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+// Copyright 2010 Google Inc. All Rights Reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// static_map_iterator.h: StaticMapIterator template class declaration.
+//
+// StaticMapIterator provides increment and decrement operators to iterate
+// through a StaticMap map.  It does not provide *, -> operators, user should
+// use GetKeyPtr(), GetKey(), GetValuePtr() interfaces to retrieve data or
+// pointer to data.  StaticMapIterator is essentially a const_iterator.
+//
+// Author: Siyang Xie (lambxsy@google.com)
+
+
+#ifndef PROCESSOR_STATIC_MAP_ITERATOR_H__
+#define PROCESSOR_STATIC_MAP_ITERATOR_H__
+
+#include "google_breakpad/common/breakpad_types.h"
+
+namespace google_breakpad {
+
+// Forward declaration.
+template<typename Key, typename Value, typename Compare> class StaticMap;
+
+// StaticMapIterator does not support operator*() or operator->(),
+// User should use GetKey(), GetKeyPtr(), GetValuePtr() instead;
+template<typename Key, typename Value, typename Compare>
+class StaticMapIterator {
+ public:
+  // Constructors.
+  StaticMapIterator(): index_(-1), base_(NULL) { }
+
+  // Increment & Decrement operators:
+  StaticMapIterator& operator++();
+  StaticMapIterator operator++(int post_fix_operator);
+
+  StaticMapIterator& operator--();
+  StaticMapIterator operator--(int post_fix_operator);
+
+  // Interface for retrieving data / pointer to data.
+  const Key* GetKeyPtr() const;
+
+  // Run time error will occur if GetKey() is called on an invalid iterator.
+  inline const Key GetKey() const { return *GetKeyPtr(); }
+
+  // return a raw memory pointer that points to the start address of value.
+  const char* GetValueRawPtr() const;
+
+  // return a reinterpret-casted pointer to the value.
+  inline const Value* GetValuePtr() const {
+    return reinterpret_cast<const Value*>(GetValueRawPtr());
+  }
+
+  bool operator==(const StaticMapIterator& x) const;
+  bool operator!=(const StaticMapIterator& x) const;
+
+  // Check if this iterator is valid.
+  // If iterator is invalid, user is forbidden to use ++/-- operator
+  // or interfaces for retrieving data / pointer to data.
+  bool IsValid() const;
+
+ private:
+  friend class StaticMap<Key, Value, Compare>;
+
+  // Only StaticMap can call this constructor.
+  explicit StaticMapIterator(const char* base, const int32_t &index);
+
+  // Index of node that the iterator is pointing to.
+  int32_t index_;
+
+  // Beginning address of the serialized map data.
+  const char* base_;
+
+  // Number of nodes in the map.  Use it to identify end() iterator.
+  int32_t num_nodes_;
+
+  // offsets_ is an array of offset addresses of mapped values.
+  // For example:
+  // address_of_i-th_node_value = base_ + offsets_[i]
+  const uint32_t* offsets_;
+
+  // keys_[i] = key of i_th node.
+  const Key* keys_;
+};
+
+}  // namespace google_breakpad
+
+#endif  // PROCESSOR_STATIC_MAP_ITERATOR_H__