assert | 易学教程

Swift -Ounchecked and Assertions

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问题 Preface In Swift, ENABLE_NS_ASSERTIONS is ignored, and whether assertions are on or off is dependent of SWIFT_OPTIMIZATION_LEVEL , see here for more information. assert() is active for -Onone assertionFailure() is active for -Onone precondition() is active for -Onone and -O preconditionFailure() is active for -Onone , -O and -Ounchecked fatalError() is active for -Onone , -O and -Ounchecked What I want to achieve Debug and Beta Builds should have assertions enabled , Release Builds should

Assert Expression validation not working at attribute level in Symfony 2.4

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问题 I am trying to validate an attribute at a field level by the @Assert\Expression (http://symfony.com/doc/2.4/reference/constraints/Expression.html). It works at a class level with this code: /** * Foo * * @ORM\Table(name="foo") * @ORM\HasLifecycleCallbacks() * @UniqueEntity("slug") * @Assert\Expression( * "this.getPriceFor2PaxStandard() != null or (this.getPriceFor2PaxStandard() == null and !this.isPriceForAccLevelRequired('standard'))", * message="The price for 2 pax standard is required", *

How to use assert in OCaml?

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问题 I am trying to learn OCaml and I am having trouble with the assertion statement. In the interpreter I can use it: Zameers-MacBook-Air:~ zmanji$ ocaml OCaml version 4.01.0 # let x = 1;; val x : int = 1 # assert(x > 2);; Exception: Assert_failure ("//toplevel//", 1, 0). # ^D However when I put the code in a file that looks like this: let x = 1 assert(x > 2) I get the following error: Zameers-MacBook-Air:Q4 zmanji$ ocaml test.ml File "test.ml", line 2, characters 0-6: Error: Syntax error What am

How do you test the params hash in a Rails test?

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问题 The following generates an error: "undefined local variable or method `params'" assert_equal params[:recipient_id], users(:one).id How do you test the params hash? Also, how do you test assert_redirect when there are params present? The params are appended to the URL, so testing for model_path or similar fails. Working with built in test class in Rails 3. 回答1: http://guides.rubyonrails.org/testing.html#functional-tests-for-your-controllers gives some of this information. In this case, params

Correct use Java “assert” keyword

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问题 I have never understood what is assert used for, even though I have read plenty examples, they don't really let me know what or why should I use it for. So Instead of asking an example, I'm gonna provide one and let me know if this is the proper usage of assert . // The idea is that the `mode` variable should be 0 or 1, and no other number. switch(mode) { case 0: // do stuff break; case 1: // do other stuff break; default: // assert code? } If this is correct, please let me know how to use it

When assert() fails, what is the program exit code?

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问题 When an assert() call fails, what is the exit code used, and where is it documented? 回答1: The c99 standard states that assert calls abort and the abort stuff states this about the return code: An implementation-defined form of the status unsuccessful termination is returned to the host environment by means of the function call raise(SIGABRT). It's documented in section 7.2.1.1 (assert) and 7.20.4.1 (abort) of the c99 standard here. Many UNIX systems will return 128 plus the signal number

Snack3 之 Jsonpath使用

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Snack3 之 Jsonpath使用一、 Snack3 和 JSONPath 介绍 Snack3 是一个支持JSONPath的JSON框架。JSONPath是一个很强大的功能，也可以在Java框架中当作对象查询语言（OQL）来使用。 <dependency> <groupId>org.noear</groupId> <artifactId>snack3</artifactId> <version>3.1.5.10</version> </dependency> Snack3 借签了 Javascript 所有变量由 var 申明，及 Xml dom 一切都是 Node 的设计。其下一切数据都以 ONode 表示， ONode 也即 One node 之意，代表任何类型，也可以转换为任何类型。强调文档树的操控和构建能力做为中间媒体，方便不同格式互转高性能 Json path 查询（兼容性和性能很赞）支持序列化、反序列化二、接口 public class ONode{ //... /** * Json path select * * @param jpath json path express * @param useStandard use standard mode(default: false) * @param cacheJpath cache json

PHP危险函数

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部分内容转载 https://www.jianshu.com/p/277294c1a9f8 https://www.cnblogs.com/yewooo00/p/7551083.html 信息泄露 1、phpinfo函数输出 PHP 当前状态的大量信息，包含了 PHP 编译选项、启用的扩展、PHP 版本、服务器信息和环境变量（如果编译为一个模块的话）、PHP环境变量、操作系统版本信息、path 变量、配置选项的本地值和主值、HTTP 头和PHP授权信息 2、 scandir函数列出指定路径中的文件和目录 <?php var_dump(scandir('./')) ?> 执行代码函数 1、eval函数 eval ( string $code ) : mixed eval() 函数把字符串按照 PHP 代码来执行该字符串必须是合法的 PHP 代码，且必须以分号结尾。 eval('phpinfo();');在页面输出hello 2、assert函数 assert ( mixed $assertion [, Throwable $exception ] ) : bool assert — 检查一个断言是否为 FALSE 如果 assertion 是字符串，它将会被 assert() 当做 PHP 代码来执行 assert('phpinfo()'); 3、preg_replace函数

What is the best way of checking the matrix value in Unit test?

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What is the best way of checking the matrix value in Unit test? I have a method in my project, something like this: int[][] getMatrix() { int[][] ans = new int[1][]; ans[0] = new int[1]; ans[0][0] = 0; return ans; } I want to unit-test this class using visual studio standard testing engine, so I create a unit test, something like this: [TestMethod] public void Test() { var result = getMatrix(); int[][] correct = new int[1][]; correct[0] = new int[1]; correct[0] = 0; Assert.AreEqual(correct.Length, result.Length); for (int i = 0; i < correct.Length; ++i) { CollectionAssert.AreEqual(correct[i],

python assert使用说明

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python assert使用说明转载篇 2019-12-05 15:05:40 self.assertEqual(a,b,msg=msg) #判断a与1.b是否一致，msg类似备注，可以为空 self.assertNotEqual(a,b,msg=msg) #判断a与b是否不一致 self.assertTrue(a,msg=none) #判断a是否为True self.assertFalse(b,msg=none) #判断b是否为false self.assertAlmostEqual(a,b,places=none,msg=none,delta=none) #该判断过程有点复杂，判断过程如下注：places与delta不能同时存在，否则出异常 #若a==b，则直接输入正确，不判断下面的过程 #若delta有数，places为空，判断a与b的差的绝对值是否<=delta，满足则正确，否则错误 #若delta为空，places有数，判断b与a的差的绝对值,取小数places位，等于0则正确，否则错误 #若delta为空，places为空，默认赋值places=7判断例 assertAlmostEqual(2,2) 正确， assertAlmostEqual(5,2,delta=4) 正确 assertAlmostEqual(5,2,delta=2) 错误