A SOM IDL interface statement for a class may contain an implementation statement, which specifies information about how the class will be implemented (version numbers for the class, overriding of inherited methods, what resolution mechanisms the bindings for a particular method will support, and so forth). If the implementation statement is omitted, default information is assumed.
Because the implementation statement is specific to SOM IDL (and is not part of the CORBA standard), the implementation statement should be preceded by an "#ifdef _ _SOMIDL_ _" directive and followed by an "#endif" directive. (See Example 3 in the SOM IDL Tutorial presented earlier.)
The syntax for the implementation statement is as follows:
#ifdef __SOMIDL__
implementation
{
implementation*
};
#endif
where each "implementation" can be a modifier statement, a passthru statement, or a declarator of an instance variable, terminated by a semicolon. These constructs are described below. An interface statement may not contain multiple implementation statements.