头文件 - C/C++ - 清泛网 - 专注C/C++及内核技术

... <fcntl.h> #include <fcntl.h> 涉及到用户权限及密码验证问题时加入如下语句: #include <shadow.h> #include <crypt.h> #include <pwd.h> 需要注意的是,应该在编译时链接加密算法库,即增加编译选项: -lcrypt 涉及到文件及时间操...
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什么是 Ringbuffer ? - C/C++ - 清泛网 - 专注C/C++及内核技术

...链表那样的数据结构进行比较,因为我并认为链表是实际问题的标准答案。 当你将Disruptor和基于 队列之类的实现进行比较时,事情将变得很有趣。队列通常注重维护队列的头尾元素,添加和删除元素等。所有的这些我都没有在...
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一致性hash和solr千万级数据分布式搜索引擎的应用 - 大数据 & AI - 清泛...

...多数情况都选择横向扩展的方式。如下图: 现在有个问题了,这600个数据如何路由到对应的机器。需要考虑如果均衡分配,假设我们600个数据都是统一的自增id数据,从1~600,分成3堆可以采用 id mod 3的方式。其实在真实环境可...
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How does View Controller Containment work in iOS 5?

...e animation, because uikit otherwise wouldn't know when to call your child VC's 'viewWillDisappear'. And at the end of the animation, when you call removeFromParentViewController, it can call 'didMove' automatically for you. – Chris Dec 12 '12 at 3:21 ...
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cpuid汇编指令 - C/C++ - 清泛网 - 专注C/C++及内核技术

...%.8X"),wCPU_SerialNo_64_93, wCPU_SerialNo_32_63, wCPU_SerialNo_00_31); 点击查看同类程序代码。 cpuid 汇编 指令
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Container View Controller Examples [closed]

...to. It's not my favorite demo code example, but it does properly implement VC containers as well as memory management -- it's really important that your child view controllers get released when they are no longer visible. – memmons Mar 28 '12 at 18:54 ...
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C++实现句柄多版本过期置old的思路 - C/C++ - 清泛网 - 专注C/C++及内核技术

C++实现句柄多版本过期置old的思路使用MVCC可以解决。轻量级的不使用MVCC的话,思路如下:核心ObjPtrmap<id, ObjPtr> map_;Get的时候返回最新的ObjPtr;当ObjPtr有新版本要更新的时候,将map对应id的ObjPtris 使用MVCC可以解决。 轻量...
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What is the difference between Modal and Push segue in Storyboards?

... A push Segue is adding another VC to the navigation stack. This assumes that VC that originates the push is part of the same navigation controller that the VC that is being added to the stack belongs to. Memory management is not an issue with navigation ...