Fix C++ compatibility issue

Remove deprecation warnings like

In file included from ../../server/char-device.cpp:28:
../../server/safe-list.hpp:108:43: error: 'template<class _Category, class _Tp, class _Distance, class _Pointer, class _Reference> struct std::iterator' is deprecated [-Werror=deprecated-declarations]
  108 | class safe_list<T>::iterator: public std::iterator<std::forward_iterator_tag, T>
      |                                           ^~~~~~~~

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/server/safe-list.hpp b/server/safe-list.hpp
index 960f21a3..77e2807c 100644
--- a/server/safe-list.hpp
+++ b/server/safe-list.hpp
@@ -105,11 +105,17 @@ public:
 };
 
 template <typename T>
-class safe_list<T>::iterator: public std::iterator<std::forward_iterator_tag, T>
+class safe_list<T>::iterator
 {
     typedef typename std::forward_list<T,Mallocator<T>>::iterator wrapped;
     wrapped curr, next;
 public:
+    using iterator_category = std::forward_iterator_tag;
+    using value_type = T;
+    using difference_type = ptrdiff_t;
+    using pointer = const value_type*;
+    using reference = const value_type&;
+
     iterator(wrapped init_curr) :
         curr(init_curr),
         next(init_curr != wrapped() ? ++init_curr : wrapped())