C++ - Страница 1259

I wrote the following code that has two lambdas. One of them explicitly captures i while the other doesn't. Note i is constexpr so we don't need to capture it explicitly.

My question is why func(lambda2) doesn't compile while func(lambda) does?...

I am trying to write a chrono::zoned_seconds object as text to a file and then retrieve it and construct another chrono::zoned_seconds object later. How can this be done in a fairly efficient way?

I don't think the code snippet below shows the...

I can send and receive data on different threads using the TCP protocol as demonstrated in the following code, how can I do the same using the UDP protocol?

#include #include #include using namespace std; // Function that receive data from client...

I am serializing a set of contents, indexed by multiple properties using boost::multi_index_container, and a params struct, into a binary archive which I want to deserialize latter. But the archive created using boost 1.74 is unreadable (Invalid or...

I have used the glfwgetwindowpos and glfwsetwindowpos with imgui's getmousedragdelta to try and move the parent glfw window using imgui. What I am trying to accomplish is to have an imgui window where I am able to drag on it, but rather than moving...

I am trying to introduce openMP to a code to speed up the loop. The loop processes some json inputs and generates json outputs. The json output contains almost exclusively doubles or vector or doubles. and We have some established expected results...

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...