assert

I have several assert(condition, "message") statements in my project. They are used to check invariant conditions during development . I thought they would be ignored in production/release build (as stated in this answer ). They are not. Instead they cause crashes during TestFlight testing. When I comment asserts the app does not crash. Something usually gets wrong a bit but it does not crash. Can it be something with my build settings? All my archive schemes use release configuration: The asserts are in Cocoa Touch Framework project, that is used from custom keyboard extension. All the

Python的 assert 是用来 检查 一个条件，如果它为真，就不做任何事。如果它为假，则会抛出AssertError并且包含错误信息。例如： x = 23 assert x > 0, "x is not zero or negative" assert x%2 == 0, "x is not an even number" 结果显示： 很多人用assert作为一个很快和容易的方法来在参数错误的时候抛出异常。但这样做是错的，非常错误，有两个原因。首先 AssertError不是在测试参数时应该抛出的错误 。你不应该像这样写代码： x = "14" if not isinstance(x, int): raise AssertionError("not an int") 显示结果： 你应该抛出TypeError的错误，assert会抛出错误的异常。 那什么时候应该使用assert？没有特定的规则， 断言应该用于 ： 　　☆ 防御型的编程 　　☆ 运行时检查程序逻辑 　　☆ 检查约定 　　☆ 程序常量 　　☆ 检查文档 （在测试代码的时候使用断言也是可接受的，是一种很方便的单元测试方法，你接受这些测试在用-O标志运行时不会做任何事。我有时在代码里使用assert False来标记没有写完的代码分支，我希望这些代码运行失败。尽管抛出NotImplementedError可能会更好。）

I'm using NUnit to write unit tests for a libary a colleague of mine has written. His library contains a lot of Debug.Asserts which triggers on invalid input. When I'm writing the unit tests and give invalid input to his library, his Debug.Assert throws up a message box complaining about the bad input. I feel that it's a good thing that his library throws up an assert on invalid input, but at the same time I want the unit tests to cover bad input. But when I do this, the message box shows up and I have to manually click OK to continue with the remaining unit tests. In case it isn't clear, my

There are several questions on StackOverflow discussing the question of when one should use an assert statement versus throwing some exception. (Examples here , here , here , here , and here . However, I have come to suspect that the conventional wisdom of assert-versus-throw is based upon the assumption that you are running within a JVM. In the GWT universe, where your Java gets transliterated to JavaScript and runs in the context of a browser, the set of tradeoffs feels different: asserts are always compiled-away when running in a browser, and anything that keeps the size of your JavaScript

1.网络编程 1.1基本概念 目的： 实现进程间的通信 网络： 把多个主机连接起来，构成一个网络， 互联网： 把网络和网络 连接起来就构成了互联网。 ip： 在网络中唯一标示一台主机 端口： 在某个主机上唯一标示一个进程。 1.2网络模型 2.tcp编程流程 3. tcp实现 3.1tcp ser.c #include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<string.h> #include<assert.h> #include<sys/socket.h> #include<netinet/in.h> #include<arpa/inet.h> int main() { int sockfd=socket(AF_INET,SOCK_STREAM,0); assert(sockfd!=-1); struct sockaddr_in saddr,caddr; memset(&saddr,0,sizeof(saddr)); saddr.sin_family=AF_INET; saddr.sin_port=htons(6000); saddr.sin_addr.s_addr=inet_addr("127.0.0.1"); int res=bind(sockfd,(struct sockaddr*)&saddr

I know why assertive programming is good, so I want to use it with JavaScript. However, I don't want to show users error boxes, and it's unusual thing. Just ignore it and make them retry could be better. For example this code will make an error box and interrupt users. function getDomainFromURL(url) { assertTrue(url, 'URL should not be null'); ...parsing } So, I'd make like this. function getDomainFromURL(url) { if (!url) return; ...parsing } Second one is good for usability, I think, and first one is good for developing. Therefore, IMO it would be the best to combine these and make the assert

实验内容 初步掌握单元测试和TDD 理解并掌握面向对象三要素：封装、继承、多态 初步掌握UML建模 熟悉S.O.L.I.D原则 了解设计模式 实验要求 1.参考Intellj IDEA 简易教程 提交最后三个测试用例都通过的截图，截图上要有画图加水印，输入自己的学号。 2.参考 积极主动敲代码使用JUnit学习Java,以 TDD的方式研究学习StringBuffer，提交你的单元测试用例和测试通过的截图，截图要加上学号水印。 3.实验二 Java面向对象程序设计 对设计模式示例进行扩充，体会OCP原则和DIP原则的应用，初步理解设计模式用自己的学号%6进行取余 运算，根据结果进行代码扩充： 让系统支持Boolean类，并在MyDoc类中添加测试代码表明添加正确 4.以TDD的方式开发一个复数类Complex支持加减乘除。 5.使用StarUML对实验二中的代码进行建模，发类图的截图，加上学号水印。类图中至少两个类。 实验步骤 （一）单元测试 编程是智力活动，不是打字，编程前要把干什么、如何干想清楚才能把程序写对、写好。所以当想用程序解决问题时，要会写三种码：伪代码、产品代码、测试代码。 (2) TDD(Test Driven Devlopment, 测试驱动开发) TDD的一般步骤如下： 明确当前要完成的功能，记录成一个测试列表 快速完成编写针对此功能的测试用例

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is there a way to concat two lists in z3? Similar to the @ operator in ML? I was thinking of defining it myself but I don't think z3 supports recursive function definitions, i.e., define-fun concat ( (List l1) (List l2) List (ite (isNil l1) (l2) (concat (tail l1) (insert (head l1) l2)) ) ) 回答1: You are correct that SMT-Lib2 does not allow recursive function definitions. (In SMT-Lib2, function definitions are more like macros, they are good for abbreviations.) The usual trick is to declare such symbols as uninterpreted functions, and then