Emplace, not assign, the object in Lazy<T>.

diff --git a/include/deal.II/base/lazy.h b/include/deal.II/base/lazy.h
index 84975826a16d4388943ea271af10e13a7168a860..abee357210067b199e248889285a734dce856e20 100644 (file)
--- a/include/deal.II/base/lazy.h
+++ b/include/deal.II/base/lazy.h
@@ -379,7 +379,7 @@ inline DEAL_II_ALWAYS_INLINE
       //
       if (!object_is_initialized.load(std::memory_order_relaxed))
         {
-          object = std::move(creator());
+          object.emplace(std::move(creator()));
 
           //
           // Flip the object_is_initialized boolean with "release"