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

3 files changed, 3 insertions, 3 deletions

diff --git a/src/lib/hash/checksum/adler32/adler32.h b/src/lib/hash/checksum/adler32/adler32.h
index c42c184c9..73df6134a 100644
--- a/src/lib/hash/checksum/adler32/adler32.h
+++ b/src/lib/hash/checksum/adler32/adler32.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * The Adler32 checksum, used in zlib
 */
-class BOTAN_DLL Adler32 : public HashFunction
+class BOTAN_DLL Adler32 final : public HashFunction
    {
    public:
       std::string name() const override { return "Adler32"; }
diff --git a/src/lib/hash/checksum/crc24/crc24.h b/src/lib/hash/checksum/crc24/crc24.h
index 8e9ce9315..f80ee1c2a 100644
--- a/src/lib/hash/checksum/crc24/crc24.h
+++ b/src/lib/hash/checksum/crc24/crc24.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * 24-bit cyclic redundancy check
 */
-class BOTAN_DLL CRC24 : public HashFunction
+class BOTAN_DLL CRC24 final : public HashFunction
    {
    public:
       std::string name() const override { return "CRC24"; }
diff --git a/src/lib/hash/checksum/crc32/crc32.h b/src/lib/hash/checksum/crc32/crc32.h
index 98c9a020c..987f34608 100644
--- a/src/lib/hash/checksum/crc32/crc32.h
+++ b/src/lib/hash/checksum/crc32/crc32.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * 32-bit cyclic redundancy check
 */
-class BOTAN_DLL CRC32 : public HashFunction
+class BOTAN_DLL CRC32 final : public HashFunction
    {
    public:
       std::string name() const override { return "CRC32"; }