try and catch statements.
try and catch statements, so the CORBA specification defines an Environment class for reflecting exceptions. ISB for C++ uses the Environment class, along with a set of macros, to provide your applications with exception handling capabilities when try and catch are not supported.
Environment class is used internally by the ORB and is transparent to you as a programmer. The only requirement is that you use these exception macros to throw, try and catch exceptions. These macros will transparently manipulate the Environment class for you if your compiler does not support exceptions.
Table 11.14 The PMC exception Macros.
Using the Exception Macros
The following code example shows how to use the compatibility exception macros.
Using the compatibility macros to catch a system exception.
....
library *library_object;PMCTRY {
library_object = library::_bind();
}
// Check for errorsPMCCATCH(CORBA::SystemException excep) {
cout << "System Exception occurred:" << endl;
cout << "Exception name: " << excep._name() << endl;
cout << "Minor code: " << excep.minor() << endl;
cout << "Completion code: " << excep.completed() << endl;
}
PMCENDCATCH
... Object Implementation Considerations
The IDL compiler detects whether or not your C++ compiler supports exceptions and generates code accordingly. The sample code below would appear as follows for a compiler without C++ support. Note that the throw statement is not generated.
virtual CORBA::Boolean add_book(const book& book_info);
The object's implementation of add_book would use PMCTHROW to raise the exception.
CORBA::Boolean Library::add_book(const book& book_info)
{
CORBA::Boolean ret;
if( (ret = bk_list.add_to_list(book_info)) == 0 )
PMCTHROW (library::CapacityExceeded();)
return ret;
}
Last Updated: 02/03/98 15:34:36
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