Background: I've found myself with the unenviable task of porting a C++ GNU/Linux application over to Windows. One of the things this application does is search for shared libraries on specific paths and then loads classes out of them dynamically using the posix dlopen() and dlsym() calls. We have a very good reason for doing loading this way that I will not go into here. The Problem:
背景: 我发现自己将一个C ++ GNU / Linux应用程序移植到Windows上是不值得的任务。 这个应用程序所做的一件事就是搜索特定路径上的共享库,然后使用posix dlopen()和dlsym()调用动态加载它们。 我们有一个非常好的理由来做这种装载,我不会在这里进入。 问题: 要使用dlsym()或GetProcAddress()动态发现由C ++编译器生成的符号,必须通过使用extern“C”链接块来解除其编译。 例如: #include <list> #inc
Are there any compilers capable of performing return value optimization on multiple values returned from a function through std::tuple? To be clear, in the following code, are there any compilers capable of avoiding unnecessary copies? std::vector<int> a; std::list<float> b; std::tie(a,b) = myFunctionThatReturnsAVectorAndList(); It's not worth worrying anymore. If the compiler
是否有任何编译器能够对通过std :: tuple从函数返回的多个值执行返回值优化? 清楚的是,在下面的代码中,是否有能够避免不必要副本的编译器? std::vector<int> a; std::list<float> b; std::tie(a,b) = myFunctionThatReturnsAVectorAndList(); 不值得担心了。 如果编译器不能执行RVO,则移动语义将会启动。
I want to write a function in C++ to replace C's sscanf that assigns the matches to iterator. Basically, I want something like: string s = "0.5 6 hello"; std::vector<boost::any> any_vector; sscanv(s, "%f %i %s", any_vector); cout << "float: " << any_cast<float>(any_vector[0]); cout << "integer: " << any_cast<integer(any_vector[1]); cout << "stri
我想用C ++编写一个函数来替换C的sscanf,它将匹配分配给迭代器。 基本上,我想要的东西是: string s = "0.5 6 hello"; std::vector<boost::any> any_vector; sscanv(s, "%f %i %s", any_vector); cout << "float: " << any_cast<float>(any_vector[0]); cout << "integer: " << any_cast<integer(any_vector[1]); cout << "string: " << any_cast<string>(any_vec
I'm working on a large c++ system that is has been in development for a few years now. As part of an effort to improve the quality of the existing code we engaged on a large long-term refactoring project. Do you know a good tool that can help me write unit tests in C++? Maybe something similar to Junit or Nunit? Can anyone give some good advice on the methodology of writing unit tests f
我正在研究一个已经开发了几年的大型c ++系统。 作为提高现有代码质量的努力的一部分,我们参与了一个大型的长期重构项目。 你知道一个好的工具,可以帮助我用C ++编写单元测试吗? 也许类似于Junit或Nunit? 任何人都可以为编写单元测试的方法写出一些很好的建议,这些模块是在没有单元测试的情况下编写的? 对遗留代码应用单元测试是编写遗留代码有效工作的原因 。 Michael Feathers是作者 - 正如其他答案中提到的那
This is a difficult and open-ended question I know, but I thought I'd throw it to the floor and see if anyone had any interesting suggestions. I have developed a code-generator that takes our python interface to our C++ code (generated via SWIG) and generates code needed to expose this as WebServices. When I developed this code I did it using TDD, but I've found my tests to be brittle
这是我所知道的一个困难而开放的问题,但我想我会把它放在地板上,看看是否有人有任何有趣的建议。 我开发了一个代码生成器,它将我们的Python接口添加到我们的C ++代码中(通过SWIG生成),并生成将其作为WebServices公开的代码。 当我开发这个代码时,我使用TDD做了它,但是我发现我的测试很脆弱。 因为每个测试本质上都想验证给定的输入代码位(这恰好是一个C ++头文件),我会得到一个给定的输出代码位,我写了一个小引
