1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
// Copyright (c) 2012 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/template_util.h"
#include <string>
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
enum SimpleEnum { SIMPLE_ENUM };
enum EnumWithExplicitType : uint64_t { ENUM_WITH_EXPLICIT_TYPE };
enum class ScopedEnum { SCOPED_ENUM };
enum class ScopedEnumWithOperator { SCOPED_ENUM_WITH_OPERATOR };
std::ostream& operator<<(std::ostream& os, ScopedEnumWithOperator v) {
return os;
}
struct SimpleStruct {};
struct StructWithOperator {};
std::ostream& operator<<(std::ostream& os, const StructWithOperator& v) {
return os;
}
// is_non_const_reference<Type>
static_assert(!is_non_const_reference<int>::value, "IsNonConstReference");
static_assert(!is_non_const_reference<const int&>::value,
"IsNonConstReference");
static_assert(is_non_const_reference<int&>::value, "IsNonConstReference");
class AssignParent {};
class AssignChild : AssignParent {};
// is_assignable<Type1, Type2>
static_assert(!is_assignable<int, int>::value, "IsAssignable"); // 1 = 1;
static_assert(!is_assignable<int, double>::value, "IsAssignable");
static_assert(is_assignable<int&, int>::value, "IsAssignable");
static_assert(is_assignable<int&, double>::value, "IsAssignable");
static_assert(is_assignable<int&, int&>::value, "IsAssignable");
static_assert(is_assignable<int&, int const&>::value, "IsAssignable");
static_assert(!is_assignable<int const&, int>::value, "IsAssignable");
static_assert(!is_assignable<AssignParent&, AssignChild>::value,
"IsAssignable");
static_assert(!is_assignable<AssignChild&, AssignParent>::value,
"IsAssignable");
struct AssignCopy {};
struct AssignNoCopy {
AssignNoCopy& operator=(AssignNoCopy&&) { return *this; }
AssignNoCopy& operator=(const AssignNoCopy&) = delete;
};
struct AssignNoMove {
AssignNoMove& operator=(AssignNoMove&&) = delete;
AssignNoMove& operator=(const AssignNoMove&) = delete;
};
static_assert(is_copy_assignable<AssignCopy>::value, "IsCopyAssignable");
static_assert(!is_copy_assignable<AssignNoCopy>::value, "IsCopyAssignable");
static_assert(is_move_assignable<AssignCopy>::value, "IsMoveAssignable");
static_assert(is_move_assignable<AssignNoCopy>::value, "IsMoveAssignable");
static_assert(!is_move_assignable<AssignNoMove>::value, "IsMoveAssignable");
// A few standard types that definitely support printing.
static_assert(internal::SupportsOstreamOperator<int>::value,
"ints should be printable");
static_assert(internal::SupportsOstreamOperator<const char*>::value,
"C strings should be printable");
static_assert(internal::SupportsOstreamOperator<std::string>::value,
"std::string should be printable");
// Various kinds of enums operator<< support.
static_assert(internal::SupportsOstreamOperator<SimpleEnum>::value,
"simple enum should be printable by value");
static_assert(internal::SupportsOstreamOperator<const SimpleEnum&>::value,
"simple enum should be printable by const ref");
static_assert(internal::SupportsOstreamOperator<EnumWithExplicitType>::value,
"enum with explicit type should be printable by value");
static_assert(
internal::SupportsOstreamOperator<const EnumWithExplicitType&>::value,
"enum with explicit type should be printable by const ref");
static_assert(!internal::SupportsOstreamOperator<ScopedEnum>::value,
"scoped enum should not be printable by value");
static_assert(!internal::SupportsOstreamOperator<const ScopedEnum&>::value,
"simple enum should not be printable by const ref");
static_assert(internal::SupportsOstreamOperator<ScopedEnumWithOperator>::value,
"scoped enum with operator<< should be printable by value");
static_assert(
internal::SupportsOstreamOperator<const ScopedEnumWithOperator&>::value,
"scoped enum with operator<< should be printable by const ref");
// operator<< support on structs.
static_assert(!internal::SupportsOstreamOperator<SimpleStruct>::value,
"simple struct should not be printable by value");
static_assert(!internal::SupportsOstreamOperator<const SimpleStruct&>::value,
"simple struct should not be printable by const ref");
static_assert(internal::SupportsOstreamOperator<StructWithOperator>::value,
"struct with operator<< should be printable by value");
static_assert(
internal::SupportsOstreamOperator<const StructWithOperator&>::value,
"struct with operator<< should be printable by const ref");
// underlying type of enums
static_assert(std::is_integral<underlying_type<SimpleEnum>::type>::value,
"simple enum must have some integral type");
static_assert(
std::is_same<underlying_type<EnumWithExplicitType>::type, uint64_t>::value,
"explicit type must be detected");
static_assert(std::is_same<underlying_type<ScopedEnum>::type, int>::value,
"scoped enum defaults to int");
struct TriviallyDestructible {
int field;
};
class NonTriviallyDestructible {
~NonTriviallyDestructible() {}
};
static_assert(is_trivially_destructible<int>::value, "IsTriviallyDestructible");
static_assert(is_trivially_destructible<TriviallyDestructible>::value,
"IsTriviallyDestructible");
static_assert(!is_trivially_destructible<NonTriviallyDestructible>::value,
"IsTriviallyDestructible");
} // namespace
} // namespace base
|
