1 files changed, 48 insertions, 0 deletions
diff --git a/include/gudhi/Null_output_iterator.h b/include/gudhi/Null_output_iterator.h
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+++ b/include/gudhi/Null_output_iterator.h
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+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Author(s):       Marc Glisse
+ *
+ *    Copyright (C) 2017  INRIA
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation, either version 3 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NULL_OUTPUT_ITERATOR_H_
+#define NULL_OUTPUT_ITERATOR_H_
+
+#include <iterator>
+
+namespace Gudhi {
+
+/** An output iterator that ignores whatever it is given. */
+struct Null_output_iterator {
+  typedef std::output_iterator_tag iterator_category;
+  typedef void                     value_type;
+  typedef void                     difference_type;
+  typedef void                     pointer;
+  typedef void                     reference;
+
+  Null_output_iterator& operator++() {return *this;}
+  Null_output_iterator operator++(int) {return *this;}
+  struct proxy {
+    template<class T>
+    proxy& operator=(T&&){return *this;}
+  };
+  proxy operator*()const{return {};}
+};
+}  // namespace Gudhi
+
+#endif  // NULL_OUTPUT_ITERATOR_H_