Pure CORBA

IDL Mapping for Some Complex Types (Example 2)

The IDL features introduced in Example 2 are discussed further in the following subsections:

• The struct type

• The unbounded sequence type

• Java Holder and Helper types

The struct Type

The mapping of an IDL struct to C++ and Java is shown in Table 2.7.

Table 2.7. Mapping for the struct Type

OMG IDL	C++	Java
struct Foo {...};	struct Foo {...}; class Foo_var	class Foo {...} class FooHelper class FooHolder

An IDL struct has a very similar syntax to a struct in the C programming language. For example

//IDL
module BookRepository {
    struct Date {
        short day;
        short month;
        short year;
    };
};

defines a BookRepository::Date struct having three members: day, month, and year. The Date type can be used as a parameter or return ...