13.1.17 Implementing Interfaces

An operation in OMG IDL is mapped to a C++ member function.

The name of the member function is the name of the operation. The operation is defined as a member function in both the interface class and the stub class. The interface class is virtual; the stub class inherits from the virtual class and contains the member function code from the client application stub. When an operation is invoked on the object reference, the code contained in the corresponding stub member function executes.

For example, consider the following OMG IDL definition:

// OMG IDL
module INVENT
    {
    interface Order
       {
       . . .
       ItemList modifyOrder (in ItemList ModifyList);
       };
};

This definition maps to C++ as follows:

// C++
class INVENT
    {
    . . .
class Order : public virtual CORBA::Object
   {
   . . .
   virtual ItemList * modifyOrder (
       const ItemList & ModifyList) = 0;
   };
};
class Stub_Order : public Order
    {
    . . .
    ItemList * modifyOrder (
        const ItemList & ModifyList);
};

The generated client application stub then contains the following generated code for the stub class:

// ROUTINE NAME:   INVENT::Stub_Order::modifyOrder
//
// FUNCTIONAL DESCRIPTION:
//
// Client application stub routine for operation
// modifyOrder.
// (Interface : Order)

INVENT::ItemList * INVENT::Stub_Order::modifyOrder (
      const INVENT::ItemList & ModifyList)
{
. . .
}

• Argument Mapping