Recent questions tagged C++

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c++ - Class with static members vs singleton

Isn't a class with only static members a kind of singleton design pattern? Is there any disadvantage of ... A detailed explanation would 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++ - OpenCV's fitEllipse() sometimes returns completely wrong ellipses

My goal is to recognize all the shapes present in an image. The idea is: Extract contours Fit each contour with ... , ellipses); 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++ - Extract Translation and Rotation from Fundamental Matrix

I am trying to retrieve translation and rotation vectors from a computed fundamental Matrix. I do ... img546/189/bildschirmfoto20130110uy.png 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++ - Converting a UINT32 value into a UINT8 array[4]

My question is how do you convert a UINT32 value to a UINT8 array[4] (C/C++) preferably in a manner ... to get back to where you started? 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 create delegate for QTreeWidget?

Here is what I'm trying to do (all parents and children must have a close button on the right, in ... about QItemDelegate's and similar stuff. 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 CMake generate a configure file?

I need the configure file to transpile from C++ to JS, I'm trying to use emscripten in a project. ... . but the configure file itself. 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 - IplImage

What is IplImage in OpenCV? Can you just explain what is meant by it as a type? When should we use it? Thanks. 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++ - gdb Could not find operator[]

double var1, var2; std::vector<double *> x; var1 = 1; var2 = 2; x.push_back(&var1); x.push_back(&var2); ... vector so I can access them in gdb? 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 copy char * into a string and vice-versa

If i pass a char * into a function. I want to then take that char * convert it to a std::string and ... see the changed value outside. thanks! 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++ - gcc and clang implicitly instantiate template arguments during operator overload resolution

Consider this code: struct A; // incomplete type template<class T> struct D { T d; }; template <class T> ... the first case but not the second? 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++ - operator std::string() const?

Can somebody tell me what precisely operator std::string() stands for? 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++ - Get list of methods in class using clang

In common IDEs (pick one) you often have an outline view showing you the list of methods for a specific class ... in advance for your 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++ - Capturing R6025 pure virtual call

I currently capture MiniDumps of unhandled exceptions using SetUnhandledExceptionFilter however at times I am getting "R6025: ... at that point. 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++ - Does standard C++11 guarantee that memory_order_seq_cst prevents StoreLoad reordering of non-atomic around an atomic?

Does standard C++11 guarantee that memory_order_seq_cst prevents StoreLoad reordering around an atomic operation ... same memory_order_seq_cst? 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++ - Parameter packs not expanded with '...'

I have this code: #include <iostream> using namespace std; int print(int i) { cout << endl << i; } ... use of the pass() function necessary? 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++ - Angle between 3 points?

Given points ABC, how could I find angle ABC? I'm making a feehand tool for a vector drawing application and to ... rs); return (int)rs; } 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 tell a std::priority_queue to refresh its ordering?

I have a priority queue of pointers to a struct city. I modify the objects pointed by these pointers outside the ... printed :( 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++ - boost log to print source code file name and line number

I'm using Boost(1.55.0) Logging in my C++ application. I have been able to generate log of this format [ ... "A regular message"; 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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174 views

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c++ - Is memory allocation in linux non-blocking?

I am curious to know if the allocating memory using a default new operator is a non-blocking operation. e.g. ... , but had trouble finding 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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c++ - What is the advantage of strand in boost asio?

Studying boost asio and find out a class called "strand", as far as I understand. If there are only one ... we want the tasks become serialized? See Question&Answers more detail:os...

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

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354 views

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c++ - how to change gcc compiler to c++11 on ubuntu

I use ubuntu 12.04 and the default gcc is 4.6.3. It is not accepting c++11 commands and is giving me ... gcc compiler that is c++11 compliant. 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++ - Create static array with variadic templates

There was an answer on stackoverflow (which I can't seem to find anymore) which demonstrated how a variadic ... with non-integral constants? See Question&Answers more detail:os...

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

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368 views

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c++ - What does "use -D_SCL_SECURE_NO_WARNINGS" mean?

I've got an error trying to compile my curve compression program, error no C4996, function call with parameters ... reference to it online... 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++ - Pointer to class member as template parameter

Is it possible to have non-type template parameter which is actually a pointer to a class member? What I'm ... if anyone has can say otherwise. See Question&Answers more detail:os...

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

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200 views

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c++ - Using auto in a lambda function

#include <vector> #include <algorithm> void foo( int ) { } int main() { std::vector< int > v( { 1,2 ... with the auto keyword doesn't work? See Question&Answers more detail:os...

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

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406 views

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c++ - Class member function pointer

I'm trying to use a class function (interrupt service routine), void (ClassName::*fp)(void)=ClassName::FunctionName; ... me it's not 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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202 views

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c++ - Possible to trap write to address (x86 - linux)

I want to be able to detect when a write to memory address occurs -- for example by setting a callback ... application causes gdb to crash). 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++ - Avoid ground collision with Bullet

I'm trying to use Bullet physic engine to create a 3D world. I've got my character with a Capsule shape on ... . How can I avoid the 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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