Recent questions tagged C++

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c++ - What is the need to generate ASM code in gcc, g++

To narrow down my question, let me describe my assumption and the experiment that I did... My assumption: A ... of speed and program size? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - how to rotate all objects by their own centers and then translate them to the real position (it isn't working)

What is the way to make all the objects that are not aligned with the origin center (vector3(0.0f,0.0f,0. ... glm (to matrix manage) and OpenGL. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to get QIODevice-like signals for console input (stdin)?

I'm writing console app, based QCoreApplication, and I want to get signals, when user input something into ... also with with QSocketNotfier? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Reverse every word in a string (should handle space)

Examples: char test1[] = " "; char test2[] = " hello z"; char test3[] = "hello world "; char test4[] ... cur_word_e); runner = cur_word_e+1; } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Xerces-C validate xml with hardcoded xsd

I'm writing a library which takes xml files and parses them. To prevent users from feeding inalid xmls ... containing the schema definition. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Cross compilation openCV application

Hi guys I am doing an application in c++ for ARM. I have a application prototype which I compiled with ... ,-z,now ${CMAKE_EXE_LINKER_FLAGS}") See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is it possible to define enumalpha?

I would like to be able to write: cout << enumalpha << Monday; and get printed on console: Monday P.S. Monday is an enum type. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is required for a custom BGL graph to work with topological sort?

I've created a custom BGL graph model, like in this answer: What is needed to use BGL algorithms on ... ::back_insert_iterator<std::__cxx11::list<YourLibrary::myVertex*> >;...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Ensure that char pointers always point to the same string literal

Given the code // somewhere in the program const char* p1 = "Hello World"; // somewhere else in the program const ... { setMapping("foo", x); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Superpowered: real time pitch shift with timestretcher not working

I am using Superpowered for various real-time FX and they all work very straightforward. However the pitch ... except the very first time See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - boost::spirit::qi permutation parser and synthesized attributes

I'm trying to put together a simple command line parser with SPIRIT without semantic actions. I'm using BOOST 1.52 ... false ); } return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Allegro in Ubuntu: undefined reference to `al_install_system'

I tried installing the Allegro library today. I have same experience in C++, but it seems I have none in doing ... but it didn'T work either. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - OpenCV : convert the pointer in memory to image

I have a grabber which can get the images and show them on the screen with the following code while((lastPicNr = ... me to use the image data? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Enum to string : return the enum integer value if invalid / not found

So, I implemented an enumToString function for several enums that I use a lot (often asked in SO: Is there a ... stack each time. Any solution? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Memory usage when using boost::iostreams::mapped_file

I am pasting some code here which uses boost iostream to mmap & then writes to the mapped file: typedef unordered_map ... 's the way it behaves? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - CUDA: In warp reduction and volatile keyword

After reading the question and its answer from the following LINK I still have a question remaining in my ... cause any performance degradation? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Syntax tree empty nodes issue with Spirit Qi MiniC example

Dear Spirit Qi experts. I have played around with the MiniC example in Spirit Qi, and have noticed an issue ... it recursively steps in there. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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338 views

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c++ - Gracefully terminate a Boost Asio based Windows console application

I am working on a boost.asio based HTTP server. It is supposed to be stopped externally. We use asio signal ... there a known approach to this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Friend function declaration/definition inside a namespace

Consider a class inside a namespace. The definition of the class declares a friend function. namespace Foo { ... flag eliminate the error? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - The application failed to initialize properly (0xc0150002)

I'm trying to compile an SFML program I've writting in Visual C++ 2010. It compiles fine, but when I run ... anyone know how I can change it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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212 views

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c++ - Take action after the main form is shown in a Qt desktop application

In Delphi I often made an OnAfterShow event for the main form. The standard OnShow() for the form would have ... available to me to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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692 views

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c++ - CImg: Failed to recognize the jpg format

#include <iostream> #include <stdlib.h> #include "CImg.h" using namespace cimg_library; using namespace std; int ... the error still happens. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - way of defining class in a namespace

I defined a class in a namespace in a header as follows #ifndef _c1_ #define _c1_ namespace classspace { class ... in the first approach? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to have template type deduced in std::function arguments with lambda?

I have a boost::variant and I would like to execute a functor only if the variant is of a special type, so I made ... std::endl; }); return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can I access multidimensional array using a pointer?

From this reference, In C it seems the following behavior is undefined. int my_array[100][50]; int *p = my_array ... C++11 which confirms this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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168 views

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c++ - Do I need to guard a variable that is written by one thread and read by many?

I am writing a data acquisition system. The system is both handling fast data from our signal digitizers, and ... variables in the structure? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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524 views

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c++ - Must construct a QApplication before a QWidget

Everywhere only just "before QPaintDevice" questions and nowhere is my error. So, here we go. I need an extern ... that seems strange to me. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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341 views

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c++ - why the release version memset is slower than debug version in visual studio 2012?

why the release version memset is slower than debug version in visual studio 2012? in visual sutido 2010, it is ... right, thank you very much. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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