17ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Copyright 2003 Google Inc. 27ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// All rights reserved. 37ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 47ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Redistribution and use in source and binary forms, with or without 57ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// modification, are permitted provided that the following conditions are 67ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// met: 77ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 87ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// * Redistributions of source code must retain the above copyright 97ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// notice, this list of conditions and the following disclaimer. 107ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// * Redistributions in binary form must reproduce the above 117ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// copyright notice, this list of conditions and the following disclaimer 127ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// in the documentation and/or other materials provided with the 137ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// distribution. 147ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// * Neither the name of Google Inc. nor the names of its 157ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// contributors may be used to endorse or promote products derived from 167ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// this software without specific prior written permission. 177ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 187ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 197ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 207ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 217ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 227ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 237ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 247ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 257ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 267ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 277ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 287ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 297ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 307ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Authors: Dan Egnor (egnor@google.com) 317ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 327ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// A "smart" pointer type with reference tracking. Every pointer to a 337ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// particular object is kept on a circular linked list. When the last pointer 347ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// to an object is destroyed or reassigned, the object is deleted. 357ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 367ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Used properly, this deletes the object when the last reference goes away. 377ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// There are several caveats: 387ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// - Like all reference counting schemes, cycles lead to leaks. 397ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// - Each smart pointer is actually two pointers (8 bytes instead of 4). 407ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// - Every time a pointer is assigned, the entire list of pointers to that 417ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// object is traversed. This class is therefore NOT SUITABLE when there 427ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// will often be more than two or three pointers to a particular object. 437ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// - References are only tracked as long as linked_ptr<> objects are copied. 447ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// If a linked_ptr<> is converted to a raw pointer and back, BAD THINGS 457ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// will happen (double deletion). 467ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 477ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// A good use of this class is storing object references in STL containers. 487ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// You can safely put linked_ptr<> in a vector<>. 497ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Other uses may not be as good. 507ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 517ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Note: If you use an incomplete type with linked_ptr<>, the class 527ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// *containing* linked_ptr<> must have a constructor and destructor (even 537ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// if they do nothing!). 547ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 557ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Bill Gibbons suggested we use something like this. 567ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 577ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Thread Safety: 587ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Unlike other linked_ptr implementations, in this implementation 597ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// a linked_ptr object is thread-safe in the sense that: 607ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// - it's safe to copy linked_ptr objects concurrently, 617ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// - it's safe to copy *from* a linked_ptr and read its underlying 627ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// raw pointer (e.g. via get()) concurrently, and 637ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// - it's safe to write to two linked_ptrs that point to the same 647ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// shared object concurrently. 657ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// TODO(wan@google.com): rename this to safe_linked_ptr to avoid 667ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// confusion with normal linked_ptr. 677ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 687ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman#ifndef GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 697ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman#define GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 707ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 717ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman#include <stdlib.h> 727ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman#include <assert.h> 737ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 74b33f8e3e55932d0e15a686ef0c598da8dbc37acdJay Foad#include "gtest/internal/gtest-port.h" 757ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 767ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmannamespace testing { 777ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmannamespace internal { 787ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 797ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Protects copying of all linked_ptr objects. 8057240ff6e2252f8986f6e47e4010bc52fbae25d1Benjamin KramerGTEST_API_ GTEST_DECLARE_STATIC_MUTEX_(g_linked_ptr_mutex); 817ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 827ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// This is used internally by all instances of linked_ptr<>. It needs to be 837ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// a non-template class because different types of linked_ptr<> can refer to 847ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// the same object (linked_ptr<Superclass>(obj) vs linked_ptr<Subclass>(obj)). 857ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// So, it needs to be possible for different types of linked_ptr to participate 867ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// in the same circular linked list, so we need a single class type here. 877ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// 887ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// DO NOT USE THIS CLASS DIRECTLY YOURSELF. Use linked_ptr<T>. 897ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmanclass linked_ptr_internal { 907ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman public: 917ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Create a new circle that includes only this instance. 927ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman void join_new() { 937ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman next_ = this; 947ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 957ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 967ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Many linked_ptr operations may change p.link_ for some linked_ptr 977ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // variable p in the same circle as this object. Therefore we need 987ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // to prevent two such operations from occurring concurrently. 997ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // 1007ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Note that different types of linked_ptr objects can coexist in a 1017ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // circle (e.g. linked_ptr<Base>, linked_ptr<Derived1>, and 1027ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // linked_ptr<Derived2>). Therefore we must use a single mutex to 1037ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // protect all linked_ptr objects. This can create serious 1047ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // contention in production code, but is acceptable in a testing 1057ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // framework. 1067ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1077ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Join an existing circle. 