Add compile-time check for input iterators in ::wire array writing

1 files changed, 8 insertions, 1 deletions

diff --git a/contrib/epee/include/serialization/wire/write.h b/contrib/epee/include/serialization/wire/write.h
index c18f7dbcc..c2359918c 100644
--- a/contrib/epee/include/serialization/wire/write.h
+++ b/contrib/epee/include/serialization/wire/write.h
@@ -30,6 +30,7 @@
 #include <boost/utility/string_ref.hpp>
 #include <boost/range/size.hpp>
 #include <cstdint>
+#include <iterator>
 #include <system_error>
 #include <type_traits>
 
@@ -188,7 +189,13 @@ namespace wire_write
 
   template<typename T>
   inline std::size_t array_size(std::true_type, const T& source)
-  { return boost::size(source); }
+  {
+    static_assert(
+      !std::is_same<typename std::iterator_traits<typename T::const_iterator>::iterator_category, std::input_iterator_tag>{},
+      "Input iterators must use json (or similar) derived classes directly"
+    );
+    return boost::size(source);
+  }
 
   template<typename T>
   inline constexpr std::size_t array_size(std::false_type, const T&) noexcept