Cleanup: remove unnecessary namespace.

diff --git a/src/asset.cc b/src/asset.cc
index b69e68e8589d53c7e3e94cd09bee8525e5fdb5d8..14aec0dd2cf1a912da65f7b60d6a0d1cfb6ed19b 100644 (file)
--- a/src/asset.cc
+++ b/src/asset.cc
@@ -158,7 +158,7 @@ void
 Asset::set_file (path file) const
 {
        _file = absolute (file);
-       _hash = boost::optional<string>();
+       _hash = optional<string>();
 }