std::string_view causing unexpected lifetime implementing dynamically allocated strings in C++
I'm trying to debug I'm sure I'm missing something obvious here, but I'm working on a project and hit a roadblock. I'm working with a question where using `std::string_view` with dynamically allocated strings is causing unexpected behavior in my application. Specifically, I'm attempting to use `std::string_view` to provide a lightweight reference to a dynamically allocated string, but I'm running into issues when the original string goes out of scope, leading to undefined behavior. Here's a simplified version of my code: ```cpp #include <iostream> #include <string_view> #include <memory> class StringHolder { public: StringHolder(const char* str) : str_(str) {} std::string_view getView() const { return std::string_view(str_.get()); } private: std::unique_ptr<char[]> str_; }; int main() { auto holder = std::make_unique<StringHolder>(new char[10]{'H', 'e', 'l', 'l', 'o', '\0'}); std::string_view view = holder->getView(); std::cout << "String view: " << view << std::endl; return 0; } ``` When I run this code, I don't see any errors immediately, but if I try to use `view` after `holder` goes out of scope, I get garbage output or sometimes a segmentation fault. I tried to ensure that `StringHolder` manages the lifetime of the string properly, but it seems that `std::string_view` is not holding a copy of the string, just a reference. I've also tried using `std::string` instead of `std::string_view` for a safer approach, but I want to avoid unnecessary allocations when I already know the string is managed elsewhere. Is there a way to use `std::string_view` safely in this context, or is it just not compatible with the way I'm managing the string memory? Any advice or best practices would be greatly appreciated. My development environment is macOS. Has anyone else encountered this? Any suggestions would be helpful. I'm using C++ 3.11 in this project.