1 files changed, 14 insertions, 0 deletions
diff --git a/src/libutil/json-impls.hh b/src/libutil/json-impls.hh
new file mode 100644
index 000000000..bd75748ad
--- /dev/null
+++ b/src/libutil/json-impls.hh
@@ -0,0 +1,14 @@
+#pragma once
+
+#include "nlohmann/json_fwd.hpp"
+
+// Following https://github.com/nlohmann/json#how-can-i-use-get-for-non-default-constructiblenon-copyable-types
+#define JSON_IMPL(TYPE)                                                \
+    namespace nlohmann {                                               \
+        using namespace nix;                                           \
+        template <>                                                    \
+        struct adl_serializer<TYPE> {                                  \
+            static TYPE from_json(const json & json);                  \
+            static void to_json(json & json, TYPE t);                  \
+        };                                                             \
+    }