OLD | NEW |
1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_CLONE_EQUALS_UTIL_H_ | 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_EQUALS_TRAITS_H_ |
6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_CLONE_EQUALS_UTIL_H_ | 6 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_EQUALS_TRAITS_H_ |
7 | 7 |
8 #include <type_traits> | 8 #include <type_traits> |
9 #include <unordered_map> | 9 #include <unordered_map> |
10 #include <vector> | 10 #include <vector> |
11 | 11 |
12 #include "base/optional.h" | 12 #include "base/optional.h" |
13 #include "mojo/public/cpp/bindings/lib/template_util.h" | 13 #include "mojo/public/cpp/bindings/lib/template_util.h" |
14 | 14 |
15 namespace mojo { | 15 namespace mojo { |
16 namespace internal { | 16 namespace internal { |
17 | 17 |
18 template <typename T> | 18 template <typename T> |
19 struct HasCloneMethod { | |
20 template <typename U> | |
21 static char Test(decltype(&U::Clone)); | |
22 template <typename U> | |
23 static int Test(...); | |
24 static const bool value = sizeof(Test<T>(0)) == sizeof(char); | |
25 | |
26 private: | |
27 EnsureTypeIsComplete<T> check_t_; | |
28 }; | |
29 | |
30 template <typename T, bool has_clone_method = HasCloneMethod<T>::value> | |
31 struct CloneTraits; | |
32 | |
33 template <typename T> | |
34 T Clone(const T& input); | |
35 | |
36 template <typename T> | |
37 struct CloneTraits<T, true> { | |
38 static T Clone(const T& input) { return input.Clone(); } | |
39 }; | |
40 | |
41 template <typename T> | |
42 struct CloneTraits<T, false> { | |
43 static T Clone(const T& input) { return input; } | |
44 }; | |
45 | |
46 template <typename T> | |
47 struct CloneTraits<base::Optional<T>, false> { | |
48 static base::Optional<T> Clone(const base::Optional<T>& input) { | |
49 if (!input) | |
50 return base::nullopt; | |
51 | |
52 return base::Optional<T>(internal::Clone(*input)); | |
53 } | |
54 }; | |
55 | |
56 template <typename T> | |
57 struct CloneTraits<std::vector<T>, false> { | |
58 static std::vector<T> Clone(const std::vector<T>& input) { | |
59 std::vector<T> result; | |
60 result.reserve(input.size()); | |
61 for (const auto& element : input) | |
62 result.push_back(internal::Clone(element)); | |
63 | |
64 return result; | |
65 } | |
66 }; | |
67 | |
68 template <typename K, typename V> | |
69 struct CloneTraits<std::unordered_map<K, V>, false> { | |
70 static std::unordered_map<K, V> Clone(const std::unordered_map<K, V>& input) { | |
71 std::unordered_map<K, V> result; | |
72 for (const auto& element : input) { | |
73 result.insert(std::make_pair(internal::Clone(element.first), | |
74 internal::Clone(element.second))); | |
75 } | |
76 return result; | |
77 } | |
78 }; | |
79 | |
80 template <typename T> | |
81 T Clone(const T& input) { | |
82 return CloneTraits<T>::Clone(input); | |
83 }; | |
84 | |
85 template <typename T> | |
86 struct HasEqualsMethod { | 19 struct HasEqualsMethod { |
87 template <typename U> | 20 template <typename U> |
88 static char Test(decltype(&U::Equals)); | 21 static char Test(decltype(&U::Equals)); |
89 template <typename U> | 22 template <typename U> |
90 static int Test(...); | 23 static int Test(...); |
91 static const bool value = sizeof(Test<T>(0)) == sizeof(char); | 24 static const bool value = sizeof(Test<T>(0)) == sizeof(char); |
92 | 25 |
93 private: | 26 private: |
94 EnsureTypeIsComplete<T> check_t_; | 27 EnsureTypeIsComplete<T> check_t_; |
95 }; | 28 }; |
(...skipping 55 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
151 }; | 84 }; |
152 | 85 |
153 template <typename T> | 86 template <typename T> |
154 bool Equals(const T& a, const T& b) { | 87 bool Equals(const T& a, const T& b) { |
155 return EqualsTraits<T>::Equals(a, b); | 88 return EqualsTraits<T>::Equals(a, b); |
156 } | 89 } |
157 | 90 |
158 } // namespace internal | 91 } // namespace internal |
159 } // namespace mojo | 92 } // namespace mojo |
160 | 93 |
161 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_CLONE_EQUALS_UTIL_H_ | 94 #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_EQUALS_TRAITS_H_ |
OLD | NEW |