From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 6 Jul 2023 13:16:34 +0000 (-0600)
Subject: Add a changelog entry.
X-Git-Tag: relicensing~708^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cf880b87d0552eb25a34c462a5cbb0cc0f219cd6;p=dealii.git

Add a changelog entry.
---

diff --git a/doc/news/changes/major/20230706Bangerth b/doc/news/changes/major/20230706Bangerth
new file mode 100644
index 0000000000..bd046419ad
--- /dev/null
+++ b/doc/news/changes/major/20230706Bangerth
@@ -0,0 +1,13 @@
+Removed: Some, but not all, of the vector classes were derived from a
+base class VectorSpaceVector. This class had been intended to provide
+an abstract interface (via `virtual` functions) to vector-vector
+operations such as dot products or norms. But it turns out that that
+is not practical in many cases: Functions still need to either have
+access to individual elements of the vector, or they need to be able
+to do matrix-vector products. As a consequence, it is rarely useful to
+only have a reference to the base class VectorSpaceVector: One
+actually needs a reference to the derived class. Because of this lack
+of use, we have removed the VectorSpaceVector base class from the
+library.
+<br>
+(Wolfgang Bangerth, 2023/07/06)