1 files changed, 12 insertions, 4 deletions
diff --git a/klm/util/tokenize_piece.hh b/klm/util/tokenize_piece.hh
index 24eae8fb..908c8daf 100644
--- a/klm/util/tokenize_piece.hh
+++ b/klm/util/tokenize_piece.hh
@@ -1,5 +1,5 @@
-#ifndef UTIL_TOKENIZE_PIECE__
-#define UTIL_TOKENIZE_PIECE__
+#ifndef UTIL_TOKENIZE_PIECE_H
+#define UTIL_TOKENIZE_PIECE_H
 
 #include "util/exception.hh"
 #include "util/string_piece.hh"
@@ -7,7 +7,8 @@
 #include <boost/iterator/iterator_facade.hpp>
 
 #include <algorithm>
-#include <iostream>
+
+#include <string.h>
 
 namespace util {
 
@@ -71,6 +72,13 @@ class BoolCharacter {
       return StringPiece(in.data() + in.size(), 0);
     }
 
+    template <unsigned Length> static void Build(const char (&characters)[Length], bool (&out)[256]) {
+      memset(out, 0, sizeof(out));
+      for (const char *i = characters; i != characters + Length; ++i) {
+        out[static_cast<unsigned char>(*i)] = true;
+      }
+    }
+
   private:
     const bool *delimiter_;
 };
@@ -140,4 +148,4 @@ template <class Find, bool SkipEmpty = false> class TokenIter : public boost::it
 
 } // namespace util
 
-#endif // UTIL_TOKENIZE_PIECE__
+#endif // UTIL_TOKENIZE_PIECE_H