1 files changed, 69 insertions, 0 deletions
diff --git a/libs/util/include/util/feature/IndexIterator.h b/libs/util/include/util/feature/IndexIterator.h
new file mode 100644
index 000000000..dd029f4b6
--- /dev/null
+++ b/libs/util/include/util/feature/IndexIterator.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __NNFW_UTIL_FEATURE_INDEX_ITERATOR_H__
+#define __NNFW_UTIL_FEATURE_INDEX_ITERATOR_H__
+
+#include "util/feature/Shape.h"
+
+namespace nnfw
+{
+namespace util
+{
+namespace feature
+{
+
+class IndexIterator
+{
+public:
+  IndexIterator(const Shape &shape) : _shape{shape}
+  {
+    // DO NOTHING
+  }
+
+public:
+  template <typename Callable> IndexIterator &iter(Callable cb)
+  {
+    for (uint32_t ch = 0; ch < _shape.C; ++ch)
+    {
+      for (uint32_t row = 0; row < _shape.H; ++row)
+      {
+        for (uint32_t col = 0; col < _shape.W; ++col)
+        {
+          cb(ch, row, col);
+        }
+      }
+    }
+
+    return (*this);
+  }
+
+private:
+  const Shape _shape;
+};
+
+IndexIterator iterate(const Shape &shape) { return IndexIterator{shape}; }
+
+template <typename Callable> IndexIterator &operator<<(IndexIterator &&it, Callable cb)
+{
+  return it.iter(cb);
+}
+
+} // namespace feature
+} // namespace util
+} // namespace nnfw
+
+#endif // __NNFW_UTIL_FEATURE_INDEX_ITERATOR_H__