1 // Copyright 2015 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 struct A { 6 A&& Pass(); 7 }; 8 9 struct B { 10 B& Pass(); 11 }; 12 13 struct C { 14 A a; 15 }; 16 17 struct D { 18 D&& NotPass(); 19 }; 20 21 struct E { 22 E() : a(new A) {} 23 ~E() { delete a; } 24 A* a; 25 }; 26 27 struct F { 28 explicit F(A&&); 29 F&& Pass(); 30 }; 31 32 void Test() { 33 // Pass that returns rvalue reference should use std::move. 34 A a1; 35 A a2 = a1.Pass(); 36 37 // Pass that doesn't return a rvalue reference should not be rewritten. 38 B b1; 39 B b2 = b1.Pass(); 40 41 // std::move() needs to wrap the entire expression when passing a member. 42 C c; 43 A a3 = c.a.Pass(); 44 45 // Don't rewrite things that return rvalue references that aren't named Pass. 46 D d1; 47 D d2 = d1.NotPass(); 48 49 // Pass via a pointer type should dereference the pointer first. 50 E e; 51 A a4 = e.a->Pass(); 52 53 // Nested Pass() is handled correctly. 54 A a5; 55 F f = F(a5.Pass()).Pass(); 56 57 // Chained Pass is handled correctly. 58 A a6; 59 A a7 = a6.Pass().Pass(); 60 } 61
