C++ - Страница 1249

I am trying to reduce the run-time of this code as much as possible. I have never done parallelization in C++. I would appreciate your help in figuring this out. I can run the code on VSCode or CodeLite on a 64-bit Windows machine.

#include...

I'm using thrust to deal with GPU arrays. Here is a toy code to demonstrate the problem:

$ cat ss.cu #include #include #include #include struct A { float p; A(float p) : p(p) {} template __host__ __device__ void func(T& con) { /// complie error...

I have a spinbox with a default 0 in it. After I click on the spinbox the cursor needs to move after the 0 inside the box. The function bellow is not producing any suitable result.

void CSpinBoxExtra::mousePressEvent(QMouseEvent *event) { if(this...

I attempted to run my MakeFile generated with cmake but ran into the following error:

error: no member named 'par' in namespace 'std::execution' std::execution::par, ~~~~~~~~~~~~~~~~^ 2 warnings and 1 error generated. make : *** Error 1 make :...

I am trying to set up VS Code as a C/C++ development environment using gcc/g++ installed from homebrew on my MacBook.

It all works fine. When I run a file, it finds gcc which I installed with homebrew . However, the output is shown in the debug...

Consider the definition of compare_and_exchange_strong_explicit :

_Bool atomic_compare_exchange_strong_explicit( volatile A* obj, C* expected, C desired, memory_order succ, memory_order fail ); I'm confused by the use-case of memory_order fail ....

I am using boost asio to connect to a TCP Server. When I run the code it works fine after start. I send the request and get the response. When I turn off the tcp server (it is a device) I am running into timeout and callback inside async_read from...

So I was trying to learn Pybind11 with a simple project, but like always, something went wrong and I ran into this error when trying to import the module itself though the Python Shell or File.

ImportError: DLL load failed while importing...

Building a simple program that multiplies the ASCII value of chars in a string by 3 to encrypt and then divide by 3 to decrypt. So far I got the encryption part down but whenever I enter what the encryption gave and try to decrypt it doesn't work. I...

Can I use a map or hashmap in a multithreaded program without needing a lock? i.e. are they thread safe?

I'm wanting to potentially add and delete from the map at the same time.

There seems to be a lot of conflicting information out there.

By...

Here is a C++ example.

Each 7 seconds, CancelIoEx() is called and user needs to fill in the content twice (by hit Enter key twice) to trigger getline().

I guess something in Windows Console may not be canceled by CancelIoEx() properly can cause...

I have two snippets:

for (int i = 0; i 0 && arr 0 && arr

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I use Android stduio to build my applications. Howevert, recently, when i build apk, the as give me and error the process cannot access the file because it is being used by another process , sometimes the build is ok, sometimes it has this problem....

For the SSL communication with the certificate for the below C/C++ code link how to support the CA certificate (public key certificate which is exported from the site info)

HttpClientWithSslAndClientCert

WS_SSL_TRANSPORT_SECURITY_BINDING...

Can I just write

mt19937 generator; int val = (int)generator(); // unsigned to int instead
mt19937 generator; uniform_int_distribution dist(numeric_limits::min(), numeric_limits::max()); int val = dist(generator_);

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I'm trying to create an Android game controller to make a Super Mario clone, just to learn programming and practice:

The next problem stopped me. I touch the screen with my first finger. While holding the first finger, I touch and release...

I have the following code:

#include #include auto func(const char* Str) { return std::string_view(Str) | std::views::split(',') | std::views::transform([](auto inp) { return inp.data(); }) | std::ranges::to(); } Note I know that the result of...

I'm getting this exception exception description when I use this line of code svm->train(X, cv::ml::ROW_SAMPLE, labels);

and this is the stacktrace:

svm&ssd_car_detector.exe!invoke_main() Line 78 C++

in this function:

cv::Ptr...

I'm encountering an issue where a template function uses std::invoke to call another function, passing a size_t argument to a parameter expecting an int32_t. This should, theoretically, trigger a warning about type conversion. However, when...

Recently I met a C2908 error:

explicit specialization xxx has already been instantiated

The reason is that, for our MyClient class, we have the operator less specifically defined as to compare using the member property ClientSerialNumber; after...

I have a simple function that checks if a value is bigger than one third:

bool check(float x) { return x > 1.f/3; } Based on what I've read, the compilers will probably calculate the result of 1.f/3 at compile time to improve performance, but is...

I have a text file that has n records and each record consists of 7 values. I also have 3D matrix where each item in this matrix is one of those records. I want to iterate over this matrix and get for each item its record index from the text file....

I'm getting a SonarQube S3519 warning on all kinds of completely ordinary std::sort() calls:

typedef std::vector MyVector; MyVector transactionList; transactionList.clear(); sort(transactionList.begin(), transactionList.end()); The Sonar's...

i have an Rpm sensor (variable reluctance time) this sensor creates voltage pulses, the build up and later rise down many times a second. I need to read the tops of these pulses and the time inbetween or how many happen in a certain time span to...

I am trying to understand a C++ OpenGL project (github/XCSoar) using VSCode on a Debian Linux box (don't think that is significant, but...). I have noticed that the 'active/inactive' code block highlighting is wrong sometimes, and it really screws...