From b9b18196d9b31165191068e1e3db3950d6883b86 Mon Sep 17 00:00:00 2001
From: Ben Webb <ben@salilab.org>
Date: Wed, 31 Jan 2024 12:07:21 -0800
Subject: [PATCH] Force cereal for serializing boost::unordered_map

As of Boost 1.84, Boost provides its own serialize
method for unordered_map (to work with Boost.Serialize).
This conflicts with cereal's own functions which we
previously relied upon. Force use of the cereal
functions to remove this ambiguity.
---
 modules/kernel/include/set_map_macros.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/modules/kernel/include/set_map_macros.h b/modules/kernel/include/set_map_macros.h
index df95dc5d4b..66d6265075 100644
--- a/modules/kernel/include/set_map_macros.h
+++ b/modules/kernel/include/set_map_macros.h
@@ -54,6 +54,14 @@
 #define IMP_KERNEL_LARGE_UNORDERED_SET boost::unordered_set
 #define IMP_KERNEL_LARGE_UNORDERED_MAP boost::unordered_map
 
+// Use cereal's own functions to serialize unordered_map, not those
+// provided (for Boost.Serialize) in newer Boost versions
+namespace cereal {
+  template<class Archive, class Key, class T>
+    struct specialize<Archive, boost::unordered_map<Key, T>,
+                      cereal::specialization::non_member_load_save> {};
+}
+
 #if defined(_MSC_VER) && _MSC_VER <= 1500
 #include <set>                      // IWYU pragma: export
 #include <map>                      // IWYU pragma: export