Recent questions tagged C++

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c++ - Boost not Linking properly using CMake on Ubuntu

I've tried to make the code as simple as possible and I'm still getting undefined reference to `boost::log:: ... : *** [BoostTest] Error 2 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++ - Reliably using doubles as std::map keys

One of my coworkers recently brought up an interesting trick to reliably use floating point numbers as keys in something ... to reason it out. 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++ - Four digit random number without digit repetition

Is there any way you can have a 4 digit number without repetition - e.g. not 1130 but 1234? I read std:: ... < b.getNumber() << endl; } 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++ - custom stream manipulator for class

I am trying to write a simple audit class that takes input via operator << and writes the audit after ... Thanks for any input, Patrick 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++ - vector of pointer to object - how to avoid memory leak?

How do we ususaly deal with a vector whose elements are pointers to object? My specific question is the comment at the ... { delete l[i]; } } 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++ - error: incompatible types in assignment of 'long int (*)[4]' to 'long int [4][4]'

I am trying to build my own Matrix type which acts line an standard C matrix with multidimensional arrays. So ... { 0 }; initialization call? 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 calculate betweenness using boostlib for adjacency list?

I'm trying to write a simple program to calculate betweeness using brandes_betweenness_centrality from boostlib. I ... to output betweenness. 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++ - QApplication is lazy (or making other threads lazy in the app)

This is my first post here and I hope to find a solution to my problem. I have started developing an app ... ends. This solved my problem. 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++ - Templated usings Can't be Nested in Visual Studio

This is about as simplified as I could make a toy example that still hit the bug: struct Vector3f64 { double x; ... way I can work around 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++ - InetNtop: can't find which header it is using

Anyone knows what header I must include for the use of InetNtop function ? I tried winsock2.h, ws2tcpip.h and i've ... an IP what is in temp. 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 assertion failed

I am working on application for finding face in 2D image and later inside same image I want to find mouth, but ... . Thank You all for help! 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 count of cars in specific range

In veins i'm trying to simulate a VANET scenario in which if road is blocked then after specific time the car ... 'm looking in wrong direction? 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++ - Thread-safe vector: Is this implementation thread-safe?

I have a question regarding the term thread-safety. Let me give an example: #include <mutex> #include < ... (for example SERIAL execution). 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++ - Oriented Bounding Box is Misshapen and the Wrong Size in OpenGL

I'm writing a program in OpenGL to load a mesh and draw an oriented bounding box around said mesh. The mesh loads ... point8[2]); glEnd(); } 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++ - mach_header 64bit and __PAGEZERO segment 64bit

const struct mach_header *mach = _dyld_get_image_header(0); struct load_command *lc; struct segment_command_64 *sc64; ... why this occurs? 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++ - CodeBlocks error in graphics library

I executed the following code in codeblocks IDE- #include <iostream> #include <graphics.h> using namespace std ... included the WinBGIm library. See Question&Answers more detail:os...

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

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357 views

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c++ - Using IOCTL_MOUNTMGR_QUERY_POINTS

I am not able to know how to use the IOCTL_MOUNTMGR_QUERY_POINTS . I have searched the internet and found some ... )<<pMntPoints->MountPoints; } See Question&Answers more detail:os...

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

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571 views

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c++ - Linux draw pixel buffer

The problem is simple enough, i have a code that generates a pixel buffer. Now i need to present this pixel ... in window. Platform: Ubuntu 18 See Question&Answers more detail:os...

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

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317 views

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c++ - Why it seems not necessary to include some STL headers

I think some headers need to be included to compile with gcc(4.9), #include <algorithm> // for std:: ... including header files...Any hint? See Question&Answers more detail:os...

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

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721 views

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c++ - Adding opencv library to QT creator and getting error: linker command failed with exit code 1

i'm new to qt and i installed the qt creator on my mac (os 10.8.5) and wanted to add the openCv library. ... say and what could i've done wrong? See Question&Answers more detail:os...

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

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474 views

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c++ - Want transparent image even after blending

I am trying to blend two images as shown here. This is my whole code #include <cv.h> #include <highgui.h> ... output is only the face image. See Question&Answers more detail:os...

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

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343 views

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c++ - functions with const arguments Overloading ( Follow up)

This is a follow up of the Previous Question It got really complicated so I am starting a new thread to make my ... do it. but is this possible. See Question&Answers more detail:os...

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

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425 views

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c++ - QSettings::IniFormat values with "," returned as QStringList

I am using QSettings to parse an ini file: QSettings cfg(path, QSettings::IniFormat); When I obtain a value QVariant ... ( title=foo,bar ) ? 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++ - C++11 initializer_list constructor with header and cpp file for custom vector class

I'm doing a school project where I am to construct a custom vector class. And the class should be able to initialize vectors ... a = {1,2,3,4}; 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 can I rewrite this warp-affine using OpenCV?

I'm trying to optimize this code, in particular: bool interpolate(const Mat &im, float ofsx, float ofsy, float a11, float a12, float a21, float ... 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,...

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

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400 views

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c++ - /usr/../libstdc++.so.6: version `GLIBCXX_3.4.11' not found (required by ...)

I have been stuck on this problem for several weeks and been looking around on Internet for solution but so far not ... (such as "mexTrainDL"). See Question&Answers more detail:os...

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

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528 views

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c++ - assuming signed overflow does not occur in if statement

Why is this warning appearing? It's not really an assumption if I check the bounds. And how to fix? If ... count() - 2), action); See Question&Answers more detail:os...

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

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431 views

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c++ - OpenGL multiple rendering contexts in one window

Ok I have a program with a number of threads (loaded from DLLs at run-time). Each thread has a separate OpenGL ... gotten rather good at 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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