Nested classes have no special access priviledges to their outer class, but

only the vxWorks compiler seems to check this.  Added friend to fix.
An implicit constructor is only created if no user-defined ones exist.

src/libCom/cxxTemplates/epicsSingleton.h

@@ -35,8 +35,8 @@ public:
 private:
     void * _pInstance;
     size_t _refCount;
-	SingletonUntyped ( const SingletonUntyped & );
-	SingletonUntyped & operator = ( const SingletonUntyped & );
+    SingletonUntyped ( const SingletonUntyped & );
+    SingletonUntyped & operator = ( const SingletonUntyped & );
 };
 
 // This class exists for the purpose of avoiding file scope
@@ -49,17 +49,17 @@ public:
     class reference {
     public:
         reference ( epicsSingleton & );
-	    reference ( const reference & );
+        reference ( const reference & );
         ~reference ();
-	    reference & operator = ( const reference & );
+        reference & operator = ( const reference & );
         TYPE * operator -> ();
         const TYPE * operator -> () const;
         TYPE & operator * ();
         const TYPE & operator * () const;
     private:
         epicsSingleton * _pSingleton;
-        reference (); // disabled
     };
+    friend class reference;
     epicsSingleton () {}
     // mutex lock/unlock pair overhead incured
     // when either of these are called
@@ -69,8 +69,8 @@ private:
     SingletonUntyped _singletonUntyped;
     static void * _build ();
     static void _destroy ( void * );
-	epicsSingleton ( const epicsSingleton & );
-	epicsSingleton & operator = ( const epicsSingleton & );
+    epicsSingleton ( const epicsSingleton & );
+    epicsSingleton & operator = ( const epicsSingleton & );
 };
 
 template < class TYPE >