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| OpenDoc > Library > Listing 2. Code snippets from the .cpp implementation file for KeyPadPart The complete OS/2 implementation for this class is available as part of a Redbook produced by IBM.
    SOM_Scope void  SOMLINK KPInitSemanticInterface(
                            KeyPadPart *somSelf,
                            Environment *ev)
    {
        ...
         _fSemtIntf      = new ODSemanticInterface();
         // ODSemanticInterface derives directly from
         // ODBaseSemanticInterface,
         // shown in Figure 1. above.  This call instantiates
         // the ODSemanticInterface extension.

         _fSemtIntf->InitSemanticInterface(ev, somSelf,
                                           _fSession);
         // This call initializes the ODSemanticInterface
         // extension.
        ...
    }
    ============================================================
    SOM_Scope ODBoolean  SOMLINK HasExtension(
                         KeyPadPart *somSelf,
                         Environment *ev,
                         ODType extensionName)
    {
    ...
        if (!strcmp(extensionName, kODExtSemanticInterface)) {
           // kODExtSemanticInterface is a constant defined
           // in the stdexts.xh header file

           return kODTrue;
        } else {
           // Check to see if the parent supports this extension
           return (KeyPadPart_parent_SimplePart_HasExtension(
                   somSelf,
                   ev,
                   extensionName));
        }
    }
    ============================================================
    SOM_Scope ODExtension*  SOMLINK AcquireExtension(
                                    KeyPadPart *somSelf,
                                    Environment *ev,
                                    ODType extensionName)
    {
       ...
       if(!strcmp(extensionName, kODExtSemanticInterface)) {
           return _fSemtIntf;
           // return the extension we instantiated when
           // KeyPadPart was initialized
       }
       ,,,
    }
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