From 37892b11a45edcb73aa75ca671f30233f32b914b Mon Sep 17 00:00:00 2001
From: Gali Nelle <galinelle.mapbox@gmail.com>
Date: Fri, 11 Feb 2022 11:58:00 +0200
Subject: [PATCH] Add hash function for null_value_t

This will make feature::identifier hashable
---
 include/mapbox/feature.hpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/mapbox/feature.hpp b/include/mapbox/feature.hpp
index 68b23f8..512367e 100644
--- a/include/mapbox/feature.hpp
+++ b/include/mapbox/feature.hpp
@@ -222,3 +222,14 @@ struct feature_collection : Cont<feature<T>>
 
 } // namespace feature
 } // namespace mapbox
+
+namespace std {
+template <>
+struct hash<mapbox::feature::null_value_t>
+{
+    size_t operator()(const mapbox::feature::null_value_t&) const
+    {
+        return 779711298111120;
+    }
+};
+} // namespace std