# HG changeset patch
# User John W. Eaton <jwe@octave.org>
# Date 1347935738 14400
# Node ID 2e5ba861898f386c3aef44a52e83a99a805fcd93
# Parent  231d8d3b82257852f001b00d0a224b4680181b6a
default arg values for DEFUN functions

* defun-int.h (DECLARE_FUNXX, DECLARE_FUNX_NO_DEFAULTS,
DECLARE_FUN_NO_DEFAULTS): New macros.
(DECLARE_FUNX): Define using DECLARE_FUNXX.  Provide default argument
values.
* defun-dld.h (DEFUN_DLD, DEFUNX_DLD): Use DECLARE_FUNX_NO_DEFAULTS
instead of DECLARE_FUNX.

diff --git a/libinterp/interp-core/defun-dld.h b/libinterp/interp-core/defun-dld.h
--- a/libinterp/interp-core/defun-dld.h
+++ b/libinterp/interp-core/defun-dld.h
@@ -57,14 +57,14 @@
 #else
 
 #define DEFUN_DLD(name, args_name, nargout_name, doc) \
-  DECLARE_FUN (name, args_name, nargout_name); \
+  DECLARE_FUN_NO_DEFAULTS (name, args_name, nargout_name); \
   DEFINE_FUN_INSTALLER_FUN (name, doc) \
-  DECLARE_FUN (name, args_name, nargout_name)
+  DECLARE_FUN_NO_DEFAULTS (name, args_name, nargout_name)
 
 #define DEFUNX_DLD(name, fname, gname, args_name, nargout_name, doc) \
-  DECLARE_FUNX (fname, args_name, nargout_name); \
+  DECLARE_FUNX_NO_DEFAULTS (fname, args_name, nargout_name); \
   DEFINE_FUNX_INSTALLER_FUN (name, fname, gname, doc) \
-  DECLARE_FUNX (fname, args_name, nargout_name)
+  DECLARE_FUNX_NO_DEFAULTS (fname, args_name, nargout_name)
 
 #endif
 
diff --git a/libinterp/interp-core/defun-int.h b/libinterp/interp-core/defun-int.h
--- a/libinterp/interp-core/defun-int.h
+++ b/libinterp/interp-core/defun-int.h
@@ -77,13 +77,23 @@
 extern OCTINTERP_API void
 defun_isargout (int, int, bool *);
 
+#define DECLARE_FUNXX(name, args_decl, nargout_decl) \
+  OCTAVE_EXPORT octave_value_list name (args_decl, nargout_decl)
+
 #define DECLARE_FUNX(name, args_name, nargout_name) \
-  OCTAVE_EXPORT octave_value_list \
-  name (const octave_value_list& args_name, int nargout_name)
+  DECLARE_FUNXX (name, \
+                 const octave_value_list& args_name = octave_value_list (), \
+                 int nargout_name = 0)
+
+#define DECLARE_FUNX_NO_DEFAULTS(name, args_name, nargout_name) \
+  DECLARE_FUNXX (name, const octave_value_list& args_name, int nargout_name)
 
 #define DECLARE_FUN(name, args_name, nargout_name) \
   DECLARE_FUNX (F ## name, args_name, nargout_name)
 
+#define DECLARE_FUN_NO_DEFAULTS(name, args_name, nargout_name) \
+  DECLARE_FUNX_NO_DEFAULTS (F ## name, args_name, nargout_name)
+
 // Define the code that will be used to insert the new function into
 // the symbol table.  We look for this name instead of the actual
 // function so that we can easily install the doc std::string too.