add %exceptionclass and %noexceptionclass directives and manage the feature:exceptionclass in a consistent way

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@7548 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Lib/python/std_except.i

@@ -5,21 +5,29 @@
 #include <stdexcept>
 %}
 
+
+
 namespace std {
-  /* Mark all of them as exception classes */
-  %feature("exceptionclass")  exception;  
-  %feature("exceptionclass")  bad_exception;
-  %feature("exceptionclass")  logic_error;
-  %feature("exceptionclass")  domain_error;
-  %feature("exceptionclass")  invalid_argument;
-  %feature("exceptionclass")  length_error;
-  %feature("exceptionclass")  out_of_range;
-  %feature("exceptionclass")  runtime_error;
-  %feature("exceptionclass")  range_error;
-  %feature("exceptionclass")  overflow_error;
-  %feature("exceptionclass")  underflow_error;
+  /* 
+     Mark all of std exception classes as "exception classes" via
+     the "exceptionclass" feature.
+     
+     If needed, you can disable it by using %noexceptionclass.
+  */
+  %exceptionclass  exception;  
+  %exceptionclass  bad_exception;
+  %exceptionclass  logic_error;
+  %exceptionclass  domain_error;
+  %exceptionclass  invalid_argument;
+  %exceptionclass  length_error;
+  %exceptionclass  out_of_range;
+  %exceptionclass  runtime_error;
+  %exceptionclass  range_error;
+  %exceptionclass  overflow_error;
+  %exceptionclass  underflow_error;
 }
 
+
 namespace std {
   struct exception 
   {

SWIG/Lib/swig.swg

@@ -66,6 +66,10 @@
 #endif
 #define %noexception %feature("except","")
 
+#define %exceptionclass %feature("exceptionclass","1")
+#define %noexceptionclass %feature("exceptionclass","0")
+
+
 #define %newobject   %feature("new")
 
 /* Warnings */

SWIG/Source/Modules/allocate.cxx

@@ -467,7 +467,9 @@ class Allocate : public Dispatcher {
       }
       Node *c = Swig_symbol_clookup(t,0);
       if (c) {
-	Setattr(c,"feature:exceptionclass","1");
+	if (!Getattr(c,"feature:exceptionclass")) {
+	  Setattr(c,"feature:exceptionclass","1");
+	}
       }
       p = nextSibling(p);
       Delete(t);

SWIG/Source/Modules/python.cxx

@@ -1954,7 +1954,7 @@ public:
       have_constructor = 0;
       have_repr = 0;
       
-      if (Getattr(n,"feature:exceptionclass")) {
+      if (checkAttribute(n,"feature:exceptionclass","1")) {
 	classic = 1;
         modern  = 0;
       }