Removed a Py_None from cwrap.c.

Added SetNoneComparison in lang.cxx, which allows the language module to
specify how to determine whether the empty argument was given for the
'self' pointer.


git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@4473 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Source/Modules/lang.cxx

@@ -201,6 +201,7 @@ int Dispatcher::namespaceDeclaration(Node *n) { return defaultHandler(n); }
 Language::Language() {
   symbols = NewHash();
   classtypes = NewHash();
+  none_comparison = NewString("$arg != 0");
   overloading = 0;
   multiinput = 0;
   directors = 0;
@@ -1759,7 +1760,8 @@ Language::constructorHandler(Node *n) {
 
   mrename = Swig_name_construct(symname);
   if (CPlusPlus) patch_parms(parms);
-  Swig_ConstructorToFunction(n,ClassType,CPlusPlus,Getattr(n,"template") ? 0 :Extend);
+  Swig_ConstructorToFunction(n,ClassType,none_comparison,
+			     CPlusPlus,Getattr(n,"template") ? 0 :Extend);
   Setattr(n,"sym:name", mrename);
   functionWrapper(n);
   Delete(mrename);
@@ -1779,7 +1781,8 @@ Language::copyconstructorHandler(Node *n) {
   Parm   *parms = Getattr(n,"parms");
   if (CPlusPlus) patch_parms(parms);
   mrename = Swig_name_copyconstructor(symname);
-  Swig_ConstructorToFunction(n,ClassType, CPlusPlus, Getattr(n,"template") ? 0 : Extend);
+  Swig_ConstructorToFunction(n,ClassType, none_comparison,
+			     CPlusPlus, Getattr(n,"template") ? 0 : Extend);
   Setattr(n,"sym:name", mrename);
   functionWrapper(n);
   Delete(mrename);
@@ -2149,3 +2152,7 @@ String * Language::getClassPrefix() const {
 String * Language::getClassType() const {
     return ClassType;
 }
+
+void Language::SetNoneComparison( String *nc ) {
+    none_comparison = nc;
+}

SWIG/Source/Modules/swigmod.h

@@ -209,6 +209,8 @@ public:
   /* Return true if directors are enabled */
   int directorsEnabled() const;
 
+  /* Set none comparison string */
+  void SetNoneComparison( String *s );
 
  protected:
   /* Patch C++ pass-by-value */
@@ -241,6 +243,7 @@ public:
  private:
   Hash   *symbols;
   Hash   *classtypes;
+  String *none_comparison;
   int     overloading;
   int     multiinput;
   int     directors;

SWIG/Source/Swig/cwrap.c

@@ -609,7 +609,8 @@ Swig_directormap(Node *module, String *type) {
  * ----------------------------------------------------------------------------- */
 
 int
-Swig_ConstructorToFunction(Node *n, String *classname, int cplus, int flags)
+Swig_ConstructorToFunction(Node *n, String *classname, 
+			   String *none_comparison, int cplus, int flags)
 {
   ParmList *parms;
   SwigType *type;
@@ -649,16 +650,22 @@ Swig_ConstructorToFunction(Node *n, String *classname, int cplus, int flags)
 	String *name = Getattr(parent, "sym:name");
         String* directorname = NewStringf("__DIRECTOR__%s", name);
 	String* action = NewString("");
+	String* tmp_none_comparison = Copy(none_comparison);
+	
+	Replaceall( tmp_none_comparison, "$arg", "arg1" );
+
         /* if Python class has been subclassed, create a director instance.  
 	 * otherwise, just create a normal instance.
          */
-	Printv(action, "if (arg1 != Py_None) { // subclassed\n",
+	// arty: arg1 != Py_None => tmp_none_comparison
+	Printv(action, "if (",tmp_none_comparison,") { // subclassed\n",
 	               Swig_cresult(type, "result", Swig_cppconstructor_director_call(directorname, parms)),
 		       "} else {\n",
 	               Swig_cresult(type, "result", Swig_cppconstructor_nodirector_call(classname, parms)),
 		       "}\n",
 		       NULL);
 	Setattr(n, "wrap:action", action);
+	Delete(tmp_none_comparison);
 	Delete(action);
         Delete(directorname);
       } else {

SWIG/Source/Swig/swig.h

@@ -436,7 +436,9 @@ extern String    *Swig_cmemberget_call(String_or_char *name, SwigType *t, String
 /* --- Transformations --- */
 
 extern int        Swig_MethodToFunction(Node *n, String *classname, int flags);
-extern int        Swig_ConstructorToFunction(Node *n, String *classname, int cplus, int flags);
+extern int        Swig_ConstructorToFunction(Node *n, String *classname, 
+					     String *none_comparison,
+					     int cplus, int flags);
 extern int        Swig_DestructorToFunction(Node *n, String *classname, int cplus, int flags);
 extern int        Swig_MembersetToFunction(Node *n, String *classname, int flags);
 extern int        Swig_MembergetToFunction(Node *n, String *classname, int flags);