C++20 Design Is Complete: Modules, Coroutines in C++20(reddit.com)

    // Just copy paste this
    template<typename T>
    class CContainer {
    protected:
            T *pimpl;
            CContainer(T* raw_ptr): pimpl(raw_ptr) {}
        
    public:
            CContainer(const CContainer&) = delete;
            CContainer& operator=(const CContainer&) = delete;
            virtual const char* get_my_name() = 0;
            virtual ~CContainer() {};
    };

    // User
    class MyCHandler : public CContainer<c_struct>
    {
        public:
            MyCHandler(int arg) : CContainer(my_c_new(arg)) {}
            virtual const char* get_my_name() override {
                static const char[] kMyName = "MyC";
                return kMyName;
            }
            virtual ~MyCHandler() {
                my_c_destroy(pimpl);
            }
            std::unique_ptr<MyCHandler> clone() {
                return std::make_unique<MyCHandler>(my_c_clone(p_impl));
            }
    };