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<H1><A NAME="SECTION03260000000000000000"></A>
<A NAME="6638"></A>
<BR>
Catching and Throwing Exceptions in C++
</H1>
Adapted from the Babel regression tests, the following is an example of a
package called ExceptionTest that has a class named Fib with a method declared
in SIDL as follows:
<P>
<BR>
<PRE CLASS="verbatim">int getFib(in int n, in int max_depth, in int max_value, in int depth)
throws NegativeValueException, FibException;
</I></PRE></td></tr></table></blockquote>
<P>
The corresponding C++ code fragment to use this method is:
<P>
<BR>
<PRE CLASS="verbatim">ExceptionTest::Fib fib = ExceptionTest::Fib::_create();
try {
int result = fib.getFib( 4, 100, 32000, 0 );
cout << "Result of fib.getFib() = " << result << endl;
} catch ( ExceptionTest::NegativeValueException e ) {
// ...
} catch ( ExceptionTest::FibException e ) {
// ...
}
</PRE></td></tr></table></blockquote>
<P>
This example shows the standard way to throw an exception in C++. You
are not strictly required to call the <TT>setNote</TT> and <TT>add</TT>
methods; however, these methods provide information that may be
helpful in debugging or error reporting.
<P>
<BR>
<PRE CLASS="verbatim">int32_t
ExceptionTest::Fib_impl::getFib (
/*in*/ int32_t n, /*in*/ int32_t max_depth,
/*in*/ int32_t max_value, /*in*/ int32_t depth )
throw (
::ExceptionTest::NegativeValueException,
::ExceptionTest::FibException
){
// DO-NOT-DELETE splicer.begin(ExceptionTest.Fib.getFib)
if (n < 0) {
NegativeValueException ex = NegativeValueException::_create();
ex.setNote("n negative");
ex.add(__FILE__, __LINE__, "ExceptionTest::Fib_impl::getFib");
throw ex;
}
// several lines delete
// DO-NOT-DELETE splicer.end(ExceptionTest.Fib.getFib)
}
</PRE></td></tr></table></blockquote>
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