From 817562e6946fa44c253beb76a36d85b55fd9c14d Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 14 Sep 2021 19:05:28 +0200
Subject: Add "nix profile rollback" command

---
 src/libutil/args.hh | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/libutil')

diff --git a/src/libutil/args.hh b/src/libutil/args.hh
index 22c94b501..7521b3065 100644
--- a/src/libutil/args.hh
+++ b/src/libutil/args.hh
@@ -91,6 +91,14 @@ protected:
               })
             , arity(1)
         { }
+
+        template<class I>
+        Handler(std::optional<I> * dest)
+            : fun([=](std::vector<std::string> ss) {
+                *dest = string2IntWithUnitPrefix<I>(ss[0]);
+            })
+            , arity(1)
+        { }
     };
 
     /* Options. */
-- 
cgit v1.2.3