Fix deprecated-copy warnings

It's long been a guideline (and IIRC a Weff-c++ warning) that either all, or
none, of the copy methods should be defined, but this became a standard warning
in GCC9.  Presumably to account for a later language change though I'm not sure
which.

I don't remember why the ChanMapping copy constructor can't just be a simple
copy (it's just a map of POD), but figure it's safer to just copy what that
does.

1 files changed, 5 insertions, 0 deletions

diff --git a/libs/pbd/pbd/properties.h b/libs/pbd/pbd/properties.h
index 37e40bf2b2..5e3412ebf0 100644
--- a/libs/pbd/pbd/properties.h
+++ b/libs/pbd/pbd/properties.h
@@ -253,6 +253,11 @@ public:
 		return this->_current;
 	}
 
+	Property<T>& operator=(Property<T> const& v) {
+		this->set (v);
+		return *this;
+	}
+
 private:
         friend class PropertyFactory;