Parameter Passing Rules in Software

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Memory management is a key aspect of using the server-side C++ mapping The simple example we have shown in the previous sections has avoided issues related to memory management in order to focus on servant class definitions As with the client-side rules described in 7, the server-side parameter passing rules are motivated by two overriding requirements Location transparency Memory management must be the same whether or not the client and target object are collocated Efficiency Copying of parameters must be avoided whenever possible, especially when the client and target object are collocated Not surprisingly, the server-side parameter passing rules are essentially a mirror image of the client-side rules, thus allowing for efficient dispatch for collocated objects The parameter passing rules presented here follow the same order as their presentation in Section 714 for the client side If you are not yet comfortable with the differences between fixed- and variable-length types and which IDL types fall into each category, please review Section 7141 before continuing
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971 Parameter Passing for Simple Types Simple types and enumerated types are passed by value or by reference depending on whether the parameter can be changed Here is an IDL operation that uses a long parameter in all possible directions:
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interface Foo { long long_op(in long l_in, inout long l_inout, out long l_out); };
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The corresponding method in the skeleton class has the following signature:
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class POA_Foo : public virtual PortableServer::Servan tBase { public: virtual CORBA::Long long_op( CORBA::Long l_in, CORBA::Long & l_inout, CORBA::Long_out l_out ) throw(CORBA::SystemException) = 0; // };
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An implementation of long_op in a derived servant class might be written as follows:
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CORBA::Long Foo_impl:: long_op( CORBA::Long l_in, CORBA::Long & l_inout, CORBA::Long_out l_out ) throw(CORBA::SystemException) { l_inout = l_in * 2; l_out = l_in / 2; return 99; }
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Values for both l_in and l_inout are passed into this function by the caller Our implementation modifies the value of l_inout for the server ORB run time to send back to the client The l_out parameter is uninitialized upon entering this function, so we also set its value Finally, we send back the return value using a normal C++ return statement 972 Parameter Passing for Fixed-Length Complex Types The rules for passing fixed-length complex types (structures and unions) are similar to those for passing simple types except that in parameters are passed by reference to
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const to avoid copying Here is an IDL operation that passes a fixed-length structure parameter in all possible directions:
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struct Fls { // Fixed-length struct long l_mem; double d_mem; }; interface Foo { Fls fls_op(in Fls fls_in, inout Fls fls_inout, out Fls fls_out); };
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The corresponding method in the skeleton class has the following signature:
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class POA_Foo : public virtual PortableServer::ServantBase { public: virtual Fls fls_op( const Fls & fls_in, Fls & fls_inout, Fls_out fls_out ) throw(CORBA::SystemException) = 0; // };
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An implementation of fls_op in a derived servant class might be written as follows:
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Fls Foo_impl:: fls_op( const Fls & fls_in, Fls & fls_inout, Fls_out fls_out ) throw(CORBA::SystemException) { // Use incoming values of fls_in and fls_inout (not shown) // Modify fls_inout fls_inoutl_mem *= 2; fls_inoutd_mem /= 2; // Initialize fls_out fls_outl_mem = 1234; fls_outd_mem = 567e8; // Create and initialize return value Fls result = { 4321, -987e6 }; return result;
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The fls_in parameter is a reference to const, thus allowing read-only access to the structure members Normally our method would first make use of the in and inout values, but to keep the example simple we do not show that here After we have used the input value for fls_inout, we modify its member values
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Note that as with simple types, inout fixed-length complex types are passed by reference to allow the method to modify them The fls_out parameter is uninitialized upon entering this method, so we initialize its member values so that the server ORB run time can send it back to the client Finally, we declare a local Fls instance and statically initialize it, and we return its value by copy via a normal C++ return statement 973 Parameter Passing for Arrays with Fixed-Length Elements IDL arrays map directly to C++ arrays In C++, arrays are always passed by pointer Here is an IDL operation that passes arrays of fixed-length types in all possible directions:
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typedef double Darr[3]; interface Foo { Darr darr_op( in Darr inout Darr out Darr ); };