1 files changed, 4 insertions, 0 deletions
diff --git a/lang/cpp/src/data.h b/lang/cpp/src/data.h
index ea394804..178bc309 100644
--- a/lang/cpp/src/data.h
+++ b/lang/cpp/src/data.h
@@ -27,6 +27,7 @@
 #include "key.h"
 
 #include <sys/types.h> // for size_t, off_t
+#include <cstdint> // unit64_t
 #include <cstdio> // FILE
 #include <algorithm>
 #include <memory>
@@ -125,6 +126,9 @@ public:
     /** See gpgme_data_set_flag */
     Error setFlag(const char *name, const char *value);
 
+    /** Set a size hint for this data e.g. for progress calculations. */
+    Error setSizeHint(uint64_t size);
+
     class Private;
     Private *impl()
     {