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Side by Side Diff: mojo/public/cpp/bindings/wtf_array.h

Issue 2038273002: Remove base/move.h (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: is_constructible Created 4 years, 6 months ago
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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_WTF_ARRAY_H_ 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_
6 #define MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_ 6 #define MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_
7 7
8 #include <stddef.h> 8 #include <stddef.h>
9 #include <utility> 9 #include <utility>
10 10
11 #include "base/move.h" 11 #include "base/macros.h"
12 #include "mojo/public/cpp/bindings/lib/array_internal.h" 12 #include "mojo/public/cpp/bindings/lib/array_internal.h"
13 #include "mojo/public/cpp/bindings/lib/bindings_internal.h" 13 #include "mojo/public/cpp/bindings/lib/bindings_internal.h"
14 #include "mojo/public/cpp/bindings/lib/template_util.h" 14 #include "mojo/public/cpp/bindings/lib/template_util.h"
15 #include "mojo/public/cpp/bindings/type_converter.h" 15 #include "mojo/public/cpp/bindings/type_converter.h"
16 #include "third_party/WebKit/Source/wtf/Vector.h" 16 #include "third_party/WebKit/Source/wtf/Vector.h"
17 17
18 namespace mojo { 18 namespace mojo {
19 19
20 // Represents an array backed by WTF::Vector. Comparing with WTF::Vector, 20 // Represents an array backed by WTF::Vector. Comparing with WTF::Vector,
21 // mojo::WTFArray is move-only and can be null. 21 // mojo::WTFArray is move-only and can be null.
22 // It is easy to convert between WTF::Vector<T> and mojo::WTFArray<T>: 22 // It is easy to convert between WTF::Vector<T> and mojo::WTFArray<T>:
23 // - constructor WTFArray(WTF::Vector<T>&&) takes the contents of a 23 // - constructor WTFArray(WTF::Vector<T>&&) takes the contents of a
24 // WTF::Vector<T>; 24 // WTF::Vector<T>;
25 // - method PassStorage() passes the underlying WTF::Vector. 25 // - method PassStorage() passes the underlying WTF::Vector.
26 template <typename T> 26 template <typename T>
27 class WTFArray { 27 class WTFArray {
28 MOVE_ONLY_TYPE_FOR_CPP_03(WTFArray);
29
30 public: 28 public:
31 using Data_ = internal::Array_Data< 29 using Data_ = internal::Array_Data<
32 typename internal::GetDataTypeAsArrayElement<T>::Data>; 30 typename internal::GetDataTypeAsArrayElement<T>::Data>;
33 using Element = T; 31 using Element = T;
34 32
35 // Constructs an empty array. 33 // Constructs an empty array.
36 WTFArray() : is_null_(false) {} 34 WTFArray() : is_null_(false) {}
37 // Constructs a null array. 35 // Constructs a null array.
38 WTFArray(std::nullptr_t null_pointer) : is_null_(true) {} 36 WTFArray(std::nullptr_t null_pointer) : is_null_(true) {}
39 37
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168 if (size() != other.size()) 166 if (size() != other.size())
169 return false; 167 return false;
170 for (size_t i = 0; i < size(); ++i) { 168 for (size_t i = 0; i < size(); ++i) {
171 if (!internal::Equals(at(i), other.at(i))) 169 if (!internal::Equals(at(i), other.at(i)))
172 return false; 170 return false;
173 } 171 }
174 return true; 172 return true;
175 } 173 }
176 174
177 private: 175 private:
176 // TODO(dcheng): Use an explicit conversion operator.
178 typedef WTF::Vector<T> WTFArray::*Testable; 177 typedef WTF::Vector<T> WTFArray::*Testable;
179 178
180 public: 179 public:
181 operator Testable() const { 180 operator Testable() const {
182 // When the array is set to null, the underlying storage |vec_| shouldn't 181 // When the array is set to null, the underlying storage |vec_| shouldn't
183 // contain any elements. 182 // contain any elements.
184 DCHECK(!is_null_ || vec_.isEmpty()); 183 DCHECK(!is_null_ || vec_.isEmpty());
185 return is_null_ ? 0 : &WTFArray::vec_; 184 return is_null_ ? 0 : &WTFArray::vec_;
186 } 185 }
187 186
188 private: 187 private:
189 // Forbid the == and != operators explicitly, otherwise WTFArray will be 188 // Forbid the == and != operators explicitly, otherwise WTFArray will be
190 // converted to Testable to do == or != comparison. 189 // converted to Testable to do == or != comparison.
191 template <typename U> 190 template <typename U>
192 bool operator==(const WTFArray<U>& other) const = delete; 191 bool operator==(const WTFArray<U>& other) const = delete;
193 template <typename U> 192 template <typename U>
194 bool operator!=(const WTFArray<U>& other) const = delete; 193 bool operator!=(const WTFArray<U>& other) const = delete;
195 194
196 void Take(WTFArray* other) { 195 void Take(WTFArray* other) {
197 operator=(nullptr); 196 operator=(nullptr);
198 Swap(other); 197 Swap(other);
199 } 198 }
200 199
201 WTF::Vector<T> vec_; 200 WTF::Vector<T> vec_;
202 bool is_null_; 201 bool is_null_;
202
203 DISALLOW_COPY_AND_ASSIGN(WTFArray);
203 }; 204 };
204 205
205 } // namespace mojo 206 } // namespace mojo
206 207
207 #endif // MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_ 208 #endif // MOJO_PUBLIC_CPP_BINDINGS_WTF_ARRAY_H_
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