Category "c++"

I need a function to delete certain characters from a char array in c++ without using any index

for example: if the user enters : ( 23+22+43) I want the function to do exactly the following : for(int i =0; i <strlen(x);i ++) { if (x[i]=='+') {

How to open GStreamer pipeline in OpenCV

I'm a software engineer in South Korea. I'm trying to open webm video using GStreamer pipeline in opencv program But I can't find any solution to figure out it.

Use templates to implement a subset of multiple virtual methods of a templated class

I am working on incorporating a new implementation based on an older, fixed API and moving in somewhat contradicting terrain because I need to pair a templated

My checkTie() function is not working correctly

I am working on my college project where we have to create a Tic-Tac-Toe game and I am completely made the game but for some reason, my checkTie() function is n

find_package() ignores <PackageName>_ROOT

In my CMake script I append the path to a folder containing <PackageName>Config.cmake to <PackageName>_ROOT and then call find_package(<PackageNa

QSqlDatabase is opened but QSqlQuery does not execute and shows error database not opened

I am working on a project. I am trying to run this query but it fails and gives the error. Here is the code: QSqlQuery* printQry = new QSqlQuery(); if

Automatic differentiation using expression templates c++

Introduction I am trying to learn about expression templates because it seems to be a very powerful technique for a wide range of calculations. I looked at diff

cmake : shared library or sub-prjoect

I am builfing a new c++ project and i want to integrate cmake and i dont know what is the best approach i have to follow my project tree looks like this : .

How come the fmt library is not header-only?

I know it is possible to use the fmt formatting library in header-only mode: How to use fmt library in the header-only mode? but - why isn't it just header-only

What is differnece between CreateWindowEx, CreateWindowExA, CreateWindowExW?

I read the documentation about CreateWindowEx CreateWindowExA CreateWindowExW and they all are seem to be identical to each other. if there is not difference w

Trying to run a cpp program but I get the following error: [process exited with code 3221226356 (0xc0000374)]

I am currently trying to execute the following cpp program on Windows: #include <cstdlib> #include <iostream> #include "math.h" #include <fstream

Drawing with cv::circle's over a line Iterator in c++ with openCV

I'm creating an iterator line, which I pass through a for() and draw with cv::circle points. So far so good, form a line drawing, by the iterator's line points.

How to shuffle a std::vector?

I am looking for a generic, reusable way to shuffle a std::vector in C++. This is how I currently do it, but I think it's not very efficient because it needs an

Does vector know to reserve first when initializing by a pair of iterators?

Consider the following code. struct MyData{ MyData(const BYTE* pData, size_t uSize) : bucket_(pData, pData + uSize) {} std::vector&l

GetCommTimeouts function failed with error code 50

when I develop a PCIe communication interface, I used CreateFile & Readfile function to operate the device. But when I tried to set timeout to the handle, I

static_assert expression is not an integral constant expression with __builtin_clz

I have the following code: typedef unsigned char uchar; constexpr int leaing_ones(uchar const u8) noexcept { return __builtin_clz(static_cast<uchar>(~s

How to handle "java.lang.UnsatisfiedLinkError" when the library path is satisfied?

I'm trying to export a c++ library function through JNI, I've this header file called "Pylon.h" here's the source code: /* DO NOT EDIT THIS FILE - it is machine

My segment tree update function doesn't work properly

The problem: In this task, you need to write a regular segment tree for the sum. Input The first line contains two integers n and m (1≤n,m≤100000), the s

If MinGW-w64 doesn't support wWinMain, then what C++ compiler should I use instead? [duplicate]

I've been attempting to follow this guide here for writing a program in C++ that allows me to create an application window, however I ran into

'base/debug/debugging_buildflags.h' file not found when building project with webrtc

I am building a project that includes webrtc with CMake, Visual Studio 2019 and ClangCl. This is the command I run to configure : cmake -G "Visual Studio 16 20