Have 4 template parameters for ordered_map

include/nlohmann/ordered_map.hpp

@@ -11,10 +11,10 @@ namespace nlohmann
 /// ordered_map: a minimal map-like container that preserves insertion order
 /// for use within nlohmann::basic_json<ordered_map>
 template <class Key, class T, class IgnoredLess = std::less<Key>,
-          class Allocator = std::allocator<std::pair<const Key, T>>,
-          class Container = std::vector<std::pair<const Key, T>, Allocator>>
-struct ordered_map : Container
+          class Allocator = std::allocator<std::pair<const Key, T>>>
+struct ordered_map : std::vector<typename Allocator::value_type, Allocator>
 {
+    using Container = std::vector<typename Allocator::value_type, Allocator>;
     using key_type = Key;
     using mapped_type = T;
     using typename Container::iterator;

single_include/nlohmann/json.hpp

@@ -2773,7 +2773,7 @@ uses the standard template types.
 */
 using json = basic_json<>;
 
-template<class Key, class T, class IgnoredLess, class Allocator, class Container>
+template<class Key, class T, class IgnoredLess, class Allocator>
 struct ordered_map;
 
 /*!
@@ -15880,10 +15880,10 @@ namespace nlohmann
 /// ordered_map: a minimal map-like container that preserves insertion order
 /// for use within nlohmann::basic_json<ordered_map>
 template <class Key, class T, class IgnoredLess = std::less<Key>,
-          class Allocator = std::allocator<std::pair<const Key, T>>,
-          class Container = std::vector<std::pair<const Key, T>, Allocator>>
-struct ordered_map : Container
+          class Allocator = std::allocator<std::pair<const Key, T>>>
+struct ordered_map : std::vector<typename Allocator::value_type, Allocator>
 {
+    using Container = std::vector<typename Allocator::value_type, Allocator>;
     using key_type = Key;
     using mapped_type = T;
     using typename Container::iterator;