add missing Ref() function

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@216 57ff6487-cd31-0410-9ec3-f628ee90f5f0

1 files changed, 5 insertions, 0 deletions

diff --git a/cryptlib.h b/cryptlib.h
index 9b17323..46ac0be 100644
--- a/cryptlib.h
+++ b/cryptlib.h
@@ -521,6 +521,11 @@ public:
 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE HashTransformation : public Algorithm
 {
 public:
+	//! return a reference to this object, 
+	/*! This function is useful for passing a temporary HashTransformation object to a 
+		function that takes a non-const reference. */
+	HashTransformation& Ref() {return *this;}
+
 	//! process more input
 	virtual void Update(const byte *input, size_t length) =0;