add CRYPTOPP_NO_VTABLE

1 files changed, 3 insertions, 3 deletions

diff --git a/twofish.h b/twofish.h
index 820a438d..d1edfb7c 100644
--- a/twofish.h
+++ b/twofish.h
@@ -17,7 +17,7 @@ struct Twofish_Info : public FixedBlockSize<16>, public VariableKeyLength<16, 0,
 /// <a href="http://www.weidai.com/scan-mirror/cs.html#Twofish">Twofish</a>
 class Twofish : public Twofish_Info, public BlockCipherDocumentation
 {
-	class Base : public BlockCipherBaseTemplate<Twofish_Info>
+	class CRYPTOPP_NO_VTABLE Base : public BlockCipherBaseTemplate<Twofish_Info>
 	{
 	public:
 		void UncheckedSetKey(CipherDir direction, const byte *userKey, unsigned int length);
@@ -33,13 +33,13 @@ class Twofish : public Twofish_Info, public BlockCipherDocumentation
 		FixedSizeSecBlock<word32[256], 4> m_s;
 	};
 
-	class Enc : public Base
+	class CRYPTOPP_NO_VTABLE Enc : public Base
 	{
 	public:
 		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
 	};
 
-	class Dec : public Base
+	class CRYPTOPP_NO_VTABLE Dec : public Base
 	{
 	public:
 		void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;