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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef ptr_util_h |
| 6 #define ptr_util_h |
| 7 |
| 8 #include <memory> |
| 9 #include <utility> |
| 10 |
| 11 // This is a partial copy of base/memory/ptr_util.h that sadly cannot be used in |
| 12 // Blink because of "-base" from third_party's include_rules. |
| 13 // TODO(glebl): move to WebKit/base? similar to |
| 14 // third_party/pdfium/third_party/base/ptr_util.h |
| 15 |
| 16 namespace blink { |
| 17 |
| 18 namespace { |
| 19 |
| 20 template <typename T> |
| 21 struct MakeUniqueResult { |
| 22 using Scalar = std::unique_ptr<T>; |
| 23 }; |
| 24 |
| 25 template <typename T> |
| 26 struct MakeUniqueResult<T[]> { |
| 27 using Array = std::unique_ptr<T[]>; |
| 28 }; |
| 29 |
| 30 template <typename T, size_t N> |
| 31 struct MakeUniqueResult<T[N]> { |
| 32 using Invalid = void; |
| 33 }; |
| 34 |
| 35 } // namespace |
| 36 |
| 37 // Helper to construct an object wrapped in a std::unique_ptr. This is an |
| 38 // implementation of C++14's std::MakeUnique that can be used in Chrome. |
| 39 // |
| 40 // MakeUnique<T>(args) should be preferred over WrapUnique(new T(args)): bare |
| 41 // calls to `new` should be treated with scrutiny. |
| 42 // |
| 43 // Usage: |
| 44 // // ptr is a std::unique_ptr<std::string> |
| 45 // auto ptr = MakeUnique<std::string>("hello world!"); |
| 46 // |
| 47 // // arr is a std::unique_ptr<int[]> |
| 48 // auto arr = MakeUnique<int[]>(5); |
| 49 |
| 50 // Overload for non-array types. Arguments are forwarded to T's constructor. |
| 51 template <typename T, typename... Args> |
| 52 typename MakeUniqueResult<T>::Scalar MakeUnique(Args&&... args) { |
| 53 return std::unique_ptr<T>(new T(std::forward<Args>(args)...)); |
| 54 } |
| 55 |
| 56 } // namespace blink |
| 57 #endif // ptr_util_h |
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