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Issue 1774443002: Replace template_util.h stuff with C++11 <type_traits> (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 4 years, 9 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include "base/template_util.h" 5 #include "base/template_util.h"
6 6
7 #include "testing/gtest/include/gtest/gtest.h" 7 #include "testing/gtest/include/gtest/gtest.h"
8 8
9 namespace base { 9 namespace base {
10 namespace { 10 namespace {
11 11
12 struct AStruct {};
13 class AClass {};
14 enum AnEnum {};
15
16 class Parent {};
17 class Child : public Parent {};
18
19 // is_pointer<Type>
20 static_assert(!is_pointer<int>::value, "IsPointer");
21 static_assert(!is_pointer<int&>::value, "IsPointer");
22 static_assert(is_pointer<int*>::value, "IsPointer");
23 static_assert(is_pointer<const int*>::value, "IsPointer");
24
25 // is_array<Type>
26 static_assert(!is_array<int>::value, "IsArray");
27 static_assert(!is_array<int*>::value, "IsArray");
28 static_assert(!is_array<int (*)[3]>::value, "IsArray");
29 static_assert(is_array<int[]>::value, "IsArray");
30 static_assert(is_array<const int[]>::value, "IsArray");
31 static_assert(is_array<int[3]>::value, "IsArray");
32
33 // is_non_const_reference<Type> 12 // is_non_const_reference<Type>
34 static_assert(!is_non_const_reference<int>::value, "IsNonConstReference"); 13 static_assert(!is_non_const_reference<int>::value, "IsNonConstReference");
35 static_assert(!is_non_const_reference<const int&>::value, 14 static_assert(!is_non_const_reference<const int&>::value,
36 "IsNonConstReference"); 15 "IsNonConstReference");
37 static_assert(is_non_const_reference<int&>::value, "IsNonConstReference"); 16 static_assert(is_non_const_reference<int&>::value, "IsNonConstReference");
38 17
39 // is_convertible<From, To>
40
41 // Extra parens needed to make preprocessor macro parsing happy. Otherwise,
42 // it sees the equivalent of:
43 //
44 // (is_convertible < Child), (Parent > ::value)
45 //
46 // Silly C++.
47 static_assert((is_convertible<Child, Parent>::value), "IsConvertible");
48 static_assert(!(is_convertible<Parent, Child>::value), "IsConvertible");
49 static_assert(!(is_convertible<Parent, AStruct>::value), "IsConvertible");
50 static_assert((is_convertible<int, double>::value), "IsConvertible");
51 static_assert((is_convertible<int*, void*>::value), "IsConvertible");
52 static_assert(!(is_convertible<void*, int*>::value), "IsConvertible");
53
54 // Array types are an easy corner case. Make sure to test that
55 // it does indeed compile.
56 static_assert(!(is_convertible<int[10], double>::value), "IsConvertible");
57 static_assert(!(is_convertible<double, int[10]>::value), "IsConvertible");
58 static_assert((is_convertible<int[10], int*>::value), "IsConvertible");
59
60 // is_same<Type1, Type2>
61 static_assert(!(is_same<Child, Parent>::value), "IsSame");
62 static_assert(!(is_same<Parent, Child>::value), "IsSame");
63 static_assert((is_same<Parent, Parent>::value), "IsSame");
64 static_assert((is_same<int*, int*>::value), "IsSame");
65 static_assert((is_same<int, int>::value), "IsSame");
66 static_assert((is_same<void, void>::value), "IsSame");
67 static_assert(!(is_same<int, double>::value), "IsSame");
68
69 // is_class<Type>
70 static_assert(is_class<AStruct>::value, "IsClass");
71 static_assert(is_class<AClass>::value, "IsClass");
72 static_assert(!is_class<AnEnum>::value, "IsClass");
73 static_assert(!is_class<int>::value, "IsClass");
74 static_assert(!is_class<char*>::value, "IsClass");
75 static_assert(!is_class<int&>::value, "IsClass");
76 static_assert(!is_class<char[3]>::value, "IsClass");
77
78 static_assert(!is_member_function_pointer<int>::value,
79 "IsMemberFunctionPointer");
80 static_assert(!is_member_function_pointer<int*>::value,
81 "IsMemberFunctionPointer");
82 static_assert(!is_member_function_pointer<void*>::value,
83 "IsMemberFunctionPointer");
84 static_assert(!is_member_function_pointer<AStruct>::value,
85 "IsMemberFunctionPointer");
86 static_assert(!is_member_function_pointer<AStruct*>::value,
87 "IsMemberFunctionPointer");
88 static_assert(!is_member_function_pointer<void (*)()>::value,
89 "IsMemberFunctionPointer");
90 static_assert(!is_member_function_pointer<int (*)(int)>::value,
91 "IsMemberFunctionPointer");
92 static_assert(!is_member_function_pointer<int (*)(int, int)>::value,
93 "IsMemberFunctionPointer");
94
95 static_assert(is_member_function_pointer<void (AStruct::*)()>::value,
96 "IsMemberFunctionPointer");
97 static_assert(is_member_function_pointer<void (AStruct::*)(int)>::value,
98 "IsMemberFunctionPointer");
99 static_assert(is_member_function_pointer<int (AStruct::*)(int)>::value,
100 "IsMemberFunctionPointer");
101 static_assert(is_member_function_pointer<int (AStruct::*)(int) const>::value,
102 "IsMemberFunctionPointer");
103 static_assert(is_member_function_pointer<int (AStruct::*)(int, int)>::value,
104 "IsMemberFunctionPointer");
105
106 } // namespace 18 } // namespace
107 } // namespace base 19 } // namespace base
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