Add an assert.

diff --git a/src/lib/util.cc b/src/lib/util.cc
index 997470a210d9437d87efa81a8bf1e12a81e8d69e..7f6e9da5aff95feaee14a7cac247952d2e5cbd5d 100644 (file)
--- a/src/lib/util.cc
+++ b/src/lib/util.cc
@@ -598,6 +598,7 @@ digest_head_tail (vector<boost::filesystem::path> files, boost::uintmax_t size)
 string
 simple_digest (vector<boost::filesystem::path> paths)
 {
+       DCP_ASSERT(!paths.empty());
        return digest_head_tail(paths, 1000000) + raw_convert<string>(dcp::filesystem::file_size(paths.front()));
 }