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Undefined reference when when linking dll
03/06/2025 by pwn01
Here is the code for my app: #include #include #include int main() { sql::Driver *driver; sql::Connection *con; driver = sql::mariadb::get_driver_instance(); return 0; } Here is the cmake file: cmake_minimum_required (VERSION 3.3) set(CMAKE_C_COMPILER "gcc") set(CMAKE_CXX_COMPILER "g++") set(CMAKE_CXX_STANDARD 11) project ("c:/dukexmlscript/sqltest/SQLTest") add_executable(SQLTest sqltest.cpp) add_library(mariadbcpp SHARED IMPORTED GLOBAL) set_property(TARGET mariadbcpp PROPERTY IMPORTED_IMPLIB "C:/Program […]
How to implement c++ game [closed]
03/06/2025 by Pizi
I need some help with a question. In its most simple version, it's a life game in C++. We have a main class, Bunny, which is an abstract class, and 2 classes that extend it, FemaleBunny and MaleBunny. A bunny has the following attributes (age, name, gender, and cords (x,y) […]
The size of a variable does not match the size of its type [closed]
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
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?

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