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diff --git a/storage/mroonga/vendor/groonga/lib/dat/array.hpp b/storage/mroonga/vendor/groonga/lib/dat/array.hpp
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+++ b/storage/mroonga/vendor/groonga/lib/dat/array.hpp
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+/* -*- c-basic-offset: 2 -*- */
+/*
+  Copyright(C) 2011-2016 Brazil
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License version 2.1 as published by the Free Software Foundation.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1335  USA
+*/
+
+#pragma once
+
+#include "dat.hpp"
+
+namespace grn {
+namespace dat {
+
+// This class is used to detect an out-of-range access in debug mode.
+template <typename T>
+class GRN_DAT_API Array {
+ public:
+  Array() : ptr_(NULL), size_(0) {}
+  Array(void *ptr, UInt32 size) : ptr_(static_cast<T *>(ptr)), size_(size) {
+    GRN_DAT_DEBUG_THROW_IF((ptr == NULL) && (size != 0));
+  }
+  template <UInt32 U>
+  explicit Array(T (&array)[U]) : ptr_(array), size_(U) {}
+  ~Array() {}
+
+  const T &operator[](UInt32 i) const {
+    GRN_DAT_DEBUG_THROW_IF(i >= size_);
+    return ptr_[i];
+  }
+  T &operator[](UInt32 i) {
+    GRN_DAT_DEBUG_THROW_IF(i >= size_);
+    return ptr_[i];
+  }
+
+  const T *begin() const {
+    return ptr();
+  }
+  T *begin() {
+    return ptr();
+  }
+
+  const T *end() const {
+    return ptr() + size();
+  }
+  T *end() {
+    return ptr() + size();
+  }
+
+  void assign(void *ptr, UInt32 size) {
+    GRN_DAT_DEBUG_THROW_IF((ptr == NULL) && (size != 0));
+    ptr_ = static_cast<T *>(ptr);
+    size_ = size;
+  }
+  template <UInt32 U>
+  void assign(T (&array)[U]) {
+    assign(array, U);
+  }
+
+  void swap(Array *rhs) {
+    T * const temp_ptr = ptr_;
+    ptr_ = rhs->ptr_;
+    rhs->ptr_ = temp_ptr;
+
+    const UInt32 temp_size = size_;
+    size_ = rhs->size_;
+    rhs->size_ = temp_size;
+  }
+
+  T *ptr() const {
+    return ptr_;
+  }
+  UInt32 size() const {
+    return size_;
+  }
+
+ private:
+  T *ptr_;
+  UInt32 size_;
+
+  // Disallows copy and assignment.
+  Array(const Array &);
+  Array &operator=(const Array &);
+};
+
+}  // namespace dat
+}  // namespace grn