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In practice, such problems rarely occur because _var classes are used mainly to avoid memory leaks for return values and out parameters You will see more examples of using _var classes in Section 71412 6194 Differences Among Fixed- and Variable-Length Structures, Unions, and Sequences The generated _var classes vary slightly in their interfaces depending on whether they wrap a fixed-length or a variable-length type Normally, these differences are transparent to you They exist to hide differences in parameter passing rules for fixed-length and variable-length types (we discuss this in more detail in Section 71412) All _var classes provide in, inout, out, and _retn member functions (with different signatures depending on whether the _var class wraps a variable- or a fixedlength type) In addition, _var classes for variable-length types have an extra conversion operator, whereas _var classes for fixed-length types provide an extra constructor and assignment operator
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Additional T_var Member Functions for Variable-Length Types
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In addition to the member functions discussed on page 212, for a variable-length structure, union, or sequence of type T, the IDL compiler generates the following:
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class T_var { public: // Normal member functions here // Member functions for variable-length T: operator T * &(); const T & in() const; T & inout(); T * & out(); T * _retn();
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operator T * &()
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This additional conversion operator allows you to pass a variable-length T_var where a reference to a pointer to T is expected This operator is used if T_var instances for variable-length types are passed as out parameters We discuss this in detail in Section 714
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const T & in() const T & inout() T * & out()
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These member functions allow you to explicitly pass a T_var as an in, inout, or out parameter instead of relying on default conversions The functions are useful mainly if your compiler has defects relating to default conversions You can also call these functions explicitly to improve code readability If you pass a T_var instance to a function, it may not be immediately obvious whether the called function will modify the underlying value By using these member functions, you can improve readability of the code:
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StrSeq_var sv = ; some_func(sv); some_func(svout()); // Passed as in, inout, or out // Much clearer
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The out member function deallocates the underlying instance of type T as a side effect to prevent memory leaks if the same T_var instance is passed to successive calls:
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StrSeq_var sv = ; some_func(svout()); some_func(svout()); // Sets sv to heap-allocated instance // Deallocates previous instance, assumes // ownership of new instance
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T * _retn()
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This function returns the pointer to the underlying instance of type T and also relinquishes ownership of that pointer It is useful mainly when you create a T_var to avoid memory leaks but then must transfer ownership of the underlying type
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Additional T_var Member Functions for Fixed-Length Types
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For a T_var for a fixed-length structure, union, or sequence of type T, the IDL compiler generates the following:
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class T_var { public: // Normal member functions here // Member functions for fixed-length T: T_var(const T &); T_var & operator=(const T &); const T & in() const; T & inout(); T & out(); T _retn();
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}; T_var(const T &) T & operator=(const T &)
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The additional constructor and assignment operator permit you to construct or assign a T_var from a T
const T & in() const T & inout() T & out() T _retn()
These member functions are provided to deal with defective compilers that cannot handle default conversions correctly They also make the direction in which a parameter is passed explicit at the point of call, something that improves code readability The out and _retn member functions for fixed-length types do not relinquish ownership of the underlying type They cannot do this because they do not return a pointer 6195 _var Types for Arrays The _var types generated for arrays follow a similar pattern as those for structures, unions, and sequences The differences are that _var types for arrays do not overload the indirection operator (it is not needed for arrays) and that the return types of some of the member functions are different _var types for arrays with variable-length and fixedlength elements also have some differences