assert

g++ doesn't compile constexpr function with assert in it

我们两清 提交于 2019-11-28 21:42:57
template<typename T> constexpr inline T getClamped(const T& mValue, const T& mMin, const T& mMax) { assert(mMin < mMax); // remove this line to successfully compile return mValue < mMin ? mMin : (mValue > mMax ? mMax : mValue); } error : body of constexpr function 'constexpr T getClamped(const T&, const T&, const T&) [with T = long unsigned int]' not a return-statement Using g++ 4.8.1 . clang++ 3.4 doesn't complain. Who is right here? Any way I can make g++ compile the code without using macros? GCC is right. However, there is a relatively simple workaround: #include "assert.h" inline void

Why does assert simply terminate a program compiled for iPhone?

点点圈 提交于 2019-11-28 20:38:25
问题 I'm debugging a heavily assert()'ed iPhone app (Xcode, Objective-C++, and device simulator). In some cases, the assert failure would just terminate the app, instead of breaking into the debugger as I'd expect. I made a workaround by implementing my own kinda-assert to the effect of: #define AssertLite(b) if(!(b)) {asm {int 3}} (fluff omitted), but I wonder if anyone ever encountered this. I could not determine a pattern as to when does it break and when does it terminate. The code is not

What is the best way of implementing assertion checking in C++?

筅森魡賤 提交于 2019-11-28 20:21:05
问题 By that I mean, what do I need to do to have useful assertions in my code? MFC is quite easy, i just use ASSERT(something). What's the non-MFC way? Edit: Is it possible to stop assert breaking in assert.c rather than than my file which called assert()? Edit: What's the difference between <assert.h> & <cassert> ? Accepted Answer: Loads of great answers in this post, I wish I could accept more than one answer (or someone would combine them all). So answer gets awarded to Ferruccio (for first

How can I check if some text exist or not in the page using Selenium?

笑着哭i 提交于 2019-11-28 20:04:17
I'm using Selenium WebDriver, how can I check if some text exist or not in the page? Maybe someone recommend me useful resources where I can read about it. Thanks With XPath , it's not that hard. Simply search for all elements containing the given text: List<WebElement> list = driver.findElements(By.xpath("//*[contains(text(),'" + text + "')]")); Assert.assertTrue("Text not found!", list.size() > 0); The official documentation is not very supportive with tasks like this, but it is the basic tool nonetheless. The JavaDocs are greater, but it takes some time to get through everything useful and

Debug.Assert vs. Specific Thrown Exceptions

心已入冬 提交于 2019-11-28 19:47:10
问题 I've just started skimming 'Debugging MS .Net 2.0 Applications' by John Robbins, and have become confused by his evangelism for Debug.Assert(...). He points out that well-implemented Asserts store the state, somewhat, of an error condition, e.g.: Debug.Assert(i > 3, "i > 3", "This means I got a bad parameter"); Now, personally, it seems crazy to me that he so loves restating his test without an actual sensible 'business logic' comment, perhaps "i <= 3 must never happen because of the

机器学习——简单线性回归(原理推导+算法描述+代码实现)

喜欢而已 提交于 2019-11-28 18:58:46
实验环境:Python 3.6 编辑器:Jupyter Notebook 6.0.1 实验要求:可以调用numpy、pandas基础拓展程序包,不可以调用sklearn机器学 ——————————————————我是分割线喵———————————————————— ————————————(如果想要代码可以直接下拉到最后)———————————— 线性模型的一般形式:    向量形式:    线性模型的优点:   1、形式简单、易于建模   2、可解释性   3、是非线性模型的基础,可以在线性模型的基础上引入层级结构或高维映射 举个西瓜书里的例子:   系数可以反应该属性对该瓜是否是好瓜的影响因素大小    单一属性的线性回归目标:    参数/模型估计:最小二乘法    最小化均方误差: 分别对ω和b求导,得: 得到闭式解: ——————————————————我是分割线喵———————————————————— 在jupyter notebook中的代码实现:      1、先用一个例子,模拟出点:              2、通过最小二乘法得到线性回归,红色标出: ——————————————————代码——————————————————— 二元的简单线性回归算法代码 ,可以作为自定义包留着以后用,我在sublime里面写的。   (如何在jupyter中导入自定义包?)

abap unit 断言异常

我与影子孤独终老i 提交于 2019-11-28 18:29:22
1:使用sy-subrc对异常进行断言。 CALL METHOD f_cut->if_crms4_product_api~get_gtin_by_id EXPORTING iv_product_id = lv_product_id IMPORTING et_gtin = lt_crms4t_product_gtin EXCEPTIONS not_found = 1 wrong_call = 2 OTHERS = 3. cl_abap_unit_assert=>assert_equals( act = sy-subrc exp = '1' ). 来源: https://www.cnblogs.com/liyafei/p/11420171.html

Exception vs. error-code vs. assert

北慕城南 提交于 2019-11-28 18:22:19
I'm working on a library that generates reports of devices. The generate_report (const std::string& no) member function can fail due to various reasons: invalid report no. invalid state (the report_generator is a FSM) no device is active error during report generation Which error-handling mechanism is best for these errors? just return true or false return error code assert and log throw exception(s) any combination of the above Some context information: the normal workflow is as following. The user activates a devices, chooses a report from a list and clicks on "generate". EDIT: Thanks for

cpu缓存和volatile

孤街醉人 提交于 2019-11-28 18:03:21
目录 CPU缓存的由来 CPU缓存的概念 CPU缓存的意义 缓存一致性协议-MESI协议 Store Buffers Store Forwarding Memory Barriers Invalidate Queues 读内存屏障 vs 写内存屏障 x86 架构下的实现 volatile与原子性 参考资料: CPU缓存的由来 我们知道CPU的处理能力要远比内存强,主内存执行一次内存读、写操作的时间可能足够处理器执行上百条的指令。为了弥补处理器与内存处理能力之间的鸿沟,在内存和处理器之间引入了高速缓存(Cache)。高速缓存是一种存取速率远比主内存大而容量远比主内存小的存储部件,每个处理器都有其高速缓存。如下图所示 CPU的读(load)实质上就是从缓存中读取数据到寄存器(register)里,在多级缓存的架构中,如果缓存中找不到数据(cache miss),就会层层读取二级缓存三级缓存,一旦所有的缓存里都找不到对应的数据,就要去内存里寻址了。寻址到的数据首先放到寄存器里,其副本会驻留到CPU的缓存中。 CPU的写(store)也是针对缓存作写入。并不会直接和内存打交道,而是通过某种机制实现数据从缓存到内存的写回(write back)。 CPU缓存的概念 CPU缓存是位于CPU与内存之间的临时数据交换器,它的容量比内存小的多但是交换速度却比内存要快得多