Add const qualifier for base_uint::size()

diff --git a/src/uint256.h b/src/uint256.h
index 82fd5ce..114ef89 100644 (file)
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -360,7 +360,7 @@ public:
         return std::vector<unsigned char>(begin(), end());
     }
 
-    size_t size()
+    size_t size() const
     {
         return sizeof(pn);
     }