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C++ variant can't be assigned as implicitly deleted
09/11/2024 by CallumDoesStuff
Im trying to use a variant to be able to store and access two different classes, Node and Nbody, for a barnes Hutt algorithm. However, I get the error: error: object of type 'std::variant' cannot be assigned because its copy assignment operator is implicitly deleted Here is the header file […]
Casting const of types of std::pair held in std::vector when used to emulate std::map
09/11/2024 by Steven
I am implementing an associative container like std::map. Instead of using a red-black tree, I am using a std::vector. My use case is a data structure that has far more lookups then modifications, but implements the std::map API as close as possible, in order to improve cache performance. This concept […]
How to generate one tile for only z/x/y feom geotiff
09/11/2024 by aah134
I am having an issue when trying to generate slippy tiles, using gdal2tules which is great but take forever and may want a dry run for only one tile as a test, checking the output and so on, I dont like to generate a directory full of pictures/ tiles which […]
How is variable reassignment dealt with in code generation in compilers?
09/11/2024 by pedropiin
I'm trying to build my own compiler with C++ for my own basic programming language. In the beginning, I was following a series of YouTube videos from the channel Pixeled, but after a while I decided to stop watching them and try to continue the project on my own. Currently […]
std::cout makes SwiftUI crash
09/11/2024 by Tswalt
I'm making a "Hello World" app in C++ in Xcode and I call C++ from Swift via Objective-C++ bridge but whenever I use std::cout more than once it always crashes: main.cpp: #include #include int main() { std::cout
C++ for loop tests being incorrectly optimized out
09/11/2024 by Nathan S.
Inside the constructor for an overloaded, templated class, I have the following for loop. The original loop was more complicated, but I removed all the variables besides x that were doing useful computation during debugging to get a minimal example inside the larger structure. This is what is currently there: […]
Can I pass a mixed data type structure using MPI one-sided communication?
09/11/2024 by user27293694
In the following code I'm trying to pass a mixed data struct of a double and an int using MPI one-sided communication via MPI windows. This is all illustrated in the following. #include #include // ---------------------------------------------------------------------------- typedef struct { double a; int n; } STRUCT1; // ---------------------------------------------------------------------------- void deregister_mpi_type(MPI_Datatype type) […]
Branch coverage issues for spdlog in gcov
09/11/2024 by saravanan_1987
We are using spdlog in our code and generating coverage reports for our .cpp files. It appears that gcov is reporting some lines as partially covered: Line 1: SPDLOG_INFO( "{} Config {}", std::string(20, '='), std::string(20, '=') ); shows branchesToCover="8" coveredBranches="4" Line 2: SPDLOG_INFO( "Username: {}", username ); shows branchesToCover="4" coveredBranches="2" […]
The program should print random outputs, but in VSCode it is giving me the same output, why? [duplicate]
09/11/2024 by Piyush
I used the below code trying to get different outputs, but it is giving me the same output again and again. When I tried it in C, it gives me different outputs each time, so why not in C++? #include using namespace std; int main() { int marks; cout
When to use void and non void return types [duplicate]
09/11/2024 by hamza
I'm having trouble understanding when to use void and int return types in my C++ code. I know that void is used when a function doesn't return anything, and int is used when it returns an integer. However, I'm still unsure about how to determine when a function should return […]

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