| // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/callback.h" |
| |
| namespace base { |
| |
| class Parent { |
| }; |
| |
| class Child : Parent { |
| }; |
| |
| #if defined(NCTEST_EQUALS_REQUIRES_SAMETYPE) // [r"fatal error: no viable conversion from 'Callback<int \(\)>' to 'const Callback<void \(\)>'"] |
| |
| // Attempting to call comparison function on two callbacks of different type. |
| // |
| // This should be a compile time failure because each callback type should be |
| // considered distinct. |
| void WontCompile() { |
| Closure c1; |
| Callback<int(void)> c2; |
| c1.Equals(c2); |
| } |
| |
| #elif defined(NCTEST_CONSTRUCTION_FROM_SUBTYPE) // [r"fatal error: no viable conversion from 'Callback<base::Parent \(\)>' to 'Callback<base::Child \(\)>'"] |
| |
| // Construction of Callback<A> from Callback<B> if A is supertype of B. |
| // |
| // While this is technically safe, most people aren't used to it when coding |
| // C++ so if this is happening, it is almost certainly an error. |
| void WontCompile() { |
| Callback<Parent(void)> cb_a; |
| Callback<Child(void)> cb_b = cb_a; |
| } |
| |
| #elif defined(NCTEST_ASSIGNMENT_FROM_SUBTYPE) // [r"fatal error: no viable overloaded '='"] |
| |
| // Assignment of Callback<A> from Callback<B> if A is supertype of B. |
| // See explanation for NCTEST_CONSTRUCTION_FROM_SUBTYPE |
| void WontCompile() { |
| Callback<Parent(void)> cb_a; |
| Callback<Child(void)> cb_b; |
| cb_a = cb_b; |
| } |
| |
| #endif |
| |
| } // namespace base |