Operations in IDL Interface Definitions

• IDL operations define the format of functions, methods, or operations that clients use to access the functionality of an object.
• An IDL operation can take parameters and return a value, using any of the available IDL data types.
• For example, the Account interface defines the operations makeDeposit and makeWithdrawal as follows:

  
       module Finance { 
         interface Account { 
           // Operations available on the account. 
           void makeDeposit(in float amount, 
                            out float newBalance); 
           void makeWithdrawal(in float amount, 
           out float newBalance); 
           ... 
         }; 
       }; 
  

• Each parameter definition must specify the direction in which the parameter value is passed.

  The possible parameter passing modes are as follows:

  in	The parameter is passed from the caller
  	of the operation to the object.
  out	The parameter is passed from the object to the caller.
  inout	The parameter is passed in both directions.