Fixes for compactdefaultargs and pass by value where the class being passed by value has no default constructor - previously it used SwigValueWrapper

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@11312 626c5289-ae23-0410-ae9c-e8d60b6d4f22

CHANGES.current

@@ -1,6 +1,12 @@
 Version 1.3.40 (in progress)
 ============================
 
+2009-06-24: wsfulton
+            Fix wrapping methods with default arguments and the compactdefaultargs feature 
+            where a class is passed by value and is assigned a default value. The SwigValueWrapper
+            template workaround for a missing default constructor is no longer used as the code 
+            generated does not call the default constructor.
+
 2009-06-16: wsfulton
 	    [Java,C#] Fix enum marshalling when %ignore is used on one of the enum items.
             Incorrect enum values were being passed to the C++ layer or compilation errors resulted.

Examples/test-suite/default_args.i

@@ -119,6 +119,7 @@
 
 
 // tests valuewrapper
+%feature("compactdefaultargs") MyClass2::set;
 %inline %{
   enum MyType { Val1, Val2 }; 
 
@@ -134,6 +135,7 @@
       void set(MyClass1 cl1 = Val1) {}
       // This could have been written : set(MyClass1 cl1 = MyClass1(Val1)) 
       // But it works in C++ since there is a "conversion" constructor in  MyClass1. 
+      void set2(MyClass1 cl1 = Val1) {}
   };
 %}
 

Source/Swig/cwrap.c

@@ -195,7 +195,11 @@ int Swig_cargs(Wrapper *w, ParmList *p) {
       String *type = Getattr(p, "type");
       /* default values only emitted if in compact default args mode */
       String *pvalue = (compactdefargs) ? Getattr(p, "value") : 0;
-      SwigType *altty = SwigType_alttype(type, 0);
+
+      /* When using compactdefaultargs, the code generated initialises a variable via a constructor call that accepts the
+       * default value as a parameter. The default constructor is not called and therefore SwigValueWrapper is not needed. */
+      SwigType *altty = pvalue ? 0 : SwigType_alttype(type, 0);
+
       int tycode = SwigType_type(type);
       if (tycode == T_REFERENCE) {
 	if (pvalue) {