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Side by Side Diff: base/callback_unittest.nc

Issue 1647803004: Move base to DEPS (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 4 years, 10 months ago
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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
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