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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 | |
ikilpatrick
2016/10/31 21:36:08
would prefer to wait until we have this in wtf ins
Gleb Lanbin
2016/10/31 23:08:18
deleted
| |
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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