asn1,utils: add nlohmann json to/from json funcs for real_s

Author: Piotr Gawlowicz

include/srsran/asn1/asn1_json_utils.h

@@ -0,0 +1,38 @@
+/*
+ *
+ * Copyright 2021-2025 Software Radio Systems Limited
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the distribution.
+ *
+ */
+
+#pragma once
+
+#include "asn1_utils.h"
+#include "nlohmann/json.hpp"
+
+namespace asn1 {
+
+inline void to_json(nlohmann::json& out_j, const real_s& obj)
+{
+  out_j = obj.value;
+}
+
+inline void from_json(const nlohmann::json& in_j, real_s& obj)
+{
+  in_j.get_to(obj.value);
+}
+
+inline void to_json(nlohmann::ordered_json& out_j, const real_s& obj)
+{
+  out_j = obj.value;
+}
+
+inline void from_json(const nlohmann::ordered_json& in_j, real_s& obj)
+{
+  in_j.get_to(obj.value);
+}
+
+} // namespace asn1