From 53105890d75789c81adbb3d781eff9ebd7110222 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 1 Sep 2017 17:33:44 +0200
Subject: Add support for try_match(), use to handle deleted headers

---
 build2/depdb.hxx | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'build2/depdb.hxx')

diff --git a/build2/depdb.hxx b/build2/depdb.hxx
index da45a4a..520642e 100644
--- a/build2/depdb.hxx
+++ b/build2/depdb.hxx
@@ -144,6 +144,11 @@ namespace build2
     void
     write (char, bool nl = true);
 
+    // Mark the previously read line as to be overwritte.
+    //
+    void
+    write () {if (state_ != state::write) change ();}
+
     // Read the next line and compare it to the expected value. If it matches,
     // return NULL. Otherwise, overwrite it and return the old value (which
     // could also be NULL). This strange-sounding result semantics is used to
-- 
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