Array _var Mapping for Arrays with Variable-Length Elements in Software

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Array _var Mapping for Arrays with Variable-Length Elements
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It is easiest to illustrate the mapping with an example Here we define a three-element array containing variable-length structures:
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struct Fraction { double numeric; string alphabetic; }; typedef Fraction FractArr[3]; // Variable-length structure
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This maps to the following C++ definitions:
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struct Fraction { CORBA::Double CORBA::String_mgr }; class Fraction_var { public: // As before }; typedef Fraction FractArr[3]; typedef Fraction FractArr_slice; numeric; alphabetic;
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FractArr_slice * FractArr_slice * void
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void class FractArr_var { public:
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FractArr_alloc(); FractArr_dup(const FractArr_slice *); FractArr_copy( FractArr_slice * to, const FractArr_slice * from ); FractArr_free(FractArr_slice *);
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FractArr_var(); FractArr_var(FractArr_slice *); FractArr_var(const FractArr_var &); ~FractArr_var(); operator=(FractArr_slice *); operator=(const FractArr_var & rhs); operator[](CORBA::ULong); operator[](CORBA::ULong) const; operator FractArr_slice *(); operator const FractArr_slice *() const; operator FractArr_slice * &();
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FractArr_var & FractArr_var & Fraction & const Fraction &
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const FractArr_slice * FractArr_slice * FractArr_slice * & FractArr_slice *
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in() const; inout(); out(); _retn();
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If all this looks a little intimidating, remember that the various member functions do exactly the same things as for _var types for structures, unions, and sequences The default constructor initializes the internal pointer to the underlying array to null Constructors and assignment operators that accept an argument of type FractArr_slice * assume that the array was allocated with FractArr_alloc or FractArr_dup, and they take ownership of the passed pointer The copy constructor and FractArr_var & assignment operator each make a deep copy The destructor deallocates the array by calling FractArr_free The subscript operators allow indexing into the array, so you can use a FractArr_var as if it were the actual array The conversion operators permit passing the array as an in, inout, or out parameter (see Section 71412)
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The explicit conversion functions in, inout, and out behave as for structures, unions, and sequences The _retn function permits you to relinquish ownership of the underlying type All this means that you can use an array _var as if it were the actual array; you just need to remember that an array _var must be initialized with dynamically allocated memory
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const char * fractions[] = { "1/2", "1/3", "1/4" }; FractArr_var fa1 = FractArr_alloc(); for (CORBA::ULong i = 0; i < 3; i++) { fa1[i]numeric = 10 / (i + 2); fa1[i]alphabetic = fractions[i]; } // Initialize fa1 // Deep copy // Deep copy // Explicit copy // Deep assignment Print fa1
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FractArr_var fa2 = fa1; fa2[0]alphabetic = CORBA::string_dup("half"); fa2[1] = fa2[2]; coutprecision(2); for (CORBA::ULong i = 0; i < 3; i++) { // cout < < < < "fa1[" < i < "]numeric = " fa1[i]numeric ",\tfa1[" < i < "]alphabetic = " fa1[i]alphabetic < endl;
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} cout < endl; for (CORBA::ULong i = 0; i < 3; i++) { // Print fa2 cout < "fa2[" < i < "]numeric = " < fa2[i]numeric < ",\tfa2[" < i < "]alphabetic = " < fa2[i]alphabetic < endl; }
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The output of this program is as follows:
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fa1[0]numeric = 05, fa1[1]numeric = 033, fa1[2]numeric = 025, fa2[0]numeric = 05, fa2[1]numeric = 025, fa2[2]numeric = 025, fa1[0]alphabetic = 1/2 fa1[1]alphabetic = 1/3 fa1[2]alphabetic = 1/4 fa2[0]alphabetic = half fa2[1]alphabetic = 1/4 fa2[2]alphabetic = 1/4
Array _var Mapping for Arrays with Fixed-Length Elements
The mapping for _var types for arrays with fixed-length elements is almost identical to the mapping for _var types for arrays with variable-length elements Here we define a three-element array containing fixed-length structures:
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struct S { // Fixed-length structure long l_mem; char c_mem; }; typedef S StructArray[3];
The mapping for the corresponding StructArray_var type is as follows:
class StructArray_var { public: StructArray_var(); StructArray_var(StructArray_slice *); StructArray_var(const StructArray_var &); ~StructArray_var(); StructArray_var & operator=(StructArray_slice *); StructArray_var & operator=(const StructArray_var & rhs); S & const S & operator[](CORBA::ULong); operator[](CORBA::ULong) const;
operator StructArray_slice *(); operator const StructArray_slice *() const; const StructArray_slice * in() const; StructArray_slice * inout(); StructArray_slice * out(); StructArray_slice * _retn();
The only differences between _var types for arrays with fixed-length and those for variable-length elements are that for fixed-length elements, the out member function returns a pointer instead of a reference to a pointer and that no user-defined conversion operator for StructArray_slice * & is defined These differences originate in the different parameter passing rules for variable-length and fixed-length types We discuss these rules in detail in Section 714
620 Summary
The basic C++ mapping defines how built-in types and user-defined types map to C++ Although some of the classes generated by the mapping have a large number of member functions, within a short time you will find yourself using them as you use any other data type Even the memory management rules, which may seem complex right now, soon become second nature When writing your code, keep in mind that you should be looking at the IDL definitions and not at the generated header files In that way, you avoid getting confused by many internal details and cryptic work-arounds for different platforms and compilers