cxx: Add nullptr constructor for weak refs

This allows constructs such as:

  wref_obj = obj;
  ...
  wref_obj = nullptr;

1 files changed, 8 insertions, 0 deletions

diff --git a/src/bindings/cxx/eo_cxx/eo_wref.hh b/src/bindings/cxx/eo_cxx/eo_wref.hh
index fc32e47616..048ffcaa0f 100644
--- a/src/bindings/cxx/eo_cxx/eo_wref.hh
+++ b/src/bindings/cxx/eo_cxx/eo_wref.hh
@@ -27,6 +27,14 @@ struct wref
    wref() : _eo_wref(nullptr)
    {
    }
+
+   /// @brief Empty constructor on nullptr.
+   ///
+   /// Create a empty weak reference.
+   ///
+   wref(std::nullptr_t) : _eo_wref(nullptr)
+   {
+   }
   
    /// @brief Class constructor.
    ///