Strange behavior when using std::optional with custom types in C++20
I'm deploying to production and I can't seem to get I've spent hours debugging this and I'm experiencing unexpected behavior when using `std::optional` with a custom type in C++20... I have a class `MyData` that holds some string data and I want to use `std::optional<MyData>` to represent a potentially empty state. However, when I try to access the value of the optional, I get an `std::bad_optional_access` exception even though I believe I've constructed it properly. Here's a simplified version of my code: ```cpp #include <iostream> #include <optional> #include <string> class MyData { public: MyData(const std::string &data) : data_(data) {} const std::string &getData() const { return data_; } private: std::string data_; }; int main() { std::optional<MyData> optData; optData = MyData("Hello, World!"); // Assigning value try { std::cout << optData->getData() << std::endl; // Accessing value } catch (const std::bad_optional_access &e) { std::cerr << "behavior: " << e.what() << std::endl; } return 0; } ``` I checked that `optData` is indeed assigned before I try to access it. However, the program throws an behavior on the line where I try to access `getData()`. I also tried using `optData.value()` and received the same exception. Could there be something wrong with how I'm initializing or assigning the `std::optional`? Is there a specific ordering or initialization requirement I might be missing? Any insights would be greatly appreciated! I'd love to hear your thoughts on this. This is for a CLI tool running on CentOS. Is there a simpler solution I'm overlooking? My team is using C++ for this service. What's the correct way to implement this? Thanks for your help in advance!