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/hres_timer/hres_timer.h b/src/lib/entropy/hres_timer/hres_timer.h
index 93ced283a..d297a87b1 100644
--- a/src/lib/entropy/hres_timer/hres_timer.h
+++ b/src/lib/entropy/hres_timer/hres_timer.h
@@ -18,7 +18,7 @@ namespace Botan {
 * @note Any results from timers are marked as not contributing entropy
 * to the poll, as a local attacker could observe them directly.
 */
-class High_Resolution_Timestamp : public Entropy_Source
+class High_Resolution_Timestamp final : public Entropy_Source
    {
    public:
       std::string name() const override { return "timestamp"; }