Makes gtest compile cleanly with MSVC's warning 4511 & 4512 (copy ctor /

assignment operator cannot be generated) enabled.

include/gtest/internal/gtest-param-util.h

@@ -248,6 +248,9 @@ class RangeGenerator : public ParamGeneratorInterface<T> {
         : base_(other.base_), value_(other.value_), index_(other.index_),
           step_(other.step_) {}
 
+    // No implementation - assignment is unsupported.
+    void operator=(const Iterator& other);
+
     const ParamGeneratorInterface<T>* const base_;
     T value_;
     int index_;
@@ -263,6 +266,9 @@ class RangeGenerator : public ParamGeneratorInterface<T> {
     return end_index;
   }
 
+  // No implementation - assignment is unsupported.
+  void operator=(const RangeGenerator& other);
+
   const T begin_;
   const T end_;
   const IncrementT step_;
@@ -349,7 +355,10 @@ class ValuesInIteratorRangeGenerator : public ParamGeneratorInterface<T> {
     // Use of scoped_ptr helps manage cached value's lifetime,
     // which is bound by the lifespan of the iterator itself.
     mutable scoped_ptr<const T> value_;
-  };
+  };  // class ValuesInIteratorRangeGenerator::Iterator
+
+  // No implementation - assignment is unsupported.
+  void operator=(const ValuesInIteratorRangeGenerator& other);
 
   const ContainerType container_;
 };  // class ValuesInIteratorRangeGenerator