I'm currently using jenkins/hudson for continuous integration a large mostly C++ project. We have separate projects for trunk and every branch. Also, there are some related projects for the Java code, but the setup for those are fairly basic right now (we may do more later though). The C++ projects do the following: Builds everything with options for whether to reconfigure, do a clean bu
我目前正在使用jenkins / hudson进行持续集成,主要是C ++项目。 我们为主干和每个分支分别开发项目。 此外,还有一些与Java代码相关的项目,但现在对于这些项目的设置相当基本(尽管我们可能会做更多的事情)。 C ++项目执行以下操作: 可以选择是否重新配置,做一个干净的版本,或使用全新的结帐 有选择地构建并运行所有测试 可以使用Valgrind的memcheck运行所有测试 运行cppcheck 生成doxygen文档 发布报告:
I'm writing a template class, and I want to allow an additional method to exist only for a certain template type. Currently the method exists for all template types, but causes a compilation error for all other types. Complicating this is that it's an overloaded operator(). Not sure if what I want to do is actually possible here. Here's what I have now: template<typename T,
我正在编写一个模板类,并且我想让一个额外的方法只存在于某个特定的模板类型中。 目前该方法适用于所有模板类型,但会导致所有其他类型的编译错误。 复杂的是它是一个重载的运算符()。 不知道我想要做什么实际上可能在这里。 这是我现在拥有的: template<typename T, typename BASE> class MyClass : public BASE { public: typename T& operator() (const Utility1<BASE>& foo); typen
I need to create a GUI with a file menu and menu in which the user can input parameters. The parameters are then used for drawing rectangles in a canvas which is part of the application window. Is there a way to scale the OpenGL subwindow to just one part of the screen and the parameter input to the other? The application needs to be written in C++. Is it possible to create a GUI with QT and
我需要创建一个带有文件菜单和用户可以在其中输入参数的菜单的GUI。 这些参数然后用于在作为应用程序窗口一部分的画布中绘制矩形。 有没有办法将OpenGL子窗口缩放到屏幕的一部分,并将参数输入到另一部分? 应用程序需要用C ++编写。 是否有可能使用QT创建GUI,并使用OpenGL在同一窗口中绘制矩形? 如果没有,将GUI与OpenGL集成的常用方法是什么? (或者我可以使用任何其他图形库从点尽可能容易地绘制矩形) 编辑:我
My wxWidgets application has a main wxFrame with a wxAUIManager. In four panes i have a wxTreeCtrl, a wxNotebook (in a wxPanel to manage flickering), a wxListBox and an wxGLCanvas respectively. To manage a flickering issue I would like to have the wxFrame double-buffered. This, however, disturbs the rendering of the wxGLCanvas (I guess this is due to the double-buffered nature of the wxGLCanv
我的wxWidgets应用程序有一个带wxAUIManager的主wxFrame。 在四个窗格中,我有一个wxTreeCtrl,一个wxNotebook(在wxPanel中管理闪烁),一个wxListBox和一个wxGLCanvas。 为了管理闪烁的问题,我想让wxFrame具有双缓冲功能。 但是,这会干扰wxGLCanvas的渲染(我想这是由于wxGLCanvas本身的双重缓冲本质)。 有没有办法使用wxGLCanvas作为双缓冲wxFrame的孩子而不会扭曲渲染? 我在Windows 10机器上使用wxWidgets 3.1.0
I have an application which draws background from some bitmap using gdi+. Some of bitmaps are vertical non-linear gradients (eg they are 1 pixel wide and should be stretched horizontally to fill whole control width). The problem is that with small images (like described above), some control area on the right is not painted. I've written a test program that scales a 1x1 image to different
我有一个应用程序使用gdi +从一些位图绘制背景。 一些位图是垂直的非线性渐变(例如它们是1个像素宽,应该水平伸展以填充整个控制宽度)。 问题在于,对于小图像(如上所述),右侧的一些控制区域未被绘制。 我已经编写了一个测试程序,可以将1x1图像缩放到不同的大小,并且显示当缩放因子足够大时会发生问题 void Draw(HDC hDestDC, int destleft, int desttop, int destwidth, int destheight) { COLORREF buffer[] =