| OLD | NEW |
| (Empty) |
| 1 // Copyright (c) 2011 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 #include "base/callback.h" | |
| 6 | |
| 7 namespace base { | |
| 8 | |
| 9 class Parent { | |
| 10 }; | |
| 11 | |
| 12 class Child : Parent { | |
| 13 }; | |
| 14 | |
| 15 #if defined(NCTEST_EQUALS_REQUIRES_SAMETYPE) // [r"fatal error: no viable conve
rsion from 'Callback<int \(\)>' to 'const Callback<void \(\)>'"] | |
| 16 | |
| 17 // Attempting to call comparison function on two callbacks of different type. | |
| 18 // | |
| 19 // This should be a compile time failure because each callback type should be | |
| 20 // considered distinct. | |
| 21 void WontCompile() { | |
| 22 Closure c1; | |
| 23 Callback<int(void)> c2; | |
| 24 c1.Equals(c2); | |
| 25 } | |
| 26 | |
| 27 #elif defined(NCTEST_CONSTRUCTION_FROM_SUBTYPE) // [r"fatal error: no viable co
nversion from 'Callback<base::Parent \(\)>' to 'Callback<base::Child \(\)>'"] | |
| 28 | |
| 29 // Construction of Callback<A> from Callback<B> if A is supertype of B. | |
| 30 // | |
| 31 // While this is technically safe, most people aren't used to it when coding | |
| 32 // C++ so if this is happening, it is almost certainly an error. | |
| 33 void WontCompile() { | |
| 34 Callback<Parent(void)> cb_a; | |
| 35 Callback<Child(void)> cb_b = cb_a; | |
| 36 } | |
| 37 | |
| 38 #elif defined(NCTEST_ASSIGNMENT_FROM_SUBTYPE) // [r"fatal error: no viable over
loaded '='"] | |
| 39 | |
| 40 // Assignment of Callback<A> from Callback<B> if A is supertype of B. | |
| 41 // See explanation for NCTEST_CONSTRUCTION_FROM_SUBTYPE | |
| 42 void WontCompile() { | |
| 43 Callback<Parent(void)> cb_a; | |
| 44 Callback<Child(void)> cb_b; | |
| 45 cb_a = cb_b; | |
| 46 } | |
| 47 | |
| 48 #endif | |
| 49 | |
| 50 } // namespace base | |
| OLD | NEW |