How to implement guide with std::variant and std::visit not resolving overloads in c++20
I tried several approaches but none seem to work... I'm relatively new to this, so bear with me... I've been struggling with this for a few days now and could really use some help. I'm working with a frustrating situation when using `std::variant` in conjunction with `std::visit` in C++20. My intention is to apply different behaviors based on the active type of the variant, but I keep running into a compilation behavior related to overload resolution. Here's the relevant code snippet where the scenario arises: ```cpp #include <variant> #include <iostream> #include <string> struct HandlerA { void operator()(int value) const { std::cout << "HandlerA: " << value << '\n'; } }; struct HandlerB { void operator()(const std::string& str) const { std::cout << "HandlerB: " << str << '\n'; } }; int main() { std::variant<int, std::string> myVariant = "Hello"; std::visit(HandlerA{}, myVariant); // This line causes compilation behavior std::visit(HandlerB{}, myVariant); return 0; } ``` When I try to compile this code, I get the following behavior message: ``` behavior: no matching function for call to 'std::visit' ``` It seems like the compiler is unable to resolve the correct overload for `HandlerA` since the active type in `myVariant` is `std::string`. I've verified that both handlers are correctly defined and can handle their respective types. I've also checked that my compiler is fully compliant with C++20 standards. Can anyone guide to understand why this is happening? Is there a specific way to structure my `std::visit` calls or the handlers themselves that I might be missing? Any insights would be greatly appreciated! For context: I'm using Cpp on Windows. This is part of a larger service I'm building. What's the best practice here? I'd love to hear your thoughts on this.