From 2ede341d59b4ab259caf808dfa65c0ac380ba347 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 8 Mar 2022 10:57:52 +0200
Subject: Improve performance of update during match for multiple targets

---
 libbuild2/target-state.hxx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'libbuild2/target-state.hxx')

diff --git a/libbuild2/target-state.hxx b/libbuild2/target-state.hxx
index 3457b13..48d683d 100644
--- a/libbuild2/target-state.hxx
+++ b/libbuild2/target-state.hxx
@@ -18,9 +18,11 @@ namespace build2
   // Note that postponed is "greater" than unchanged since it may result in
   // the changed state.
   //
+  // Note also that value 0 is available to indicate absent/invalid state.
+  //
   enum class target_state: uint8_t
   {
-    unknown,
+    unknown = 1,
     unchanged,
     postponed,
     busy,
-- 
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