buffer.h: Add empty constructor to contigous_filler

This is useful to have ability to create a contigous_filler variable.
Otherwise one needs std::optional<>.

Signed-off-by: Adam Kupczyk <akupczyk@ibm.com>

diff --git a/src/include/buffer.h b/src/include/buffer.h
index d8f4f306cc38df14a5cfc2e37887170dd0c3cd6b..c63a1847dcfca1a06ceee20f1205e8e88c2a85b7 100644 (file)
--- a/src/include/buffer.h
+++ b/src/include/buffer.h
@@ -834,6 +834,7 @@ struct error_code;
       contiguous_filler(char* const pos) : pos(pos) {}
 
     public:
+      contiguous_filler() : pos(nullptr) {}
       void advance(const unsigned len) {
        pos += len;
       }