Re: [LAD] "enhanced event port" LV2 extension proposal

/******* functions in IURIRegistryObserver_funcs are only implemented by the plugin when it wants notifications about new types ****************/ struct IURIRegistryObserver; struct IURIRegistryObserver_funcs { // function in a plugin called by host on new URI registration void (*mapping_added)(struct IURIRegistryObserver *observer, int id, const char *uri); }; struct IURIRegistryObserver { struct IURIRegistryObserver_funcs *functions; // plugin may place it in a larger structure, and cast a pointer }; /* functions implemented by host, used for mapping URIs and numbers */ struct IURIRegistry_funcs { // returns -1 if new registrations are not supported int (*uri_to_id)(struct IURIRegistry *registry, const char *uri, bool create_if_absent); // returns pointer to the URI (host-owned), or NULL const char *(*id_to_uri)(struct IURIRegistry *registry, int id); // might be a do-nothing if the host doesn't support registering uris on the fly void (*add_observer)(struct IURIRegistryObserver *observer); // might be a do-nothing if the host doesn't support registering uris on the fly void (*remove_observer)(struct IURIRegistryObserver *observer); }; /* structure returned by get_registry */ struct IURIRegistry { struct IURIRegistry_funcs *functions; // host may place it in a larger structure, and cast a pointer }; // structure on host side struct IURIRegistries_funcs { struct IURIRegistry *get_registry(const char *uri); }; // structure on host side struct IURIRegistries { IURIRegistries_funcs *functions; // host may place it in a larger structure, and cast a pointer }; Or to C++: class IURIRegistryObserver { virtual void mapping_added(int id, const char *uri) = 0; }; class IURIRegistry { virtual int uri_to_id(const char *uri, bool create_if_absent) = 0; virtual const char *id_to_uri(int id) = 0; virtual void add_observer(IURIRegistryObserver *observer) {} virtual remove_observer(IURIRegistryObserver *observer) {} }; class IURIRegistries { virtual IURIRegistry *get_registry(const char *registry_uri) = 0; };