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Darr3 in_val = { 1, 2, 3 }; Darr3_var ret_val;
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ret_val = fv->get_darr4(in_val);
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This code contains two serious errors that are not detected at compile time The array passed to get_darr4 is a three-element array, but get_darr4 expects a four-element array The code for get_darr4 will overrun the passed array by one element, with unpredictable results If the element type is a complex type (such as a union), a core dump is the most likely outcome The returned array has four elements, but ret_val is a _var for a three-element array When ret_val goes out of scope, its destructor calls Darr3_free (instead of Darr4_free) The behavior of this is undefined The most likely outcome is a memory leak (at least if the array contains complex elements, because the destructor for the final element may not be called) Of course, you can suffer worse consequences: if you deallocate a Darr3 using Darr4_free, the deallocation function will overrun the array and may invoke a destructor on an instance that was never constructed The likely outcome is a core dump These problems arise only if you have IDL arrays with differing numbers of elements of the same type, so these mistakes are rare The problems could have been avoided entirely had the C++ mapping chosen to map arrays to classes instead of C++ arrays However, some of the designers thought that it was important to permit the binary layout of the C and C++ mappings to be identical This arrangement is useful if a client uses both mappings in the same address space because it permits passing of IDL types between the two mappings without conversion In hindsight, allowing binary compatibility between the C and C++ mappings was probably a mistake The importance of binary compatibility was overestimated, and, as a result, the C++ mapping is not as type-safe as it could have been In general, CORBA does not provide binary compatibility simply because it is not a binary standard In particular, binary compatibility would severely constrain the options available to implementers and would reduce the number of different environments CORBA can be deployed in 7146 Memory Management for Variable-Length Parameters Before we examine in detail the rules for passing variable-length parameters, it is worth looking further at the motivation for these rules As you saw in Section 692, variable-length types that are returned from the callee to the caller are dynamically allocated; the caller becomes responsible for deallocating the returned value after it is no longer needed So far, we have skirted the question of how a client can possibly deallocate a value that was allocated by a server (Obviously, a pointer to a dynamically allocated block of memory in a server makes no sense in a client's address space)
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Consider this simple interface definition:
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interface Person { string name(); };
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The name operation returns the name of a person as a string The return value has variable length and is dynamically allocated by the callee Figure 7 6 shows a much simplified picture of the actions of client and server when a client invokes the name operation The client code is shown on the left, and the server code on the right For both client and server, the developer-written application code is shaded light gray, and the ORB run-time support code is shaded dark gray (To save space, we have omitted explicit qualification for functions in the CORBA namespace) Also note that the run-time support code is pseudocode (the actual code is more complicated than shown here)
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Figure 76 Returning a variable-length value remote case
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From the perspective of the client application programmer, the code simply looks like this:
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Person_var p = ;
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