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improve try-catch-statement to save exception to a variable (bug #33217) * oct-parse.in.yy (except_command): Handle exception identifiers. * oct-parse.in.yy, parse.h (octave_base_parser::make_try_command): New arg, ID. * pt-except.cc, pt-except.h (tree_try_catch_command::expr_id): New data member. (tree_command::tree_command): Initialize it. (tree_command::~tree_command): Delete it. (tree_command::identifier): New function. * pt-check.cc (tree_checker::visit_try_catch_command): Check for valid expr_id. * pt-pr-code.cc (tree_print_code::visit_try_catch_command): Print expr_id. * pt-eval.cc (tree_evaluator::visit_try_catch_command): Assign message and identifier to variable. * try.tst: New test. * NEWS: Note change.
author Stefan Mahr <dac922@gmx.de>
date Tue, 13 Aug 2013 19:35:53 +0200
parents e993fa124b46
children 5ff843d739fc
line wrap: on
line diff
--- a/NEWS
+++ b/NEWS
@@ -100,6 +100,29 @@
 
     will be consistent with other binary operators.
 
+ ** Octave now has limited support for named exceptions
+
+    The following syntax is now accepted:
+
+      try
+        statements
+      catch exception-id
+        statements
+      end
+
+    The exception-id is a structure with the fields "message" and
+    "identifier".  For example
+
+      try
+        error ("Octave:error-id", "error message");
+      catch myerr
+        printf ("identifier: %s\n", myerr.identifier);
+        printf ("message:    %s\n", myerr.message);
+      end_try_catch
+
+    When classdef-style classes are added to Octave, the exception-id
+    will become an MException object.
+
  ** Warning IDs renamed:
 
     Octave:array-as-scalar => Octave:array-to-scalar