From c1c17962d1c4bad594dae63243e9b4e5a0fb0dc3 Mon Sep 17 00:00:00 2001
From: Jeeyong Um <conr2d@gmail.com>
Date: Wed, 4 Sep 2019 03:42:21 +0000
Subject: [PATCH] Add missing operator < for permission_level

---
 libraries/eosiolib/contracts/eosio/action.hpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libraries/eosiolib/contracts/eosio/action.hpp b/libraries/eosiolib/contracts/eosio/action.hpp
index 755a6c2121..85ca78edb4 100644
--- a/libraries/eosiolib/contracts/eosio/action.hpp
+++ b/libraries/eosiolib/contracts/eosio/action.hpp
@@ -213,6 +213,18 @@ namespace eosio {
          return std::tie( a.actor, a.permission ) == std::tie( b.actor, b.permission );
       }
 
+      /**
+       * Lexicographically compares two permissions
+       *
+       * @param a - first permission to compare
+       * @param b - second permission to compare
+       * @return true if a < b
+       * @return false if a >= b
+       */
+      friend constexpr bool operator < ( const permission_level& a, const permission_level& b ) {
+         return std::tie( a.actor, a.permission ) < std::tie( b.actor, b.permission );
+      }
+
       EOSLIB_SERIALIZE( permission_level, (actor)(permission) )
    };