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C++对象布局及多态探索之菱形结构虚继承 - C/C++ - 清泛网 - 专注C/C++及内核技术

...继承。虚继承的引入本就是为了解决复杂结构的继承体系问题。上一篇我们在讨论虚继承时用的是一个简单的继承结构,...这次我们看看菱形结构的虚继承。虚继承的引入本就是为了解决复杂结构的继承体系问题。上一篇我们在...
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Python + Django page redirect

... patterns('', (r'^one/$', redirect_to, {'url': '/another/'}), #etc... ) There is more in the generic views documentation. Credit - Carles Barrobés. Update #2: Django 1.3+ In Django 1.5 redirect_to no longer exists and has been replaced by RedirectView. Credit to Yonatan from django...
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MySQL vs MongoDB 1000 reads

... to perform: One index lookup on the collection (assuming the entity is fetched by id) Retrieve the contents of one database page (the actual binary json document) So a b-tree lookup, and a binary page read. Log(n) + 1 IOs. If the indexes can reside entirely in memory, then 1 IO. In MySQL with ...
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iOS开发调试技巧总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...跑到出现异常的代码中呢???异常断点就为我们解决该问题,程序就会在异常出现的那行代码终止。创建异常断点图例如下: 如下所示就创建完成了。如果碰到异常crash时,尝试使用异常断点吧。 【4.符号断点Symbolic Breakp...
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“Variable” variables in Javascript?

... array could be defined automatically via an input, database query, event, etc. elements.forEach( (element) => { elementIds[element] = document.getElementById(element); }); This example declares variable variables (keys in elementIds) based on the ID of each element,...
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C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区,为创新赋能!

...问0x4的内存地址,不crash才怪。于是,你一定会有如下的问题:1)为什么不是 13行if语句出错?f.a被初始化为空了嘛,用空指针访问成员变量为什么不crash?2)为什么会访问到了0x4的地址?靠,4是怎么出来的?3)代码中的第4行...
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京东618:算法让UV价值提升200%+,用智能卖场缩短购物路径 - 更多技术 - 清...

...区画像,除了界面的差异,两者在后端的处理上要解决的问题有什么不同?对推荐搜索和移动研发、交易平台研发的协作有什么样的要求? 智能卖场团队:这两者要解决的问题本质上是相同的,所以用的算法引擎是相同的。但...
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What is the difference between the | and || or operators?

... know what that is. It's used in conditional statements such as if, while, etc. condition1 || condition2 Evaluates to true if either condition1 OR condition2 is true. | is the bitwise OR operator. It's used to operate on two numbers. You look at each bit of each number individually and, if one o...
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BIO与NIO、AIO的区别(这个容易理解) - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...于事件驱动思想来完成的,其主要想解决的是BIO的大并发问题: 在使用同步I/O的网络应用中,如果要同时处理多个客户端请求,或是在客户端要同时和多个服务器进行通讯,就必须使用多线程来处理。也就是说,将每一个客户...
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Check if passed argument is file or directory in Bash

...ou won't print any diagnosis for a block special, character special, FIFO, etc? Symlinks probably resolve to what's at the far end of the link; broken symlinks are more problematic. – Jonathan Leffler Mar 22 '19 at 15:14 ...