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Change-Id: I4bf1707bd3dfeadf2c17b0a7daff372b1925ebbd

runtime/utilities/arrayref.h

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+/*
+ * Copyright (c) 2017, Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <cstddef>
+#include <type_traits>
+#include <utility>
+
+template <typename DataType>
+class ArrayRef {
+  public:
+    template <typename IteratorType>
+    ArrayRef(IteratorType b, IteratorType e)
+        : b(&*b), e(&*(e - 1) + 1) {
+    }
+
+    template <typename IteratorType>
+    ArrayRef(IteratorType b, size_t s)
+        : ArrayRef(b, b + s) {
+    }
+
+    template <typename SequentialContainerType>
+    ArrayRef(SequentialContainerType &ctr)
+        : b(&*ctr.begin()), e(&*(ctr.end() - 1) + 1) {
+    }
+
+    template <size_t Size>
+    ArrayRef(DataType (&array)[Size])
+        : b(&array[0]), e(&array[Size]) {
+    }
+
+    ArrayRef()
+        : b(0), e(0) {
+    }
+
+    size_t size() const {
+        return e - b;
+    }
+
+    DataType &operator[](std::size_t idx) {
+        return b[idx];
+    }
+
+    const DataType &operator[](std::size_t idx) const {
+        return b[idx];
+    }
+
+    DataType *begin() {
+        return b;
+    }
+
+    const DataType *begin() const {
+        return b;
+    }
+
+    DataType *end() {
+        return e;
+    }
+
+    const DataType *end() const {
+        return e;
+    }
+
+    void swap(ArrayRef &rhs) {
+        std::swap(b, rhs.b);
+        std::swap(e, rhs.e);
+    }
+
+    operator ArrayRef<const DataType>() {
+        return ArrayRef<const DataType>(b, e);
+    }
+
+  private:
+    DataType *b;
+    DataType *e;
+};