I am studying concepts in C++ 20, and came up with the need of defining a concept using a previous defined concept. So, in the example below I expected f<pub_b>() to generate a compiler error, since events_published in pub_b does…
I want to get accurate approximations of some complex functions (pow, exp, log, log2...) faster than ones provided by cmath in C++'s standard library. To do this I want to exploit the way the floating point is encoded and get…
I have following program: #include <cstdio> import animal; int main() { auto s = makeSound(); printf("%s", s.c_str()); return 0; } and module interface: module; #include <string> export module animal; import :sound; export std::string makeSound() { return makeSound_Impl(); } and module…
Create a new empty C++ Windows console application in Visual Studio 2022. Add a "main.cppm" file and populate it with this: import <sstream>; int main() { std::stringstream ss; ss << "Hey world!"; return 0; } It should compile and run…
In my C++ program I use std::source_location for log output. The printed path is currently absolute. The project is built with CMake. I want to shorten the std::source_location path according to the CMake variable CMAKE_SOURCE_DIR. How can I access CMAKE_SOURCE_DIR…
I'm using cmake version 3.22.1 and c++ (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 and a very minimalistic CMakeLists.txt I can't make CMAKE use C++20. Setting set(CMAKE_CXX_STANDARD 20) set(CMAKE_CXX_STANDARD_REQUIRED True) leads to no flag being present in the output. [ 50%] Building CXX object…
I've spend a lot of time trying to figure out an issue of compiling the solution for my studies using the cpp 20 modules in dynamic linked library. I've got my project structure as following: - Main soluition directory CMakeLists.txt…
I am creating an object file for my larger program. In this program I use a unique_ptr type with a custom deleter defined. So I'm compiling my file like so: g++ -std=c++20 tmp.cpp -c -Wall The code looks as follows:…
I was trying to compute an array in compilation time to speed up some functions while i encountered an error which I was unable to resolve with the help of cppreference. The code boils down to this: #include <cstddef> #include…
I am trying to use std::partition to partition a vector into multiple part based on whitespace. void solution2() { std::vector<string> v{ "10","20","","30","40","50","","60","70" }; auto i = begin(v); while (i != end(v)-1) { auto it = std::partition(i, end(v)-1, [](auto empty) {return…