C++ - Страница 1256

I wrote the following code which doesn't provoke any error:

main.cpp

#include main_window.hpp #include int main(int argc, char *argv[]) { QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); } main_window.hpp

#pragma once...

When i run the main function and attempt to get a definition from a dict server only the first line is returned.

main.cpp

#include #include #include dictclient/dictclient.hpp int main(int argc, char *argv[]){ if(!(argc slen) && (c>0) && (s !=...

I'm trying to send messages via async_write, but they are only sent after I shutdown the server ( ctrl-c)

For example: as client I send test and test2 , and only after closing the server client recieves testtest2

I'm making a chat that accepts...

My team has encountered a deadlock that I suspect is a bug in the Windows implementation of SRW locks. The code below is a distilled version of real code. Here's the summary:
Main thread acquires exclusive lock Main thread creates N children...

I have queue with objects, which are executed sequentially. There is no operating system, I'm just using the hardware and my code:

while(true) { if( next = queue.next() ) { next->do_stuff() } } Now I want to suspend the code which is executed at...

Is it better to use std::memcpy() as shown below, or is it better to use std::copy() in terms to performance? Why?
char *bits = NULL; ... bits = new (std::nothrow) char[((int *) copyMe->bits) ]; if (bits == NULL) { cout bits, ((int *) copyMe->bits)...

I am trying to make a simple tool that requires some lookup on a fixed key-value dataset, so I try to lazily throw all data to a hashmap in the header file:

/** main.h */ #include #include using namespace std; const unordered_map test = {...

I am using mellanox Connectx6, dpdk 22

'MT2892 Family 101d' if=ens5f1 drv=mlx5_core unused=igb_uio

I configure port with multiqueue and split traffic according to ip+port

I want to calculate the hash as the nic do, to be able to load balance...

Product pair- link to the question

initially i hadn't added the abs stuff but after i did, the code was able to handle some of the negative test-cases but not all of them

i have an idea as to why this might be still showing errors even after...

this is my code. I'm new to c++

#include class Human { public: std::string gender; class Foo : public Human { public: std::string name; Foo(std::string gender, std::string name) { this->gender = gender; this->name = name; } }; }; int main(void) {...

I am learning about gameloops in c++ and I have created code that can make movement (of a rectangle) independent of the fps.

Like so:

delta_time = (SDL_GetTicks64() - last_frame_time); last_frame_time = SDL_GetTicks64(); int player_speed = 1; //...

I have several pc connected to one network.

When I trying to write file with WriteFile function across network from several processes running on the different PC-s I getting ERROR_UNEXP_NET_ERR.

Details: Several PC-s does they own calculations...

Could you C++ developers please give us a good description of what RAII is, why it is important, and whether or not it might have any relevance to other languages?

I do know a little bit. I believe it stands for Resource Acquisition is...

Question
Two friends Niya and Druva visited a math’s magic zone. They had decided to play a puzzle game that asked them to alternate the order of Negative numbers and perfect square numbers. By using a quick sort algorithm and some rearranging...

In class A, I define a class B. I want to hide the implementation of class B. The class B inherits from QObject.

// a.h class A : public QObject { Q_OBJECT public: explicit A(QObjcet* parent=nullptr); private: class B; QSharedPointer m_impl; };...

I have just stumbled over C++20's concepts , something that I've wanted in the language for years... well kind of.

Consider the code below:

#include #include template concept IFoo = requires(T t) { { t.foo() } -> std::convertible_to; }; class...

I wrote a namespace for linear algebra in C++, in which I have defined a class for Matrix. While overloading operators, I am getting a no match error for operator>> . I have declared the input operator as friend in the matrix class.

I have...

I have a problem processing packets from the COM port. This port reads at a speed of 115200. A lot of data from this port is lost. The buffer overflows almost immediately. In the code I attach, I try to remove the overprocessed buffer on the fly....

I added some pushbuttons and deleted the menu bar and toolbar in the main window.

After running, I found that if I resize, the window scroll-bars don't appear.

I don't want the pushbuttons to resize or move. I am fine with them...

Our class was challenged by a professor at uni that if we were able to find a algorithm that fittingly describes the following Big-O-Notation, we'd instantly pass his class. I wanted to ask if any of you know how this could be done since I've been...

I'm designing and programming an elevator-like robot for a high school project. Could I possibly do anything to make this any simpler? Or better? I have attached a picture of my design that I made in AutoCAD Inventor with labels.

For those...

I have to dynamically create push buttons depending on user inputs, therefore if the user gives a large input number, the widget containing the push buttons has to have the ability to scroll up and down.

For this reason, I am using QScrollArea. I...

I am trying to attach a servo on an Arduino (branded) Robot but not sure whhich pin to use for the bellow code. Most people seem to recommend to use pin 9 and 10 to control the servo for arduino Unos. However, I can't use Pin 9 because that is...

Everything works perfectly fine but the thing is that everytime a user creates an account, it replaces the old credentials stored in the already existing file. I want to be able to store multiple user credentials so that multiple users can login....

Processing large amounts of data (gigabytes) I use indexes to data arrays. Since access to data could lead to cache inefficiency, I want to cache some data from array together with the index which gives dramatic speedup for operations through...