class Link { public: typedef some_internal_identifier _sc_seq; }; // Other members here in Software

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class Link { public: typedef some_internal_identifier _sc_seq; }; // Other members here
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The generated class defines the type name _sc_seq to give a name to the otherwise anonymous type In general, if a union u contains a member mem of anonymous type, the type of mem has the name u::_mem_seq You can use this type name to correctly activate the recursive member of a union:
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Link::_sc_seq myseq; Link mylink; mylinksc(myseq); // myseq is empty // uninitialized union // activate sc
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The same mapping rule applies to recursive structures If a structure s contains an anonymous sequence member mem, the type of mem is s::_mem_seq
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618 Mapping for Type Definitions
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IDL type definitions map to corresponding type definitions at the C++ level If a single IDL type results in multiple C++ types, each C++ type has a corresponding type definition Aliasing of type definitions is preserved If function declarations are affected by aliasing, a corresponding function using the alias name is defined (usually as an inline function):
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typedef string typedef StrArray StrArray[4]; Address;
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This definition maps as follows:
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typedef CORBA::String_mgr typedef CORBA::String_mgr StrArray_slice * StrArray_slice * void typedef StrArray typedef StrArray_slice Address_slice * Address_slice * StrArray[4]; StrArray_slice; StrArray_alloc(); StrArray_dup(const StrArray_slice *); StrArray_free(StrArray_slice *); Address; Address_slice; Address_alloc() { return StrArray_alloc(); } Address_dup( const Address_slice * p ) { return StrArray_dup(p); } Address_free(Address_slice * p) { StrArray_free(p); }
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void
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The preceding code looks complicated, but it really means that aliases for types can be used in exactly the same way as the original type For example, with the preceding mapping, you can use StrArray and Address interchangeably in your code
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619 User-Defined Types and _var Classes
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As shown earlier in Table 62, the IDL compiler generates a _var class for every userdefined structured type These _var classes serve the same purpose as String_var; that is, they take on memory management responsibility for a dynamically allocated instance of the underlying type Figure 63 shows the general idea of the generated _var class for an IDL type T, where T is a structure, union, or sequence An instance of a _var class holds a private
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pointer to an instance of the underlying type That instance is assumed to be dynamically allocated and is deallocated by the destructor when the _var instance goes out of scope
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Figure 63 _var class for structures, unions, and sequences
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The _var class acts as a smart pointer that wraps the underlying type The overloaded indirection operator delegates member function calls on the _var instance to the underlying instance Consider the following code fragment, which assumes that T is a sequence type:
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{ T_var sv = new T; // T is a sequence, sv assumes ownership sv->length(1); // operator-> delegates to underlying T // } // ~T_var() deallocates sequence
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This example illustrates that instances of a _var class behave much like ordinary C++ class instance pointers The difference is that _var classes also manage memory for the underlying type 6191 _var Classes for Structures, Unions, and Sequences The following code shows the general form of _var classes for structures, unions, and sequences (Depending on the exact underlying type, there may be additional member functions, which we discuss shortly)
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class T_var { public:
T_var(); T_var(T *); T_var(const T_var &); ~T_var(); operator=(T *); operator=(const T_var &); operator->();
T_var & T_var & T *
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const T *
operator->() const; operator T &(); operator const T &() const; operator[](CORBA::ULong); // For sequences operator[](CORBA::ULong) const; // For sequences
T & const T &
// Other member functions here private: T * myT; }; T_var()
The default constructor initializes the internal pointer to the underlying instance to null As a result, you cannot use a default-constructed _var instance until after you have initialized it
T_var(T *)
The pointer constructor assumes that the passed pointer points to a dynamically allocated instance and takes ownership of the pointer
T_var(const T_var &)
The copy constructor makes a deep copy of both the T_var and its underlying instance of type T This means that assignment to a copy-constructed T_var affects only that copy and not the instance it was copied from
~T_var()