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IT-SC book: Advanced CORBA Programming with C++
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A future version of the C++ mapping will likely make ostream inserters a standard feature
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If your ORB does not provide ostream inserters for exceptions, you can easily write your own:
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// Generic ostream inserter for exceptions Inserts the exception // name, if available, and the repository ID otherwise static ostream & operator<<(ostream & os, const CORBA::Exception & e) { CORBA::Any tmp; tmp <<= e; CORBA::TypeCode_var tc = tmptype(); const char * p = tc->name(); if (*p != '\0') os << p; else os << tc->id(); return os; }
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This code relies on types Any and TypeCode to achieve generic insertion of exceptions; we discuss these features in detail in s 15 and 16 You can also create overloaded ostream inserters for more derived exceptions to control the formatting of specific system and user exceptions (see Section 852 for an example) 7157 Mapping for Compilers that Lack C++ Exception Support CORBA defines an alternative exception mapping for compilers that lack C++ exception handling support The alternative mapping adds an additional parameter to every operation signature Client code explicitly must test the value of that parameter after every call to check whether an exception was raised This works, but it is not nearly as elegant as using real C++ exceptions By now, almost all C++ compilers support C++ exception handling even if they are not yet fully standard C++ compliant, so the alternative mapping is rapidly becoming obsolete For this reason, we do not cover it here If you need to use the alternative mapping, consult the specification [17a] for details The Exception::_raise function we saw in Section 7151 is provided for environments that mix old non-exception-aware code and exception handling code in the same binary (This can happen if you have legacy code that does not use C++ exceptions and you now want to link the legacy code with exception-aware code written later) _raise is implemented in the generated code as follows:
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void SomeException::_raise()
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IT-SC book: Advanced CORBA Programming with C++
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throw *this;
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The _raise function allows exception-aware code to transform an IDL exception received as a parameter into a real C++ exception Unless you need to mix nonexception-aware and exception-aware source code, you will not need to call _raise As you can see from its implementation, _raise simply throws the corresponding exception _raise is also useful for clients using the Dynamic Invocation Interface because it enables the client to rethrow an exception without knowing its precise type
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716 Mapping for Contexts
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If an IDL operation uses a context clause, the corresponding C++ operation signature has an extra trailing parameter For example:
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interface Foo { string get_name(in long id) context("USER", "GROUP", "X*"); };
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This generates the following operation signature:
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char * get_name(CORBA::Long id, CORBA::Context_ptr c);
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The extra parameter is a reference to a pseudo-object of type CORBA::Context The Context object has methods you can call to create and modify context variables You can also connect multiple context objects into hierarchies, so that objects higher in the hierarchy provide default values and objects lower in the hierarchy override these defaults Because of the problems we outlined in Section 413, we do not show the mapping for contexts in this book You can consult the specification [17a] for details
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The client-side C++ mapping provides APIs that permit clients to initialize the ORB run time, obtain object references, invoke operations, and handle exceptions To preserve location transparency and efficiency, the client-side mapping has complex memory management rules for fixed- and variable-length types The complexity of these rules can be overcome by judicious use of _var types, which hide much of the low-level memory management responsibilities from you and make errors less likely
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Despite its apparent complexity, the client-side mapping quickly becomes second nature After a few days of programming, you will be less and less concerned with the mapping and handle most CORBA programming tasks as routinely as any other programming task
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