mirror of
https://github.com/classilla/tenfourfox.git
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257 lines
5.7 KiB
C++
257 lines
5.7 KiB
C++
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_STL_H_
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#define WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_STL_H_
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#include <list>
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#include "webrtc/system_wrappers/interface/constructor_magic.h"
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namespace webrtc {
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class ListItem {
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public:
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ListItem(const void* ptr);
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ListItem(const unsigned int item);
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virtual ~ListItem();
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void* GetItem() const;
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unsigned int GetUnsignedItem() const;
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private:
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friend class ListWrapper;
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mutable std::list<ListItem*>::iterator this_iter_;
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const void* item_ptr_;
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const unsigned int item_;
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DISALLOW_COPY_AND_ASSIGN(ListItem);
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};
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class ListWrapper {
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public:
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ListWrapper();
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~ListWrapper();
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// ListWrapper functions
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unsigned int GetSize() const;
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int PushBack(const void* ptr);
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int PushBack(const unsigned int item_id);
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int PushFront(const void* ptr);
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int PushFront(const unsigned int item_id);
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int PopFront();
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int PopBack();
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bool Empty() const;
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ListItem* First() const;
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ListItem* Last() const;
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ListItem* Next(ListItem* item) const;
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ListItem* Previous(ListItem* item) const;
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int Erase(ListItem* item);
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int Insert(ListItem* existing_previous_item, ListItem* new_item);
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int InsertBefore(ListItem* existing_next_item, ListItem* new_item);
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private:
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mutable std::list<ListItem*> list_;
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DISALLOW_COPY_AND_ASSIGN(ListWrapper);
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};
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#ifdef _LISTITEM_SRC
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ListItem::ListItem(const void* item)
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: this_iter_(),
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item_ptr_(item),
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item_(0) {
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}
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ListItem::ListItem(const unsigned int item)
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: this_iter_(),
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item_ptr_(0),
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item_(item) {
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}
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ListItem::~ListItem() {
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}
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void* ListItem::GetItem() const {
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return const_cast<void*>(item_ptr_);
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}
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unsigned int ListItem::GetUnsignedItem() const {
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return item_;
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}
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ListWrapper::ListWrapper()
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: list_() {
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}
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ListWrapper::~ListWrapper() {
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if (!Empty()) {
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// Remove all remaining list items.
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while (Erase(First()) == 0) {}
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}
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}
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bool ListWrapper::Empty() const {
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return list_.empty();
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}
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unsigned int ListWrapper::GetSize() const {
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return list_.size();
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}
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int ListWrapper::PushBack(const void* ptr) {
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ListItem* item = new ListItem(ptr);
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list_.push_back(item);
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return 0;
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}
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int ListWrapper::PushBack(const unsigned int item_id) {
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ListItem* item = new ListItem(item_id);
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list_.push_back(item);
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return 0;
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}
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int ListWrapper::PushFront(const unsigned int item_id) {
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ListItem* item = new ListItem(item_id);
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list_.push_front(item);
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return 0;
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}
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int ListWrapper::PushFront(const void* ptr) {
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ListItem* item = new ListItem(ptr);
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list_.push_front(item);
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return 0;
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}
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int ListWrapper::PopFront() {
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if (list_.empty()) {
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return -1;
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}
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list_.pop_front();
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return 0;
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}
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int ListWrapper::PopBack() {
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if (list_.empty()) {
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return -1;
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}
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list_.pop_back();
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return 0;
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}
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ListItem* ListWrapper::First() const {
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if (list_.empty()) {
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return NULL;
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}
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std::list<ListItem*>::iterator item_iter = list_.begin();
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ListItem* return_item = (*item_iter);
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return_item->this_iter_ = item_iter;
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return return_item;
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}
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ListItem* ListWrapper::Last() const {
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if (list_.empty()) {
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return NULL;
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}
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// std::list::end() addresses the last item + 1. Decrement so that the
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// actual last is accessed.
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std::list<ListItem*>::iterator item_iter = list_.end();
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--item_iter;
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ListItem* return_item = (*item_iter);
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return_item->this_iter_ = item_iter;
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return return_item;
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}
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ListItem* ListWrapper::Next(ListItem* item) const {
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if (item == NULL) {
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return NULL;
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}
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std::list<ListItem*>::iterator item_iter = item->this_iter_;
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++item_iter;
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if (item_iter == list_.end()) {
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return NULL;
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}
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ListItem* return_item = (*item_iter);
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return_item->this_iter_ = item_iter;
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return return_item;
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}
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ListItem* ListWrapper::Previous(ListItem* item) const {
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if (item == NULL) {
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return NULL;
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}
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std::list<ListItem*>::iterator item_iter = item->this_iter_;
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if (item_iter == list_.begin()) {
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return NULL;
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}
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--item_iter;
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ListItem* return_item = (*item_iter);
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return_item->this_iter_ = item_iter;
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return return_item;
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}
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int ListWrapper::Insert(ListItem* existing_previous_item,
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ListItem* new_item) {
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// Allow existing_previous_item to be NULL if the list is empty.
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// TODO(hellner) why allow this? Keep it as is for now to avoid
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// breaking API contract.
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if (!existing_previous_item && !Empty()) {
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return -1;
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}
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if (!new_item) {
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return -1;
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}
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std::list<ListItem*>::iterator insert_location = list_.begin();
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if (!Empty()) {
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insert_location = existing_previous_item->this_iter_;
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if (insert_location != list_.end()) {
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++insert_location;
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}
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}
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list_.insert(insert_location, new_item);
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return 0;
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}
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int ListWrapper::InsertBefore(ListItem* existing_next_item,
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ListItem* new_item) {
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// Allow existing_next_item to be NULL if the list is empty.
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// Todo: why allow this? Keep it as is for now to avoid breaking API
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// contract.
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if (!existing_next_item && !Empty()) {
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return -1;
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}
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if (!new_item) {
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return -1;
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}
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std::list<ListItem*>::iterator insert_location = list_.begin();
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if (!Empty()) {
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insert_location = existing_next_item->this_iter_;
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}
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list_.insert(insert_location, new_item);
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return 0;
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}
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int ListWrapper::Erase(ListItem* item) {
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if (item == NULL) {
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return -1;
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}
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list_.erase(item->this_iter_);
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return 0;
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}
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#endif
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} // namespace webrtc
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#endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_LIST_STL_H_
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