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[[File:CSet++ logo.jpg|thumb|right|C Set++ v2.01 for OS/2, the first release of IOC/OCL/IUICL]]

'''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 [[command line interface|CLI]] and [[GUI]] applications which could then be easily [[cross compiler|cross-compiled]] to [[OS/2]], [[Microsoft Windows]], and [[AIX operating system|AIX]]. IOC also formed the basis for IBM's [[VisualAge|VisualAge for C++]] graphical application builder. The non-GUI portions of IOC were available for [[z/OS]] and [[OS/400]].

== History of IOC ==
[[File:IUICL v2.01 poster.jpg|thumb|right|Promotional poster from 1993 showing parts of the class hierarchy for the IUICL v2.01]]

The IOC was included as part of IBM's C++ [[compiler]] environment. Applications developed with IOC could be distributed with a [[royalty-free]] [[runtime library|runtime]], or could be [[static library|statically linked]] against the IOC [[software library|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 Support for the OS/2 and Windows VisualAge for C++ compiler—as well as the accompanying IOC—was officially withdrawn by IBM on April 27, 2001.{{ref|ibmwithdrawal}} IOC was removed from z/OS 1.9, introduced in 2007.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 4.0|Windows NT, version 4.0]] (1998)

== Examples ==
The most widely recognized example of a simple application that uses the IOC is [[hello world program|hello world]]:

#include <iframe.hpp>
<syntaxhighlight lang="cpp">
int main()
{
IFrameWindow frame ("Hello, World!");
frame.showModally();
}
</syntaxhighlight>
Other examples of commonly used IOC classes and methods include:

#include <istring.hpp>
<syntaxhighlight lang="cpp">
IString someText ("hello world");
</syntaxhighlight>

#include <icmdhdr.hpp>
<syntaxhighlight lang="cpp">
virtual Boolean MyHandler::command (ICommandEvent &event);
</syntaxhighlight>

==Notes==
#{{Note|ibmwithdrawal}} [http://www.ibm.com/Search/?q=901-013 IBM's Withdrawal Announcement #901-013] (announced on January 23, 2001, effective on April 27, 2001)

==External links==
*news://ibm.software.vacpp.openclass
*{{ISBN|0-442-01795-2}} (C++ Class Library: Power GUI Programming with CSet++)
*{{ISBN|0-471-16482-8}} (Power GUI Programming with VisualAge for C++)

{{DEFAULTSORT:Ibm Open Class}}
[[Category:IBM software|Open Class]]
[[Category:OS/2 software]]
[[Category:Windows software]]
[[Category:1993 software]]
[[Category:C++ libraries]]

{{Compu-lang-stub}}

IBM Open Class - Revision history

imported>Akira625: Added links, removed dead links.