From bd1cd53b2a85fa073244efef0a48b24b0d176dae Mon Sep 17 00:00:00 2001
From: Asias He <asias@scylladb.com>
Date: Mon, 12 Dec 2016 16:18:37 +0800
Subject: [PATCH] repair: Add hash specialization for partition_checksum

So we can store partition_checksum in std::map as key.
---
 repair/repair.hh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/repair/repair.hh b/repair/repair.hh
index 55b586a597..7b42dc0308 100644
--- a/repair/repair.hh
+++ b/repair/repair.hh
@@ -108,3 +108,14 @@ public:
 future<partition_checksum> checksum_range(seastar::sharded<database> &db,
         const sstring& keyspace, const sstring& cf,
         const ::nonwrapping_range<dht::token>& range, repair_checksum rt);
+
+namespace std {
+template<>
+struct hash<partition_checksum> {
+    size_t operator()(partition_checksum sum) const {
+        size_t h = 0;
+        std::copy_n(sum.digest().begin(), std::min(sizeof(size_t), sizeof(sum.digest())), reinterpret_cast<uint8_t*>(&h));
+        return h;
+    }
+};
+}