The syntax is:
try_ [ sequenced_statements ] .catch_<exception_type>() [ sequenced_statements ] .catch_<another_exception_type>(local-id) [ sequenced_statements ] ... .catch_all [ sequenced_statement ]
Note the usual underscore after try and catch, and the extra parentheses required after the catch.
The second form of catch statement can refer thrown exception using specified local-id, which is Local Variables, in sequenced_statements.
Example: The following code calls the (lazy) function
for each element, and prints messages about different exception types it
try_ [ f(arg1) ] .catch_<runtime_error>() [ cout << val("caught runtime error or derived\n") ] .catch_<exception>(e_) [ cout << val("caught exception or derived: ") << bind(&exception::what, e_) << val("\n") ] .catch_all [ cout << val("caught some other type of exception\n") ]