YAZ++ is an application programming interface (API) to YAZ which supports the development of Z39.50/SRW/SRU client and server applications using C++. Like YAZ, it supports Z39.50-2003 (version 3) as well as SRW/SRU version 1.1 in both the client and server roles. YAZ++ includes an implementation of the ZOOM C++ binding and a generic client/server API based on the Observer/Observable design pattern.