147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org/* 247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * Copyright 2012 The WebRTC Project Authors. All rights reserved. 347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * 447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * Use of this source code is governed by a BSD-style license 547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * that can be found in the LICENSE file in the root of the source 647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * tree. An additional intellectual property rights grant can be found 747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * in the file PATENTS. All contributing project authors may 847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org * be found in the AUTHORS file in the root of the source tree. 947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org */ 1047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#ifndef THIRD_PARTY_WEBRTC_FILES_WEBRTC_BASE_MOVE_H_ 1247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#define THIRD_PARTY_WEBRTC_FILES_WEBRTC_BASE_MOVE_H_ 1347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 1447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Macro with the boilerplate that makes a type move-only in C++03. 1547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 1647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// USAGE 1747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 1847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// This macro should be used instead of DISALLOW_COPY_AND_ASSIGN to create 1947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// a "move-only" type. Unlike DISALLOW_COPY_AND_ASSIGN, this macro should be 2047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// the first line in a class declaration. 2147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 2247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// A class using this macro must call .Pass() (or somehow be an r-value already) 2347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// before it can be: 2447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 2547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// * Passed as a function argument 2647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// * Used as the right-hand side of an assignment 2747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// * Returned from a function 2847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 2947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Each class will still need to define their own "move constructor" and "move 3047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// operator=" to make this useful. Here's an example of the macro, the move 3147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// constructor, and the move operator= from the scoped_ptr class: 3247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 3347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// template <typename T> 3447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// class scoped_ptr { 3547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// TALK_MOVE_ONLY_TYPE_FOR_CPP_03(scoped_ptr, RValue) 3647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// public: 3747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// scoped_ptr(RValue& other) : ptr_(other.release()) { } 3847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// scoped_ptr& operator=(RValue& other) { 3947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// swap(other); 4047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// return *this; 4147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// } 4247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// }; 4347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 4447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Note that the constructor must NOT be marked explicit. 4547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 4647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// For consistency, the second parameter to the macro should always be RValue 4747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// unless you have a strong reason to do otherwise. It is only exposed as a 4847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// macro parameter so that the move constructor and move operator= don't look 4947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// like they're using a phantom type. 5047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 5147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 5247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// HOW THIS WORKS 5347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 5447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// For a thorough explanation of this technique, see: 5547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 5647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// http://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Move_Constructor 5747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 5847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// The summary is that we take advantage of 2 properties: 5947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 6047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 1) non-const references will not bind to r-values. 6147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 2) C++ can apply one user-defined conversion when initializing a 6247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// variable. 6347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 6447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// The first lets us disable the copy constructor and assignment operator 6547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// by declaring private version of them with a non-const reference parameter. 6647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 6747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// For l-values, direct initialization still fails like in 6847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// DISALLOW_COPY_AND_ASSIGN because the copy constructor and assignment 6947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// operators are private. 7047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 7147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// For r-values, the situation is different. The copy constructor and 7247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// assignment operator are not viable due to (1), so we are trying to call 7347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// a non-existent constructor and non-existing operator= rather than a private 7447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// one. Since we have not committed an error quite yet, we can provide an 7547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// alternate conversion sequence and a constructor. We add 7647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 7747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// * a private struct named "RValue" 7847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// * a user-defined conversion "operator RValue()" 7947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// * a "move constructor" and "move operator=" that take the RValue& as 8047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// their sole parameter. 8147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 8247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Only r-values will trigger this sequence and execute our "move constructor" 8347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// or "move operator=." L-values will match the private copy constructor and 8447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// operator= first giving a "private in this context" error. This combination 8547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// gives us a move-only type. 8647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 8747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// For signaling a destructive transfer of data from an l-value, we provide a 8847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// method named Pass() which creates an r-value for the current instance 8947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// triggering the move constructor or move operator=. 9047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 9147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Other ways to get r-values is to use the result of an expression like a 9247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// function call. 9347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 9447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Here's an example with comments explaining what gets triggered where: 9547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 9647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// class Foo { 9747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// TALK_MOVE_ONLY_TYPE_FOR_CPP_03(Foo, RValue); 9847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 9947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// public: 10047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// ... API ... 10147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo(RValue other); // Move constructor. 10247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo& operator=(RValue rhs); // Move operator= 10347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// }; 10447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 10547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo MakeFoo(); // Function that returns a Foo. 10647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 10747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo f; 10847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo f_copy(f); // ERROR: Foo(Foo&) is private in this context. 10947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo f_assign; 11047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// f_assign = f; // ERROR: operator=(Foo&) is private in this context. 