Avoid a warning about an unused constructor argument.

Annoyingly, my compiler warns about =default constructors whenever we name constructor
arguments. It says they are unused -- which is patently wrong: the argument is used
just fine, we just never explicitly reference the *name* of the argument. Either way,
work around this.

diff --git a/include/deal.II/lac/block_vector_base.h b/include/deal.II/lac/block_vector_base.h
index 26ba82b8218a7161e955deebfd7a2a9d02482650..40f50727972a5e63d53c05913445a1b00dab50bf 100644 (file)
--- a/include/deal.II/lac/block_vector_base.h
+++ b/include/deal.II/lac/block_vector_base.h
@@ -556,7 +556,7 @@ public:
   /**
    * Copy constructor.
    */
-  BlockVectorBase (const BlockVectorBase &V) = default;
+  BlockVectorBase (const BlockVectorBase &/*V*/) = default;
 
   /**
    * Move constructor. Each block of the argument vector is moved into the current