1087ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // L < g_linked_ptr_mutex 1097ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman void join(linked_ptr_internal const* ptr) { 1107ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman MutexLock lock(&g_linked_ptr_mutex); 1117ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1127ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman linked_ptr_internal const* p = ptr; 1137ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman while (p->next_ != ptr) p = p->next_; 1147ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman p->next_ = this; 1157ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman next_ = ptr; 1167ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1177ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1187ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Leave whatever circle we're part of. Returns true if we were the 1197ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // last member of the circle. Once this is done, you can join() another. 1207ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // L < g_linked_ptr_mutex 1217ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman bool depart() { 1227ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman MutexLock lock(&g_linked_ptr_mutex); 1237ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1247ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman if (next_ == this) return true; 1257ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman linked_ptr_internal const* p = next_; 1267ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman while (p->next_ != this) p = p->next_; 1277ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman p->next_ = next_; 1287ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman return false; 1297ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1307ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1317ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman private: 1327ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman mutable linked_ptr_internal const* next_; 1337ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman}; 1347ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1357ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmantemplate <typename T> 1367ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmanclass linked_ptr { 1377ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman public: 1387ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman typedef T element_type; 1397ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1407ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Take over ownership of a raw pointer. This should happen as soon as 1417ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // possible after the object is created. 1427ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman explicit linked_ptr(T* ptr = NULL) { capture(ptr); } 1437ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman ~linked_ptr() { depart(); } 1447ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1457ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Copy an existing linked_ptr<>, adding ourselves to the list of references. 1467ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman template <typename U> linked_ptr(linked_ptr<U> const& ptr) { copy(&ptr); } 1477ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman linked_ptr(linked_ptr const& ptr) { // NOLINT 1487ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman assert(&ptr != this); 1497ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman copy(&ptr); 1507ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1517ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1527ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Assignment releases the old value and acquires the new. 1537ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman template <typename U> linked_ptr& operator=(linked_ptr<U> const& ptr) { 1547ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman depart(); 1557ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman copy(&ptr); 1567ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman return *this; 1577ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1587ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1597ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman linked_ptr& operator=(linked_ptr const& ptr) { 1607ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman if (&ptr != this) { 1617ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman depart(); 1627ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman copy(&ptr); 1637ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1647ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman return *this; 1657ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1667ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1677ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman // Smart pointer members. 1687ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman void reset(T* ptr = NULL) { 1697ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman depart(); 1707ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman capture(ptr); 1717ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1727ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman T* get() const { return value_; } 1737ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman T* operator->() const { return value_; } 1747ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman T& operator*() const { return *value_; } 1757ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1767ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman bool operator==(T* p) const { return value_ == p; } 1777ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman bool operator!=(T* p) const { return value_ != p; } 1787ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman template <typename U> 1797ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman bool operator==(linked_ptr<U> const& ptr) const { 1807ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman return value_ == ptr.get(); 1817ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1827ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman template <typename U> 1837ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman bool operator!=(linked_ptr<U> const& ptr) const { 1847ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman return value_ != ptr.get(); 1857ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1867ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1877ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman private: 1887ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman template <typename U> 1897ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman friend class linked_ptr; 1907ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1917ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman T* value_; 1927ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman linked_ptr_internal link_; 1937ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1947ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman void depart() { 1957ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman if (link_.depart()) delete value_; 1967ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 1977ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 1987ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman void capture(T* ptr) { 1997ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman value_ = ptr; 2007ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman link_.join_new(); 2017ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 2027ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 2037ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman template <typename U> void copy(linked_ptr<U> const* ptr) { 2047ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman value_ = ptr->get(); 2057ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman if (value_) 2067ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman link_.join(&ptr->link_); 2077ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman else 2087ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman link_.join_new(); 2097ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman } 2107ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman}; 2117ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 2127ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmantemplate<typename T> inline 2137ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmanbool operator==(T* ptr, const linked_ptr<T>& x) { 2147ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman return ptr == x.get(); 2157ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman} 2167ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 2177ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmantemplate<typename T> inline 2187ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmanbool operator!=(T* ptr, const linked_ptr<T>& x) { 2197ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman return ptr != x.get(); 2207ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman} 2217ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 2227ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// A function to convert T* into linked_ptr<T> 2237ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// Doing e.g. make_linked_ptr(new FooBarBaz<type>(arg)) is a shorter notation 2247ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman// for linked_ptr<FooBarBaz<type> >(new FooBarBaz<type>(arg)) 2257ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmantemplate <typename T> 2267ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukmanlinked_ptr<T> make_linked_ptr(T* ptr) { 2277ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman return linked_ptr<T>(ptr); 2287ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman} 2297ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 2307ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman} // namespace internal 2317ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman} // namespace testing 2327ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman 2337ae6ff442a26212a0cc4c1929b8b0a105dc988e4Misha Brukman#endif // GTEST_INCLUDE_GTEST_INTERNAL_GTEST_LINKED_PTR_H_ 234