1fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Copyright 2003 Google Inc. 2fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// All rights reserved. 3fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 4fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Redistribution and use in source and binary forms, with or without 5fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// modification, are permitted provided that the following conditions are 6fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// met: 7fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 8fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// * Redistributions of source code must retain the above copyright 9fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// notice, this list of conditions and the following disclaimer. 10fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// * Redistributions in binary form must reproduce the above 11fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// copyright notice, this list of conditions and the following disclaimer 12fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// in the documentation and/or other materials provided with the 13fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// distribution. 14fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// * Neither the name of Google Inc. nor the names of its 15fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// contributors may be used to endorse or promote products derived from 16fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// this software without specific prior written permission. 17fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 18fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 30fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Authors: Dan Egnor (egnor@google.com) 31fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 32fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// A "smart" pointer type with reference tracking. Every pointer to a 33fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// particular object is kept on a circular linked list. When the last pointer 34fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// to an object is destroyed or reassigned, the object is deleted. 35fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 36fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Used properly, this deletes the object when the last reference goes away. 37fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// There are several caveats: 38fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// - Like all reference counting schemes, cycles lead to leaks. 39fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// - Each smart pointer is actually two pointers (8 bytes instead of 4). 40fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// - Every time a pointer is assigned, the entire list of pointers to that 41fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// object is traversed. This class is therefore NOT SUITABLE when there 42fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// will often be more than two or three pointers to a particular object. 43fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// - References are only tracked as long as linked_ptr<> objects are copied. 44fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// If a linked_ptr<> is converted to a raw pointer and back, BAD THINGS 45fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// will happen (double deletion). 46fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 47fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// A good use of this class is storing object references in STL containers. 48fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// You can safely put linked_ptr<> in a vector<>. 49fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Other uses may not be as good. 50fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 51fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Note: If you use an incomplete type with linked_ptr<>, the class 52fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// *containing* linked_ptr<> must have a constructor and destructor (even 53fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// if they do nothing!). 54fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 55fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Bill Gibbons suggested we use something like this. 56fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 57fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Thread Safety: 58fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Unlike other linked_ptr implementations, in this implementation 59fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// a linked_ptr object is thread-safe in the sense that: 60fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// - it's safe to copy linked_ptr objects concurrently, 61fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// - it's safe to copy *from* a linked_ptr and read its underlying 62fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// raw pointer (e.g. via get()) concurrently, and 63fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// - it's safe to write to two linked_ptrs that point to the same 64fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// shared object concurrently. 65fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// TODO(wan@google.com): rename this to safe_linked_ptr to avoid 66fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// confusion with normal linked_ptr. 67fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 68fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 69fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 70fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 71fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville#include <stdlib.h> 72fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville#include <assert.h> 73fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 74fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville#include <gtest/internal/gtest-port.h> 75fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 76fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savillenamespace testing { 77fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savillenamespace internal { 78fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 79fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Protects copying of all linked_ptr objects. 80fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savilleextern Mutex g_linked_ptr_mutex; 81fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 82fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// This is used internally by all instances of linked_ptr<>. It needs to be 83fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// a non-template class because different types of linked_ptr<> can refer to 84fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// the same object (linked_ptr<Superclass>(obj) vs linked_ptr<Subclass>(obj)). 85fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// So, it needs to be possible for different types of linked_ptr to participate 86fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// in the same circular linked list, so we need a single class type here. 87fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// 88fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// DO NOT USE THIS CLASS DIRECTLY YOURSELF. Use linked_ptr<T>. 89fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savilleclass linked_ptr_internal { 90fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville public: 91fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Create a new circle that includes only this instance. 92fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville void join_new() { 93fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville next_ = this; 94fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 95fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 96fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Many linked_ptr operations may change p.link_ for some linked_ptr 97fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // variable p in the same circle as this object. Therefore we need 98fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // to prevent two such operations from occurring concurrently. 99fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // 100fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Note that different types of linked_ptr objects can coexist in a 101fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // circle (e.g. linked_ptr<Base>, linked_ptr<Derived1>, and 102fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // linked_ptr<Derived2>). Therefore we must use a single mutex to 103fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // protect all linked_ptr objects. This can create serious 104fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // contention in production code, but is acceptable in a testing 105fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // framework. 106fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 107fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Join an existing circle. 108fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // L < g_linked_ptr_mutex 109fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville void join(linked_ptr_internal const* ptr) { 110fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville MutexLock lock(&g_linked_ptr_mutex); 111fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 112fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville linked_ptr_internal const* p = ptr; 113fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville while (p->next_ != ptr) p = p->next_; 114fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville p->next_ = this; 115fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville next_ = ptr; 116fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 117fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 118fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Leave whatever circle we're part of. Returns true if we were the 119fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // last member of the circle. Once this is done, you can join() another. 120fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // L < g_linked_ptr_mutex 121fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville bool depart() { 122fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville MutexLock lock(&g_linked_ptr_mutex); 123fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 124fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville if (next_ == this) return true; 125fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville linked_ptr_internal const* p = next_; 126fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville while (p->next_ != this) p = p->next_; 127fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville p->next_ = next_; 128fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return false; 129fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 130fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 131fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville private: 132fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville mutable linked_ptr_internal const* next_; 133fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville}; 134fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 135fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savilletemplate <typename T> 136fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savilleclass linked_ptr { 137fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville public: 138fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville typedef T element_type; 139fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 140fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Take over ownership of a raw pointer. This should happen as soon as 141fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // possible after the object is created. 142fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville explicit linked_ptr(T* ptr = NULL) { capture(ptr); } 143fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville ~linked_ptr() { depart(); } 144fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 145fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Copy an existing linked_ptr<>, adding ourselves to the list of references. 146fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville template <typename U> linked_ptr(linked_ptr<U> const& ptr) { copy(&ptr); } 147fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville linked_ptr(linked_ptr const& ptr) { // NOLINT 148fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville assert(&ptr != this); 149fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville copy(&ptr); 150fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 151fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 152fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Assignment releases the old value and acquires the new. 153fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville template <typename U> linked_ptr& operator=(linked_ptr<U> const& ptr) { 154fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville depart(); 155fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville copy(&ptr); 156fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return *this; 157fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 158fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 159fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville linked_ptr& operator=(linked_ptr const& ptr) { 160fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville if (&ptr != this) { 161fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville depart(); 162fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville copy(&ptr); 163fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 164fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return *this; 165fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 166fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 167fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Smart pointer members. 168fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville void reset(T* ptr = NULL) { 169fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville depart(); 170fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville capture(ptr); 171fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 172fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville T* get() const { return value_; } 173fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville T* operator->() const { return value_; } 174fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville T& operator*() const { return *value_; } 175fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Release ownership of the pointed object and returns it. 176fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville // Sole ownership by this linked_ptr object is required. 177fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville T* release() { 178fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville bool last = link_.depart(); 179fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville assert(last); 180fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville T* v = value_; 181fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville value_ = NULL; 182fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return v; 183fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 184fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 185fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville bool operator==(T* p) const { return value_ == p; } 186fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville bool operator!=(T* p) const { return value_ != p; } 187fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville template <typename U> 188fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville bool operator==(linked_ptr<U> const& ptr) const { 189fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return value_ == ptr.get(); 190fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 191fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville template <typename U> 192fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville bool operator!=(linked_ptr<U> const& ptr) const { 193fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return value_ != ptr.get(); 194fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 195fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 196fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville private: 197fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville template <typename U> 198fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville friend class linked_ptr; 199fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 200fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville T* value_; 201fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville linked_ptr_internal link_; 202fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 203fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville void depart() { 204fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville if (link_.depart()) delete value_; 205fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 206fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 207fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville void capture(T* ptr) { 208fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville value_ = ptr; 209fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville link_.join_new(); 210fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 211fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 212fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville template <typename U> void copy(linked_ptr<U> const* ptr) { 213fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville value_ = ptr->get(); 214fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville if (value_) 215fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville link_.join(&ptr->link_); 216fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville else 217fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville link_.join_new(); 218fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville } 219fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville}; 220fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 221fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savilletemplate<typename T> inline 222fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savillebool operator==(T* ptr, const linked_ptr<T>& x) { 223fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return ptr == x.get(); 224fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville} 225fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 226fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savilletemplate<typename T> inline 227fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savillebool operator!=(T* ptr, const linked_ptr<T>& x) { 228fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return ptr != x.get(); 229fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville} 230fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 231fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// A function to convert T* into linked_ptr<T> 232fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// Doing e.g. make_linked_ptr(new FooBarBaz<type>(arg)) is a shorter notation 233fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville// for linked_ptr<FooBarBaz<type> >(new FooBarBaz<type>(arg)) 234fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savilletemplate <typename T> 235fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Savillelinked_ptr<T> make_linked_ptr(T* ptr) { 236fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville return linked_ptr<T>(ptr); 237fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville} 238fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 239fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville} // namespace internal 240fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville} // namespace testing 241fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville 242fbaaef999ba563838ebd00874ed8a1c01fbf286dWink Saville#endif // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 243