std::variant not selecting the correct type during runtime in C++20
I'm trying to implement I'm prototyping a solution and I'm stuck trying to I recently switched to I'm getting frustrated with I'm stuck on something that should probably be simple. I'm working with `std::variant` in C++20 to manage multiple types more efficiently, but I'm working with unexpected behavior when retrieving values. I defined a variant type for either an `int`, a `double`, or a `std::string`, and I'm trying to access the stored value based on some conditions. The question is that sometimes it seems to retrieve the wrong type, leading to the behavior: `bad_variant_access`. Here’s a simplified version of my code: ```cpp #include <variant> #include <iostream> #include <string> int main() { std::variant<int, double, std::string> myVar; myVar = "Hello"; // Assigning a string // Simulating some condition to access the value if (myVar.index() == 2) { // Checking if it's a string std::cout << std::get<std::string>(myVar) << std::endl; } else { std::cout << "Not a string!" << std::endl; } // Changing the value to double myVar = 3.14; // This check seems to unexpected result if (myVar.index() == 1) { std::cout << std::get<double>(myVar) << std::endl; } else { std::cout << "Not a double!" << std::endl; } } ``` In this scenario, the first condition seems to work fine, but the second condition always results in "Not a double!" even after assigning a double value. I’ve verified that the index should match, and I'm using `std::get` correctly. I've also ensured that I have the right includes and that my compiler is set to at least C++20. What could be causing the `std::variant` to report the wrong type? Am I missing something in how I'm setting or checking the indices? I'm working on a service that needs to handle this. Hoping someone can shed some light on this. I'm working with C++ in a Docker container on Debian. Any feedback is welcome! My development environment is Ubuntu 22.04. Is this even possible? Any advice would be much appreciated. My development environment is Windows 11. Is there a better approach?