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03/03/2025

Daylight

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The size of a variable does not match the size of its type
03/06/2025 by Javier García
I am making a check before a memcpy to ensure that the size of an input templated variable "value" is the same than the size of its expected datatype, that I have stored previously. The checking code looks more or less like this, it is part of a bigger program, […]
Is it bad to assign a const value inside a constructor?
03/06/2025 by Balfar
I am using a particular pattern that appears often in one of my programs, and I can't see if I am doing a bad code architecture or if it is a good thing to do. Let's imagine that we have a Class A, defined as follows: template struct DataProcessor { […]
Docker container passing arguments to C++ script
03/06/2025 by Jan
so I want to pass custom arguments to my Docker container, it all works fine with the arguments in general, just this snippet in main.cpp never gets executed: int main(int argc, char* argv[]) { ifstream configFile("dbrex/config/args.json"); if (!configFile && argc == 1) { cout
Why in C when I print a int with the format of float it returns 0.00?
03/06/2025 by Jorge
float res = 4 -5; float add = 5 + 4; float mult = 5*4; float div = 40/5; float mod = 5%4; int num1 =5, num2 = 5; num1--; num2--; int num3 = 7; printf("%f\n",res); printf("%f\n",add); printf("%f\n",mult); printf("%f\n",div); printf("%f\n",mod); printf("%f\n",num1); printf("%d\n",num2); printf("%f",num3); It retrurns: -1.000000 9.000000 20.000000 8.000000 1.000000 […]
How to initialize video decoder with a already decoded frame?
03/06/2025 by Ragdoll Car
Let's say I have an FFmpeg video decoder x264 initially initialized with some parameters. I am using C++ in my scenario. In normal conditions we push an encoded I-frame into such decoder and then referencing encoded P-frames. I have a special case where my I-frame is already decoded. So in […]
How to load QByteArray to RAM and access it as .db file
03/06/2025 by Саня Радченко
Now I'm currently developing a password manager program. I have some encrypted .db file, after decrypting it as QByteArray I want to save it somewhere in RAM so I don't create temporary files. After it I need to load it to QSqlDatabase. I have tried this: QFile *f; f = […]
How I must change in my code for setDynamicSortFilter it would work? [closed]
03/06/2025 by topaz23
I have next code, but my model does't update dynamic,where I wrong? QSortFilterProxyModel proxyModel; proxyModel.setSourceModel(&m_myModel); tableView->setModel(&proxyModel); tableView->setSortingEnabled(true); proxyModel.setDynamicSortFilter(true); my cut code
How to print or format a std::filesystem::path?
03/06/2025 by user2138149
I'm trying to write the following C++ function, however I cannot figure out how to format a std::filesystem::path object. const auto load_test_file(std::filesystem::path filename) { std::ifstream ifile(filename, std::ios::in | std::ios::binary); if(!ifile.is_open()) { const auto error_message = std::format("failed to open file {}", filename.string()); throw std::runtime_error(error_message.c_str()); } // do some stuff here } […]
Why const int don't works while const* int works in overloaded function? [duplicate]
03/06/2025 by ABISHEK NS
void func(int num); void func(const int num); int num = 10; func(num); Gives Error Output: redefinition of void func(int) But, when passed as pointers to the overloaded function, it works, void func(int* num); void func(const int* num); int num = 10; func(&num); // calls func(int* num) How's that?
std::numeric_limits<std::size_t>::max() to std::streampos
03/06/2025 by no one special
both msvc and gcc interpret the following code in the same way. The std::streampos can be constructed only from std::streamoff, while the std::streamoff is signed. So Both compilers interpret max value of size_t as -1. It is clear for me why, but how to walkaround this? Also, isn't that a […]

Category: Light

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