11147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 11247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 11347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo f(MakeFoo()); // R-value so alternate conversion executed. 11447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo f_copy(f.Pass()); // R-value so alternate conversion executed. 11547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// f = f_copy.Pass(); // R-value so alternate conversion executed. 11647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 11747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 11847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// IMPLEMENTATION SUBTLETIES WITH RValue 11947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 12047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// The RValue struct is just a container for a pointer back to the original 12147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// object. It should only ever be created as a temporary, and no external 12247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// class should ever declare it or use it in a parameter. 12347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 12447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// It is tempting to want to use the RValue type in function parameters, but 12547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// excluding the limited usage here for the move constructor and move 12647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// operator=, doing so would mean that the function could take both r-values 12747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// and l-values equially which is unexpected. See COMPARED To Boost.Move for 12847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// more details. 12947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 13047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// An alternate, and incorrect, implementation of the RValue class used by 13147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Boost.Move makes RValue a fieldless child of the move-only type. RValue& 13247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// is then used in place of RValue in the various operators. The RValue& is 13347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// "created" by doing *reinterpret_cast<RValue*>(this). This has the appeal 13447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// of never creating a temporary RValue struct even with optimizations 13547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// disabled. Also, by virtue of inheritance you can treat the RValue 13647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// reference as if it were the move-only type itself. Unfortunately, 13747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// using the result of this reinterpret_cast<> is actually undefined behavior 13847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// due to C++98 5.2.10.7. In certain compilers (e.g., NaCl) the optimizer 13947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// will generate non-working code. 14047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 14147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// In optimized builds, both implementations generate the same assembly so we 14247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// choose the one that adheres to the standard. 14347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 14447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 14547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// COMPARED TO C++11 14647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 14747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// In C++11, you would implement this functionality using an r-value reference 14847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// and our .Pass() method would be replaced with a call to std::move(). 14947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 15047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// This emulation also has a deficiency where it uses up the single 15147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// user-defined conversion allowed by C++ during initialization. This can 15247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// cause problems in some API edge cases. For instance, in scoped_ptr, it is 15347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// impossible to make a function "void Foo(scoped_ptr<Parent> p)" accept a 15447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// value of type scoped_ptr<Child> even if you add a constructor to 15547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// scoped_ptr<> that would make it look like it should work. C++11 does not 15647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// have this deficiency. 15747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 15847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 15947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// COMPARED TO Boost.Move 16047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 16147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Our implementation similar to Boost.Move, but we keep the RValue struct 16247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// private to the move-only type, and we don't use the reinterpret_cast<> hack. 16347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 16447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// In Boost.Move, RValue is the boost::rv<> template. This type can be used 16547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// when writing APIs like: 16647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 16747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// void MyFunc(boost::rv<Foo>& f) 16847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 16947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// that can take advantage of rv<> to avoid extra copies of a type. However you 17047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// would still be able to call this version of MyFunc with an l-value: 17147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 17247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Foo f; 17347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// MyFunc(f); // Uh oh, we probably just destroyed |f| w/o calling Pass(). 17447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 17547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// unless someone is very careful to also declare a parallel override like: 17647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 17747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// void MyFunc(const Foo& f) 17847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 17947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// that would catch the l-values first. This was declared unsafe in C++11 and 18047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// a C++11 compiler will explicitly fail MyFunc(f). Unfortunately, we cannot 18147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// ensure this in C++03. 18247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 18347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Since we have no need for writing such APIs yet, our implementation keeps 18447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// RValue private and uses a .Pass() method to do the conversion instead of 18547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// trying to write a version of "std::move()." Writing an API like std::move() 18647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// would require the RValue struct to be public. 18747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 18847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 18947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// CAVEATS 19047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 19147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// If you include a move-only type as a field inside a class that does not 19247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// explicitly declare a copy constructor, the containing class's implicit 19347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// copy constructor will change from Containing(const Containing&) to 19447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// Containing(Containing&). This can cause some unexpected errors. 19547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 19647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// http://llvm.org/bugs/show_bug.cgi?id=11528 19747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 19847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// The workaround is to explicitly declare your copy constructor. 19947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org// 20047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#define TALK_MOVE_ONLY_TYPE_FOR_CPP_03(type, rvalue_type) \ 20147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org private: \ 20247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org struct rvalue_type { \ 20347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org explicit rvalue_type(type* object) : object(object) {} \ 20447be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org type* object; \ 20547be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org }; \ 20647be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org type(type&); \ 20747be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org void operator=(type&); \ 20847be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org public: \ 20947be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org operator rvalue_type() { return rvalue_type(this); } \ 21047be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org type Pass() { return type(rvalue_type(this)); } \ 21147be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org private: 21247be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org 21347be73b8629244d6bb63a28198f97f040ce53d21henrike@webrtc.org#endif // THIRD_PARTY_WEBRTC_FILES_WEBRTC_BASE_MOVE_H_ 214