11be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Copyright 2003 Google Inc. 21be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// All rights reserved. 31be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 41be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Redistribution and use in source and binary forms, with or without 51be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// modification, are permitted provided that the following conditions are 61be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// met: 71be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 81be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// * Redistributions of source code must retain the above copyright 91be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// notice, this list of conditions and the following disclaimer. 101be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// * Redistributions in binary form must reproduce the above 111be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// copyright notice, this list of conditions and the following disclaimer 121be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// in the documentation and/or other materials provided with the 131be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// distribution. 141be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// * Neither the name of Google Inc. nor the names of its 151be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// contributors may be used to endorse or promote products derived from 161be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// this software without specific prior written permission. 171be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 181be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 191be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 201be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 211be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 221be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 231be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 241be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 251be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 261be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 271be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 281be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 291be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 301be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Authors: Dan Egnor (egnor@google.com) 311be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 321be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// A "smart" pointer type with reference tracking. Every pointer to a 331be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// particular object is kept on a circular linked list. When the last pointer 341be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// to an object is destroyed or reassigned, the object is deleted. 351be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 361be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Used properly, this deletes the object when the last reference goes away. 371be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// There are several caveats: 381be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// - Like all reference counting schemes, cycles lead to leaks. 391be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// - Each smart pointer is actually two pointers (8 bytes instead of 4). 401be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// - Every time a pointer is assigned, the entire list of pointers to that 411be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// object is traversed. This class is therefore NOT SUITABLE when there 421be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// will often be more than two or three pointers to a particular object. 431be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// - References are only tracked as long as linked_ptr<> objects are copied. 441be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// If a linked_ptr<> is converted to a raw pointer and back, BAD THINGS 451be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// will happen (double deletion). 461be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 471be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// A good use of this class is storing object references in STL containers. 481be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// You can safely put linked_ptr<> in a vector<>. 491be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Other uses may not be as good. 501be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 511be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Note: If you use an incomplete type with linked_ptr<>, the class 521be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// *containing* linked_ptr<> must have a constructor and destructor (even 531be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// if they do nothing!). 541be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 551be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Bill Gibbons suggested we use something like this. 561be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 571be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Thread Safety: 581be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Unlike other linked_ptr implementations, in this implementation 591be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// a linked_ptr object is thread-safe in the sense that: 601be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// - it's safe to copy linked_ptr objects concurrently, 611be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// - it's safe to copy *from* a linked_ptr and read its underlying 621be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// raw pointer (e.g. via get()) concurrently, and 631be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// - it's safe to write to two linked_ptrs that point to the same 641be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// shared object concurrently. 651be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// TODO(wan@google.com): rename this to safe_linked_ptr to avoid 661be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// confusion with normal linked_ptr. 671be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 681be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 691be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 701be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 711be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania#include <stdlib.h> 721be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania#include <assert.h> 731be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 7441d0579e8de9ef4ff178fc4991043c61a19943f7Brett Chabot#include "gtest/internal/gtest-port.h" 751be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 761be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catanianamespace testing { 771be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catanianamespace internal { 781be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 791be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Protects copying of all linked_ptr objects. 8041d0579e8de9ef4ff178fc4991043c61a19943f7Brett ChabotGTEST_API_ GTEST_DECLARE_STATIC_MUTEX_(g_linked_ptr_mutex); 811be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 821be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// This is used internally by all instances of linked_ptr<>. It needs to be 831be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// a non-template class because different types of linked_ptr<> can refer to 841be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// the same object (linked_ptr<Superclass>(obj) vs linked_ptr<Subclass>(obj)). 851be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// So, it needs to be possible for different types of linked_ptr to participate 861be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// in the same circular linked list, so we need a single class type here. 871be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// 881be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// DO NOT USE THIS CLASS DIRECTLY YOURSELF. Use linked_ptr<T>. 891be2c9def7187e4e643c00a31dd9986395795d7dNicolas Cataniaclass linked_ptr_internal { 901be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania public: 911be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Create a new circle that includes only this instance. 921be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania void join_new() { 931be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania next_ = this; 941be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 951be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 961be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Many linked_ptr operations may change p.link_ for some linked_ptr 971be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // variable p in the same circle as this object. Therefore we need 981be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // to prevent two such operations from occurring concurrently. 991be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // 1001be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Note that different types of linked_ptr objects can coexist in a 1011be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // circle (e.g. linked_ptr<Base>, linked_ptr<Derived1>, and 1021be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // linked_ptr<Derived2>). Therefore we must use a single mutex to 1031be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // protect all linked_ptr objects. This can create serious 1041be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // contention in production code, but is acceptable in a testing 1051be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // framework. 1061be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1071be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Join an existing circle. 