Add final attribute to many classes

In some cases this can offer better optimization, via devirtualization.
And it lets the user know the class is not intended for derivation.

Some discussion in GH #402

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/entropy/rdrand/rdrand.h b/src/lib/entropy/rdrand/rdrand.h
index 1fa928641..48d090775 100644
--- a/src/lib/entropy/rdrand/rdrand.h
+++ b/src/lib/entropy/rdrand/rdrand.h
@@ -16,7 +16,7 @@ namespace Botan {
 * Entropy source using the rdrand instruction first introduced on
 * Intel's Ivy Bridge architecture.
 */
-class Intel_Rdrand : public Entropy_Source
+class Intel_Rdrand final : public Entropy_Source
    {
    public:
       std::string name() const override { return "rdrand"; }