I have a multithreaded program in C++. The problem I face while trying to print something in the log through multiple threads and program crashes. The specific problem is that I have cout << "some log message" << endl; And when I see the pstack for the dumped core, it shows that endl caused the problem of contention. On one thread, I have: ff308edc _IO_do_write (ff341f
我在C ++中有一个多线程程序。 我在尝试通过多线程和程序崩溃在日志中打印某些内容时遇到的问题。 具体问题是我有cout <<“某些日志消息”<< endl; 当我看到转储核心的pstack时，它显示endl引起了争用问题。 在一条线上，我有： ff308edc _IO_do_write (ff341f28, ff341f6f, 2, ff341f6f, fc532a00, ff141f74) + dc ff3094d8 _IO_file_overflow (ff341f28, a, ff000000, 1c00, 0, fffc00) + 2a8 ff3101fc overf
I'm attempting to import a large amount of data from a file into a boost::dynamic_bitset. To accomplish this, I was hoping to use an istream_iterator which matches the block size of the dynamic_bitset (uint32_t). As shown below, I setup my ifstream using the location of the file to be imported. However, once I initialize the istream_iterator with the ifstream, the ifstream's fail bit
我试图从文件中将大量数据导入到boost :: dynamic_bitset中。 为了达到这个目的，我希望使用一个与dynamic_bitset（uint32_t）的块大小相匹配的istream_iterator。 如下所示，我使用要导入的文件的位置设置我的ifstream。 但是，一旦我用ifstream初始化istream_iterator，就会设置ifstream的失败位。 有关为何发生这种情况的任何建议？ ifstream memHashes (hashFileLocation, ios::in | ios::binary); if(memHashes.is_op
I want to read from a stream using std::getline inside a for loop. The stream I mean is a class inherited from the std::basic_iostream . std::string line; for(;;){ try{ std::getline( myStreamObj, line ); if( line != "" ){ std::cout << line << std::endl; } } catch( std::ios_base::failure& ex ){ std:
我想在for循环中使用std::getline从流中读取数据。 我的意思是一个从std::basic_iostream继承的类。 std::string line; for(;;){ try{ std::getline( myStreamObj, line ); if( line != "" ){ std::cout << line << std::endl; } } catch( std::ios_base::failure& ex ){ std::cout << ex.what() << std::endl
I looked at the earlier questions but still i was not satisfied, hence i am posting this. I was trying to compile the C++ code written by someone else. /* file1.h */ #include <stdio.h> #include <stdlib.h> typedef struct { struct { unsigned member1; unsigned member2; } str1; struct { unsigned member3; unsigned member4; }
我看了以前的问题，但仍然不满意，因此我发布了这个。 我试图编译别人编写的C ++代码。 /* file1.h */ #include <stdio.h> #include <stdlib.h> typedef struct { struct { unsigned member1; unsigned member2; } str1; struct { unsigned member3; unsigned member4; } str2; struct { unsigned member5; unsigned m
I'm now developing a json-rpc project in C++. I've not decided yet how I handle rpc's requests. From the client side, server receives jsons like below. {"method":"App1hoge", ...} {"method":"App1fuga", ...} {"method":"App2foo", ...} The server side handles some applications, App1, App2, etc. So I think I should design ApplicationRule class for each class. In this case, App1Rule an
我现在正在用C ++开发一个json-rpc项目。 我还没有决定如何处理rpc的请求。 从客户端，服务器接收像下面这样的jsons。 {"method":"App1hoge", ...} {"method":"App1fuga", ...} {"method":"App2foo", ...} 服务器端处理一些应用程序，App1，App2等。所以我认为我应该为每个类设计ApplicationRule类。 在这种情况下，需要App1Rule和App2Rule类。 我还应该设计ApplicationRuleManager来处理每个规则。 但我不确定我是如何设
