gcc 9 complains that it is creating an implicit copy constructor. (#408)

* gcc 9 complains that it is creating an implicit copy constructor.
This is deprecated behaviour since C++11 and gcc 9 treats it as a warning.
Adding a copy constructor silences this.

Fixes #387

1 files changed, 8 insertions, 0 deletions

diff --git a/cpp/include/IceUtil/Optional.h b/cpp/include/IceUtil/Optional.h
index a4266aeeb6c..ac12789bfd9 100644
--- a/cpp/include/IceUtil/Optional.h
+++ b/cpp/include/IceUtil/Optional.h
@@ -45,6 +45,14 @@ public:
     Optional(IceUtilInternal::NoneType) : _isSet(false)
     {
     }
+    
+    /**
+     * Constructs an optional as a copy of the given optional.
+     * @param r The source optional.
+     */
+    Optional(const Optional& r) : _value(r._value), _isSet(r._isSet)
+    {
+    }
 
     /**
      * Constructs an optional with the given value.