IBM Open Class (IOC) is an IBM C++ product originally developed by Kevin Leong and originally known under several names in the C++ industry, including ICL (IBM Class Library), UICL (User Interface Class Library), and OCL (Open Class Library). IOC was an extensive set of C++ classes used to build CLI and GUI applications which could then be easily cross-compiled to OS/2, Microsoft Windows, and AIX. IOC also formed the basis for IBM's VisualAge for C++ graphical application builder. The non-GUI portions of IOC were available for z/OS and OS/400. History of IOC The IOC was included as part of IBM's C++ compiler environment. Applications developed with IOC could be distributed with a royalty-free runtime, or could be statically linked against the IOC libraries. Initially only available for OS/2, the IOC was eventually made available for Windows, AIX, z/OS, and OS/400. Support for the OS/2 and Windows VisualAge for C++ compiler—as well as the accompanying IOC—was officially withdrawn by IBM on April 27, 2001. IOC was removed from z/OS 1.9, introduced in 2007. C/Set++ v2.01 for OS/2 (1993) VisualAge C++ for OS/2, version 3.0 VisualAge for C++ for Windows, version 3.5 C and C++ Compilers for OS/2, AIX, and for Windows NT, version 3.6 C and C++ Compilers for OS/2 and Windows, version 3.65 (1998?) VisualAge C++ Professional for OS/2 and Windows NT, version 4.0 (1998) Examples The most widely recognized example of a simple application that uses the IOC is hello world: #include <iframe.hpp> int main() { IFrameWindow frame ("Hello, World!"); frame.showModally(); } Other examples of commonly used IOC classes and methods include: #include <istring.hpp> IString someText ("hello world"); #include <icmdhdr.hpp> virtual Boolean MyHandler::command (ICommandEvent &event); Notes IBM's Withdrawal Announcement #901-013 (announced on January 23, 2001, effective on April 27, 2001) External links news://ibm.software.vacpp.openclass (C++ Class Library: Power GUI Programming with CSet++) (Power GUI Programming with VisualAge for C++) Open Class OS/2 software Windows software 1993 software C++ libraries