From what I've read so far, using the FFI with C++ is very hard to accomplish. One of the biggest reasons seems to be converting C++ objects to Haskell. My problem now is that I don't have any experience with C, but a few years with C++, and also I prefer OOP. Therefore, I would naturally like to benefit from C++. So can I write C++ programs designed to be used by the Haskell FFI to
从我目前阅读的内容来看，使用FFI和C ++是非常难以完成的。 最大的原因之一似乎是将C ++对象转换为Haskell。 我现在的问题是，我对C没有任何经验，但用C ++几年，我更喜欢OOP。 因此，我自然会喜欢从C ++中受益。 那么我可以编写C ++程序来设计Haskell FFI用来解决这些问题吗？ C ++可以在底层做任何事情，但API应该是类C的，即我不交换对象，没有重载的顶级函数等等。 有没有什么缺陷需要注意？ （为了将我的项目与您
I'm writing a haskell wrapper for a c++ library and as much as I can import functions from the library to my haskell program, I have no clue how to import c++ data types. For instance I have a function which takes as a parameter a video::E_DRIVER_TYPE EDT_OPENGL type defined in some.h file, and as I said before I know how to import the function with ffi using foreign import ccall ... wit
我正在为c ++库编写一个haskell包装器，并且尽可能多地从该库中导入函数到我的haskell程序，我不知道如何导入c ++数据类型。 例如，我有一个函数，它将some.h文件中定义的video :: E_DRIVER_TYPE EDT_OPENGL类型作为参数，正如我之前所说的，我知道如何使用ffi导入函数 国外进口ccall ... 与适当的编译器错位的函数名称 但我无法从haskell调用函数，因为我无法弄清楚如何导入/使用这个特定的视频驱动数据类型。 现在，
Would somebody share their knowledge of OpenCV feature detection and extraction of fiducial markers? I'm attempting to find a fiducial marker (see image below) (self-created ARTag-style using MS Paint) in a scene. Using Harris corner detection, I can adequately locate the corners of the marker image. Similarly, using Harris corner detection, I can find most of the corners of the marker i
会有人分享他们的OpenCV特征检测和提取基准标记的知识吗？ 我试图在场景中找到一个基准标记（见下图）（使用MS Paint自行创建ARTag样式）。 使用哈里斯角点检测，我可以充分找到标记图像的角落。 同样，使用哈里斯角点检测，我可以找到场景中标记的大部分角落。 然后我使用SIFT为标记图像和场景图像提取描述符。 然后我尝试了BF和FLANN来进行特征匹配。 但是，两种匹配算法都倾向于将错误的角落匹配在一起。 有什么我
I need a map-like data structure (in C++) for storing pairs (Key,T) with the following functionality: You can insert new elements (Key,T) into the current structure You can search for elements based on Key in the current structure You can make a "snapshot" of the current version of the structure You can switch to one of the versions of the structures which you took the snapshot
我需要一个类似地图的数据结构（在C ++中）用于存储具有以下功能的对（Key，T）： 您可以将新元素（Key，T）插入到当前结构中 您可以在当前结构中基于Key搜索元素 您可以制作当前版本结构的“快照” 您可以切换到您拍摄快照的结构版本之一，并从那里继续进行所有操作 完全删除其中的一个版本 我不需要的 元素从结构中移除 将不同版本的结构合并为一个 迭代当前存储在结构中的所有（或部分）元素 换句话说，你
-----------MyChatROOM.pro-------------------------------- QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets TARGET = MyChatROOM TEMPLATE = app LIBS += -lwsock32 SOURCES += main.cpp mainwindow.cpp HEADERS += mainwindow.h FORMS += mainwindow.ui ------mainwindow.h---------------------- ifndef MAINWINDOW_H define MAINWINDOW_H include include "../ChatRoomServerr
----------- MyChatROOM.pro -------------------------------- QT + =核心GUI greaterThan（QT_MAJOR_VERSION，4）：QT + =小部件 TARGET = MyChatROOM TEMPLATE = app LIBS + = -lwsock32 SOURCES + = main.cpp mainwindow.cpp HEADERS + = mainwindow.h FORMS + = mainwindow.ui ------ mainwindow.h ---------------------- ifndef MAINWINDOW_H 定义MAINWINDOW_H 包括 包括“../ChatRoomServerr.h”