Recent questions tagged c++

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c++ - Eliminate duplicate entries from C++11 variadic template arguments

I'm using variadic templates with multiple virtual inheritance in C++ to aggregate types into a single structure ... the type list? 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++ - Dominance in virtual inheritance

What are the C++98/C++03 standards' and the C++0x future standard's exact rules for dominance in ... , the standardese explained, clearly. 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 remove black part from the image?

I have stitched two images together using OpenCV functions and C++. Now I am facing a problem that the final ... I remove the black section? 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++ - Input line by line from an input file and tokenize using strtok() and the output into an output file

What I am trying to do is to input a file LINE BY LINE and tokenize and output into an output file.What I have ... //closes out file 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++ - How to edit/read pixel values in OpenCv from Mat variable?

I am looking for an efficient way for editing/reading pixels from Mat (or Mat3b) variable. I have used :- ... a portion of image is blackened. 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++ - Automatic Copy of Dependent Files in Qt Creator

I've build a program using Qt Creator 2.2.1 and Qt 4.7.4 (32 bit) whose output is an ... without using command line scripting? 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++ - Moving from sourceCpp to a package w/Rcpp

I currently have a .cpp file that I can compile using sourceCpp(). As expected the corresponding R function is ... exactly where my error is. 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 compile static library with -fPIC from boost.python

By default, libboostpython.a is compiled without -fPIC. But I have to make a python extension and it is a ... with -fPIC from boost.python? 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 ensure that virtual method calls get propagated all the way to the base class?

One very common mistake with class hierarchies is to specify a method in a base class as being virtual, ... What other possibilities are 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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c++ - Compare two files

I'm trying to write a function which compares the content of two files. I want it to return 1 if files are ... Thanks to everyone for the 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++ - Tutorial/Manual how to create Visualizer in autoexp.dat

I have some C++ datatypes for which I would like to improve the debugging experience in my team. I therefore ... know any good resource? 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++ - Is there a Qt solution for detecting USB events (insertion and removal)?

As some other people already asked here some years ago, I want to be able to detect in a Qt ... platform USB library?: Suggests libusbx 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++ - Template specialization to use default type if class member typedef does not exist

I'm trying to write code that uses a member typedef of a template argument, but want to supply a default ... be chosen in the above example? 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 streaming integers in any base

I can make an std::ostream object output integer numbers in hex, for example std::cout << std::hex << ... are they possible? Thanks in advance 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++ - Style sheets / Qt Designer support for high dpi screens?

Today I have ported my application from Qt5.5 to Qt5.6RC. Running it on my high dpi screen the widgets ... QT High DPI Support on Windows 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++ - Chaining asynchronous Lambdas with Boost.Asio?

I find myself writing code that basically looks like this: using boost::system::error_code; socket.async_connect( ... local and in-order? 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++ - STL containers on the stack and the heap

If std::vector and friends are self resizing, does that mean if I declare a vector like so: std::vector< ... ; Would resize using more heap? 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++ - asio::read with timeout

I need to know how to read (sync or async doesn't matters) with a timeout. I want to check if a ... solution that helps me solving 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++ - Why does a 2-stage command-line build with clang not generate a dSYM directory?

I have a simple project I want to debug want to produce dSYM folder with debugging symbols. Running: clang++ - ... when and why it is created. 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 drawMatches -- queryIdx and trainIdx

This is OpenCV's drawMatches() function: void drawMatches(Mat img1, vector<KeyPoint> keypoints1, Mat img2, vector< ... it the other way around? 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++ - _Block_Type_Is_Valid (pHead->nBlockUse) Error

I been working in a new project but I encounter with a problem which I can't see why fail. When ... pointers got copy without problems. 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++ - iterating over variadic template's type parameters

I have a function template like this: template <class ...A> do_something() { // i'd like to do something ... how to do this without recursion? 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++ - STL vector reserve() and copy()

Greetings, I am trying to perform a copy from one vector (vec1) to another vector (vec2) using the following 2 ... vec2.capacity() = 7 vec2: 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 parse an XML file with RapidXml

I have to parse an XML file in C++. I was researching and found the RapidXml library for this. I have doubts about ... in C++. Thanks!!! Ashd 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++ - Distributions and internal state

On Stackoverflow there are many questions about generating uniformly distributed integers from a-priory unknown ranges. ... a/30097323/3235496) 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++ - no override found for 'vtkPolyDataMapper'

I'm trying to use vtk in my code, but I'm having problems running an example. I have almost no clue about ... least what does this error mean? 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++ - Difference between struct and enum?

I am newbie to C++, and want to understand what is the difference between saying typedef enum ... over another ? Kind Regards 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++ - Conversion operator template specialization

Here's a largely academic exercise in understanding conversion operators, templates and template specializations. The ... was encountering. See Question&Answers more detail:os...

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

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