iostream

Why do we get the build error “error C2065: 'ostringstream' : undeclared identifier” & How to fix this?

由 妖精的绣舞 提交于 2020-02-04 09:33:06
问题 Hi I am compilinig a C++ solution in VS2008. ostringstream strout; I am getting the compilation error " error C2065: 'ostringstream' : undeclared identifier ". I feel I have included all the necessary header files. Can anyone kindly let me know how to fix this error (What all header files to include) ? Also I am getting a strange error like "error C2146: syntax error : missing ';' before identifier 'strout' " at the same line. Whereas I know that I havent missed ";" semi-colon @ the line whre

[原]tornado源码分析系列（五）[HTTPServer 层]

由 狂风中的少年 提交于 2020-02-04 07:44:31
引言:第四章讲解的有些乱，主要是代码太长了，而且还是在一章就讲完了，所以我决定将IOStream上层的HTTPServer类分作几章来讲，不按照代码顺序 在讲完了IOLoop和IOStream后就知道，第一次在监听套接口的时候需要用到IOLoop，然后创建一个IOStream对象，然后以后的IO操作都由IOStream对象完成 所以在上层的HTTP协议处理中，tornado定义了一个HTTPConnection类 这个类主要完成的工作就是完成对下，完成HTTP数据包的传输，对上层HTTPserver提供解析后的request对象 那么他们之间的工作模式是怎样的呢 看看Demo import httpserver import ioloop def handle_request(request): message = "You requested %s\n" % request.uri request.write("HTTP/1.1 200 OK\r\nContent-Length: %d\r\n\r\n%s" % ( len(message), message)) request.finish() http_server = httpserver.HTTPServer(handle_request) http_server.listen(8888) ioloop.IOLoop

cin, getline, leading whitespace: ignore vs ws

由 送分小仙女□ 提交于 2020-02-01 09:15:51
问题 So every once in a while, when I read documentation for getline, I get reminded of the infamous whitespace issue. Yes, I know what it is. This question is about the supposedly standard solution std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); Meanwhile, I was always using std::cin >> std::ws; The difference between the two being mainly mine one does also ignore whitespace at the beginning of the line. That said, for many uses it is sufficient or equivalent, and arguably

cin, getline, leading whitespace: ignore vs ws

由 瘦欲@ 提交于 2020-02-01 09:15:32
问题 So every once in a while, when I read documentation for getline, I get reminded of the infamous whitespace issue. Yes, I know what it is. This question is about the supposedly standard solution std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); Meanwhile, I was always using std::cin >> std::ws; The difference between the two being mainly mine one does also ignore whitespace at the beginning of the line. That said, for many uses it is sufficient or equivalent, and arguably

How does <iostream> work? (C++)

由 老子叫甜甜 提交于 2020-02-01 07:03:59
问题 Just out of curiosity, how does iostream access the input-output system. (I have a bad habit of constantly reinventing the wheel, and I'm wondering if I can build a custom input-output system to the likes of iostream). 回答1: For a detailed guide to IOstreams, see the book Standard C++ IOStreams and Locales. After reading it I suspect you will be content to manage with with the status quo - IOStreams are probably the most complex part of the C++ standard library. 回答2: It depends... It somehow

How does <iostream> work? (C++)

由 守給你的承諾、 提交于 2020-02-01 07:01:28
问题 Just out of curiosity, how does iostream access the input-output system. (I have a bad habit of constantly reinventing the wheel, and I'm wondering if I can build a custom input-output system to the likes of iostream). 回答1: For a detailed guide to IOstreams, see the book Standard C++ IOStreams and Locales. After reading it I suspect you will be content to manage with with the status quo - IOStreams are probably the most complex part of the C++ standard library. 回答2: It depends... It somehow

How does <iostream> work? (C++)

由 女生的网名这么多〃 提交于 2020-02-01 07:01:08
问题 Just out of curiosity, how does iostream access the input-output system. (I have a bad habit of constantly reinventing the wheel, and I'm wondering if I can build a custom input-output system to the likes of iostream). 回答1: For a detailed guide to IOstreams, see the book Standard C++ IOStreams and Locales. After reading it I suspect you will be content to manage with with the status quo - IOStreams are probably the most complex part of the C++ standard library. 回答2: It depends... It somehow

Thinking in C++前几章笔记（1）

由 家住魔仙堡 提交于 2020-01-28 15:49:02
Thinking in C++前几章笔记 1、对象：把问题空间中的事物和它们在解空间中表示行为称为对象。 万物皆对象，程序就是一组对象，对象之间通过发送消息互相通知做什么。创建抽象数据类型是面向对象程序设计的基本思想。所以程序设计中，所做的工作就是创造新的数据类型。而面向对象程序设计的难题之一，是在问题空间中的元素和解空间的对象之间建立一对一的映射。 2、代码重用是面向对象程序设计语言的最大优点之一。重用一个类最简单的方法就是直接使用这个类的对象，我们常称为组合（has a）。而继承（基类和派生类）是is a的关系。 3、我们把处理派生类型如同处理其基类型的过程称为向上类型转换(upcasting)。 4、理想的类应当一目了然。运行进行可能是OOP最主要的好处。引入一个库，就是在向该语言引入一个新的类型。 5、极限编程（XP,eXtreme Programming）:先写测试；结对编程（两个人）。 8、asm关键字 这是一种转义（escape）机制，允许在C++程序中写汇编代码。 9、调试技巧 1）使用预处理调试标记 #define DEBUG //... #ifdef BEBUG //debugging code here #endif//DEBUG 2）把变量和表达式转换成字符串 在一个预处理器宏中的参数前面使用一个#,预处理器会把这个参数转换为一个字符数组。（原文：When

What serious alternatives exist for the IOStream library? (besides cstdio)

由 吃可爱长大的小学妹 提交于 2020-01-28 14:12:48
问题 I'm looking for a library which operates similar to iostreams, in that it performs conversions, and allows writing to memory buffers, files, and the console. However, I'd like something type safe, as iostream is. Are there any serious libraries which do this? Being able to specify the output encoding for things would be a plus. Note that I'm not interested in libraries which simply front iostreams because they just add more complexity to what iostreams is doing, e.g. boost::format .

What serious alternatives exist for the IOStream library? (besides cstdio)

由 烈酒焚心 提交于 2020-01-28 14:12:07
问题 I'm looking for a library which operates similar to iostreams, in that it performs conversions, and allows writing to memory buffers, files, and the console. However, I'd like something type safe, as iostream is. Are there any serious libraries which do this? Being able to specify the output encoding for things would be a plus. Note that I'm not interested in libraries which simply front iostreams because they just add more complexity to what iostreams is doing, e.g. boost::format .
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