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-rw-r--r--build2/version/snapshot.hxx33
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diff --git a/build2/version/snapshot.hxx b/build2/version/snapshot.hxx
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+// file : build2/version/snapshot.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef BUILD2_VERSION_SNAPSHOT_HXX
+#define BUILD2_VERSION_SNAPSHOT_HXX
+
+#include <build2/types.hxx>
+#include <build2/utility.hxx>
+
+#include <build2/scope.hxx>
+
+namespace build2
+{
+ namespace version
+ {
+ struct snapshot
+ {
+ uint64_t sn = 0;
+ string id;
+
+ bool
+ empty () const {return sn == 0;}
+ };
+
+ // Return empty snapshot if unknown scm or uncommitted.
+ //
+ snapshot
+ extract_snapshot (const scope& rs);
+ }
+}
+
+#endif // BUILD2_VERSION_SNAPSHOT_HXX