108fc2de66453b0669c09eaca643b07d34443858b6fElliott Hughes void join(linked_ptr_internal const* ptr) 109fc2de66453b0669c09eaca643b07d34443858b6fElliott Hughes GTEST_LOCK_EXCLUDED_(g_linked_ptr_mutex) { 1101be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania MutexLock lock(&g_linked_ptr_mutex); 1111be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1121be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania linked_ptr_internal const* p = ptr; 1131be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania while (p->next_ != ptr) p = p->next_; 1141be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania p->next_ = this; 1151be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania next_ = ptr; 1161be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1171be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1181be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Leave whatever circle we're part of. Returns true if we were the 1191be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // last member of the circle. Once this is done, you can join() another. 120fc2de66453b0669c09eaca643b07d34443858b6fElliott Hughes bool depart() 121fc2de66453b0669c09eaca643b07d34443858b6fElliott Hughes GTEST_LOCK_EXCLUDED_(g_linked_ptr_mutex) { 1221be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania MutexLock lock(&g_linked_ptr_mutex); 1231be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1241be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania if (next_ == this) return true; 1251be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania linked_ptr_internal const* p = next_; 1261be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania while (p->next_ != this) p = p->next_; 1271be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania p->next_ = next_; 1281be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania return false; 1291be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1301be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1311be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania private: 1321be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania mutable linked_ptr_internal const* next_; 1331be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania}; 1341be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1351be2c9def7187e4e643c00a31dd9986395795d7dNicolas Cataniatemplate <typename T> 1361be2c9def7187e4e643c00a31dd9986395795d7dNicolas Cataniaclass linked_ptr { 1371be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania public: 1381be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania typedef T element_type; 1391be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1401be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Take over ownership of a raw pointer. This should happen as soon as 1411be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // possible after the object is created. 1421be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania explicit linked_ptr(T* ptr = NULL) { capture(ptr); } 1431be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania ~linked_ptr() { depart(); } 1441be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1451be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Copy an existing linked_ptr<>, adding ourselves to the list of references. 1461be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania template <typename U> linked_ptr(linked_ptr<U> const& ptr) { copy(&ptr); } 1471be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania linked_ptr(linked_ptr const& ptr) { // NOLINT 1481be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania assert(&ptr != this); 1491be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania copy(&ptr); 1501be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1511be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1521be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Assignment releases the old value and acquires the new. 1531be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania template <typename U> linked_ptr& operator=(linked_ptr<U> const& ptr) { 1541be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania depart(); 1551be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania copy(&ptr); 1561be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania return *this; 1571be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1581be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1591be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania linked_ptr& operator=(linked_ptr const& ptr) { 1601be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania if (&ptr != this) { 1611be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania depart(); 1621be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania copy(&ptr); 1631be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1641be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania return *this; 1651be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1661be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1671be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania // Smart pointer members. 1681be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania void reset(T* ptr = NULL) { 1691be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania depart(); 1701be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania capture(ptr); 1711be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1721be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania T* get() const { return value_; } 1731be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania T* operator->() const { return value_; } 1741be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania T& operator*() const { return *value_; } 1751be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1761be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania bool operator==(T* p) const { return value_ == p; } 1771be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania bool operator!=(T* p) const { return value_ != p; } 1781be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania template <typename U> 1791be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania bool operator==(linked_ptr<U> const& ptr) const { 1801be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania return value_ == ptr.get(); 1811be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1821be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania template <typename U> 1831be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania bool operator!=(linked_ptr<U> const& ptr) const { 1841be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania return value_ != ptr.get(); 1851be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1861be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1871be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania private: 1881be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania template <typename U> 1891be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania friend class linked_ptr; 1901be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1911be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania T* value_; 1921be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania linked_ptr_internal link_; 1931be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1941be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania void depart() { 1951be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania if (link_.depart()) delete value_; 1961be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 1971be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 1981be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania void capture(T* ptr) { 1991be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania value_ = ptr; 2001be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania link_.join_new(); 2011be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 2021be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 2031be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania template <typename U> void copy(linked_ptr<U> const* ptr) { 2041be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania value_ = ptr->get(); 2051be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania if (value_) 2061be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania link_.join(&ptr->link_); 2071be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania else 2081be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania link_.join_new(); 2091be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania } 2101be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania}; 2111be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 2121be2c9def7187e4e643c00a31dd9986395795d7dNicolas Cataniatemplate<typename T> inline 2131be2c9def7187e4e643c00a31dd9986395795d7dNicolas Cataniabool operator==(T* ptr, const linked_ptr<T>& x) { 2141be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania return ptr == x.get(); 2151be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania} 2161be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 2171be2c9def7187e4e643c00a31dd9986395795d7dNicolas Cataniatemplate<typename T> inline 2181be2c9def7187e4e643c00a31dd9986395795d7dNicolas Cataniabool operator!=(T* ptr, const linked_ptr<T>& x) { 2191be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania return ptr != x.get(); 2201be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania} 2211be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 2221be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// A function to convert T* into linked_ptr<T> 2231be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// Doing e.g. make_linked_ptr(new FooBarBaz<type>(arg)) is a shorter notation 2241be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania// for linked_ptr<FooBarBaz<type> >(new FooBarBaz<type>(arg)) 2251be2c9def7187e4e643c00a31dd9986395795d7dNicolas Cataniatemplate <typename T> 2261be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catanialinked_ptr<T> make_linked_ptr(T* ptr) { 2271be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania return linked_ptr<T>(ptr); 2281be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania} 2291be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 2301be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania} // namespace internal 2311be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania} // namespace testing 2321be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania 2331be2c9def7187e4e643c00a31dd9986395795d7dNicolas Catania#endif // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 234