From 243bcf6a6d678fbf6a5d13935e6f77e571836f3e Mon Sep 17 00:00:00 2001
From: Maxime Coste <mawww@kakoune.org>
Date: Tue, 27 Dec 2016 21:52:53 +0000
Subject: Support set -add on flag types

Fixes #1082
---
 src/enum.hh | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'src/enum.hh')

diff --git a/src/enum.hh b/src/enum.hh
index 6f4a4bdb..01f89b32 100644
--- a/src/enum.hh
+++ b/src/enum.hh
@@ -73,6 +73,15 @@ EnableIfWithoutBitOps<Enum> option_from_string(StringView str, Enum& e)
     e = it->value;
 }
 
+template<typename Flags, typename = decltype(enum_desc(Flags{}))>
+EnableIfWithBitOps<Flags, bool> option_add(Flags& opt, StringView str)
+{
+    Flags res = Flags{};
+    option_from_string(str, res);
+    opt |= res;
+    return res != (Flags)0;
+}
+
 }
 
 #endif // enum_hh_INCLUDED
-- 
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