update nlohmann modernjson to v3.4 (with bson support)

1 files changed, 12 insertions, 6 deletions

diff --git a/include/lib/modernjson/detail/json_ref.hpp b/include/lib/modernjson/detail/json_ref.hpp
index 8285be2..c44aa66 100644
--- a/include/lib/modernjson/detail/json_ref.hpp
+++ b/include/lib/modernjson/detail/json_ref.hpp
@@ -3,6 +3,8 @@
 #include <initializer_list>
 #include <utility>
 
+#include <lib/modernjson/detail/meta/type_traits.hpp>
+
 namespace nlohmann
 {
 namespace detail
@@ -25,15 +27,19 @@ class json_ref
         : owned_value(init), value_ref(&owned_value), is_rvalue(true)
     {}
 
-    template<class... Args>
-    json_ref(Args&& ... args)
-        : owned_value(std::forward<Args>(args)...), value_ref(&owned_value), is_rvalue(true)
-    {}
+    template <
+        class... Args,
+        enable_if_t<std::is_constructible<value_type, Args...>::value, int> = 0 >
+    json_ref(Args && ... args)
+        : owned_value(std::forward<Args>(args)...), value_ref(&owned_value),
+          is_rvalue(true) {}
 
     // class should be movable only
     json_ref(json_ref&&) = default;
     json_ref(const json_ref&) = delete;
     json_ref& operator=(const json_ref&) = delete;
+    json_ref& operator=(json_ref&&) = delete;
+    ~json_ref() = default;
 
     value_type moved_or_copied() const
     {
@@ -59,5 +65,5 @@ class json_ref
     value_type* value_ref = nullptr;
     const bool is_rvalue;
 };
-}
-}
+}  // namespace detail
+}  // namespace nlohmann