Nowadays, I close a new small case. Proposition. For a surjective morphism between scheme $X\stackrel{f}\to Y$, For any $Z\to Y$, the base change $X\times_Y Z\to Z$ is also surjective. The diagram is as following $$\begin{array}{ccc} X\times_Y Z& \to…

Continuous Integration (CI) Continuous integration (CI) is the process that ensures the stability of all the available developer source code. All working copies of source code are merged into the trunk/main line (instead of a main branch, this can be…

C++ Core Guidelines September 9, 2015 Editors: Bjarne Stroustrup Herb Sutter This document is a very early draft. It is inkorrekt, incompleat, and pµøoorly formatted. Had it been an open source (code) project, this would have been release 0.6. Copy…

返回目录 之前和大家一起谈了工厂模式和单例模式,今天来看一下另一种非常常用的模式,它就是适配器模式,第一次看到这个模式是通过“张逸”老师的“设计之道”这篇文章,在这里表adapter讲的很透彻,今天把张老师的文章拿过来,分享给大家! 何时能用到它? 对于一个软件生产商A来说,在过去的20年里,它们主要生产收音机,包括最早的老式半导体和现代的数字收音机,总之,是收音机.但不知道从什么时候开始,MP4媒体播放器出现了,这使得A生产商不得不去招新人,去生产适合大家的mp4播放器,这东西很好,能听音乐,…

CakeDC Git workflow是一个项目开发和版本发布的工作流,在这个工作流程中开发和版本发布周期是基于几个关键阶段(key phases): Development: 所有活跃的开发活动都由里程碑驱动,在这个阶段的产出是很不稳定的代码基线 QA: Quality assurance testing作为一开发周期的一部分,主要协助确保需求的满足性和质量的可接受性 Review 客户或者评审员面对的是一个稳定的代码基线,该基线已经经过了QA流程,质量上已经被QA人员认可 Release 发…

elinux.org/Raspberry_Pi_Kernel_Compilation#Use_the_provided_compiler Software & Distributions: Software - an overview. Distributions - operating systems and development environments for the Raspberry Pi. Kernel Compilation - advice on compiling a ker…

题目:http://pat.zju.edu.cn/contests/pat-a-practise/1027 简单题,考察十进制数和n进制数的转换和输出格式的控制. People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit number, where the first 2 digi…

原文:PHP 使用用户自定义的比较函数对数组中的值进行排序 usort (PHP 4, PHP 5) usort —      使用用户自定义的比较函数对数组中的值进行排序 说明       bool usort        ( array &$array       , callable $cmp_function       ) 本函数将用用户自定义的比较函数对一个数组中的值进行排序.如果要排序的数组需要用一种不寻常的标准进行排序,那么应该使用此函数. Note: 如果两个成员比较结果相同…

title: libevent源码阅读笔记(一):libevent对epoll的封装 最近开始阅读网络库libevent的源码,阅读源码之前,大致看了张亮写的几篇博文(libevent源码深度剖析 http://blog.csdn.net/sparkliang/article/details/4957667 ),对libevent网络库有了总体上的认识,然后开始源码的阅读. 与整体把握不同,我是先从局部开始阅读libevent的源码,当然,前提是我已经大致了解了整个libevent的框架结构,今…

Overview This page explains how to rebuild the kernel image for the RPi. There are two possible routes available: Compile on the Raspberry Pi itself Cross compile on another Linux system Both of these routes are covered below, however, you are strong…