struct Vls { long l_mem; // Variable-length struct in Software

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string s_mem;
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interface Foo { Vls vls_op( in Vls inout Vls out Vls ); };
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vls_in, vls_inout, vls_out
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The corresponding method in the generated proxy has this signature:
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class Foo : public CORBA::Object { public: // virtual Vls * vls_op( const Vls & vls_in, Vls & vls_inout, Vls_out vls_out ) = 0; // };
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The type Vls_out is a class whose constructor accepts an argument of type Vls * & (We examine the implementation of _out classes again in Section 71413 For now, assume that Vls_out is the same as Vls * &) Following are the memory management responsibilities The in parameter vls_in is passed as a reference to const This avoids the need to copy the structure onto the stack and prevents the callee from modifying the parameter An in struct can be allocated on the stack, in the data segment, or on the heap The inout parameter vls_inout is allocated and initialized by the caller and passed by reference This permits the callee to modify the contents of the structure via the reference Note that no pointer need be passed here If the callee wants to modify the string member s_mem of the structure, it can do so simply by assignment The structure looks after the memory management of its string member (the member is a String_mgr) The caller can allocate the structure it passes anywhere (on the stack, in the data segment, or on the heap) The out parameter vls_out is passed as a reference to a pointer The result is dynamically allocated by the callee The caller becomes responsible for eventually calling delete to deallocate the out parameter The return value behaves like an out parameter The value is allocated by the proxy, and the caller must deallocate it with delete
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Here is some example code that illustrates the memory management rules:
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Foo_var fv = ; Vls Vls Vls Vls in_val; inout_val; * out_val; * ret_val; // Get reference // // // // Note Note Note Note stack allocation stack allocation pointer pointer
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in_vall_mem = 99; // Initialize in param in_vals_mem = CORBA::string_dup("Hello") ; inout_vall_mem = 5; // Initialize inout param inout_vals_mem = CORBA::string_dup("World"); ret_val = fv->vls_op(in_val, inout_val, out_val); // in_val is unchanged here, inout_val may have // been modified, and out_val and ret_val contain // structures returned by the operation delete out_val; delete ret_val; // Must deallocate out param // Must deallocate return value
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Values of type any follow the same parameter passing rules ( 15 discusses the mapping for any in detail) 7149 Parameter Passing for Arrays with Variable-Length Elements The responsibilities for memory allocation and deallocation of variable-length elements in arrays are the same as for other variable-length types However, because of the limited array concept of C++, arrays with variable-length elements are passed by pointer to an array slice Here is the IDL for an operation that passes an array with variable-length elements in all possible directions:
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struct Vls { long number; string name; }; typedef Vls Varr[3]; interface Foo { Varr varr_op( in Varr inout Varr out Varr ); }; // Variable-length struct
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// Variable-length array
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To make this example a little more interesting, we use an array containing variable-length structure elements, and that makes the array itself variable-length The corresponding method in the proxy has this signature:
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struct Vls { // }; typedef Vls typedef Vls * Varr[3]; Varr_slice;
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class Foo : public virtual CORBA::Object { public: // virtual Varr_slice * varr_op( const Varr Varr_slice * Varr_out ) = 0; // }; // void Varr_free(Varr_slice *); //
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varr_in, varr_inout, varr_out
Varr_out is a class whose constructor accepts an argument of type Varr_slice * & If you compare the preceding mapping with the one for arrays having fixed-length elements, you find only one real difference: for an out parameter for an array having variable-length elements, a reference to a pointer is passed instead of only a pointer This is because for arrays having variable-length elements, out parameters are allocated by the callee, whereas for arrays having fixed-length elements, out parameters are allocated by the caller Following are all the memory management rules for arrays having variablelength elements in arrays must be initialized and can be allocated anywhere (on the stack, in the data segment, or on the heap) inout arrays must be initialized and can be allocated anywhere (on the stack, in the data segment, or on the heap) out arrays are allocated by the callee Responsibility for deallocation passes to the caller Returned arrays are allocated by the callee Responsibility for deallocation passes to the caller Arrays having variable-length elements are passed as a pointer to an array slice For out arrays, it is a reference to a pointer to an array slice Following is example code that illustrates the memory management rules: