1 files changed, 6 insertions, 3 deletions
diff --git a/src/build_log.h b/src/build_log.h
index bb474fc..fc44854 100644
--- a/src/build_log.h
+++ b/src/build_log.h
@@ -25,7 +25,10 @@ using namespace std;
 
 struct Edge;
 
-struct IsDead {
+/// Can answer questions about the manifest for the BuildLog.
+struct BuildLogUser {
+  /// Return if a given output no longer part of the build manifest.
+  /// This is only called during recompaction and doesn't have to be fast.
   virtual bool IsPathDead(StringPiece s) = 0;
 };
 
@@ -40,7 +43,7 @@ struct BuildLog {
   BuildLog();
   ~BuildLog();
 
-  bool OpenForWrite(const string& path, IsDead* is_dead, string* err);  // XXX
+  bool OpenForWrite(const string& path, BuildLogUser& user, string* err);
   bool RecordCommand(Edge* edge, int start_time, int end_time,
                      TimeStamp restat_mtime = 0);
   void Close();
@@ -76,7 +79,7 @@ struct BuildLog {
   bool WriteEntry(FILE* f, const LogEntry& entry);
 
   /// Rewrite the known log entries, throwing away old data.
-  bool Recompact(const string& path, IsDead* is_dead, string* err);  // XXX
+  bool Recompact(const string& path, BuildLogUser& user, string* err);
 
   typedef ExternalStringHashMap<LogEntry*>::Type Entries;
   const Entries& entries() const { return entries_; }