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为AppInventor2开发拓展(Extension) · App Inventor 2 中文网

...源码,使得开发者可以根据自己的需要,自定义开发原生组件实现不了的、更加强大的功能。 一般拓展采用java/kotlin语言进行开发,由于拓展开发相当于直接使用安卓原生开发语言开发安卓相关功能,因此理论上拓展可以实现...
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How do you write a migration to rename an ActiveRecord model and its table in Rails?

I'm terrible at naming and realize that there are a better set of names for my models in my Rails app. Is there any way to use a migration to rename a model and its corresponding table? ...
https://www.tsingfun.com/it/tech/1387.html 

iPhone App 开发第一步:从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...

...&mode=download 3、之后把iTunes升级到10.6以上版本,其它软件组件勿升级,即只下载iTunes最新版安装即可,否则可能系统白装。不升级iTunes的后果是,插上iPhone无反应,不识别。 4、网上学习如何在XCode中写一个HelloWorld,并在iOS 5.0...
https://bbs.tsingfun.com/thread-1623-1-1.html 

开源MQTT网关:EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区,为创新赋能!

...于业务需求的数据路由,EMQX 内置了基于 SQL 的规则引擎组件,搭配数据桥接使用,无需编写代码即可实现一站式的 IoT 数据提取、过滤、转换、存储与处理,以加速应用集成和业务创新。可操作性与可观测性Mosquitto 提供了基本...
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[since C++11] std::array的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术

...,并且添加了标准容器的一些接口使得数组可以和STL其他组件和谐工作。 综合示例 //----------------------- normal example ---------------------- RUN_GTEST(ArrayTest, NormalExample, @); array<int, 5> a = { 1, 2, 3 }; psln(a.size()); // a.size(...
https://bbs.tsingfun.com/thread-1934-1-1.html 

为AppInventor2开发自己的拓展(Extension) - App Inventor 2 拓展 - 清泛IT社区,为创新赋能!

...源码,使得开发者可以根据自己的需要,自定义开发原生组件实现不了的、更加强大的功能。一般拓展采用java/kotlin语言进行开发,由于拓展开发相当于直接使用安卓原生开发语言开发安卓相关功能,因此理论上拓展可以实现任...
https://www.tsingfun.com/it/tech/1079.html 

MVC演化史 - 更多技术 - 清泛网 - 专注C/C++及内核技术

... MVC。 Web MVP 在Desktop的时代,微软通过WinForms实现MVP,把组件化编程发挥到了极致,大大提升了开发效率,随着Web的兴起,微软希望延续这样的编程模式,所以使用WebForms实现了Web MVP,引入了CodeBehind,ViewState等设计概念。WebForms...
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Is it abusive to use IDisposable and “using” as a means for getting “scoped behavior” for exception

... I don't think so, necessarily. IDisposable technically is meant to be used for things that have non-managed resources, but then the using directive is just a neat way of implementing a common pattern of try .. finally { dispose }. A purist would argue 'yes - it's...
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Optimizing away a “while(1);” in C++0x

...sume we have the following loops, where count and count2 are global variables (or have had their address taken), and p is a local variable, whose address has not been taken: for (p = q; p != 0; p = p -&gt; next) { ++count; } for (p = q; p != 0; p = p -&gt; next) { ++count2; } Coul...
https://www.tsingfun.com/it/tech/897.html 

Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...而不是重新启动应用。 可以实现OnTrimMemory方法的系统组件有Application、Activity、Fragement、 Service、ContentProvider;关于OnTrimMemory释放哪些内存其实在架构阶段就要考虑清楚哪些对象是要常驻内存的,哪些是伴随组件周期存在的,...