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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkFunction_DEFINED | 8 #ifndef SkFunction_DEFINED |
9 #define SkFunction_DEFINED | 9 #define SkFunction_DEFINED |
10 | 10 |
(...skipping 17 matching lines...) Expand all Loading... |
28 SkFunction(const SkFunction& other) { *this = other; } | 28 SkFunction(const SkFunction& other) { *this = other; } |
29 SkFunction& operator=(const SkFunction& other) { | 29 SkFunction& operator=(const SkFunction& other) { |
30 if (this != &other) { | 30 if (this != &other) { |
31 fFunction.reset(other.fFunction ? other.fFunction->clone() : nullptr
); | 31 fFunction.reset(other.fFunction ? other.fFunction->clone() : nullptr
); |
32 } | 32 } |
33 return *this; | 33 return *this; |
34 } | 34 } |
35 | 35 |
36 R operator()(Args... args) const { | 36 R operator()(Args... args) const { |
37 SkASSERT(fFunction.get()); | 37 SkASSERT(fFunction.get()); |
38 return fFunction->call(Forward(args)...); | 38 return fFunction->call(skstd::forward<Args>(args)...); |
39 } | 39 } |
40 | 40 |
41 private: | 41 private: |
42 // ~= std::forward. This moves its argument if possible, falling back to a
copy if not. | |
43 template <typename T> static T&& Forward(T& v) { return (T&&)v; } | |
44 | |
45 struct Interface { | 42 struct Interface { |
46 virtual ~Interface() {} | 43 virtual ~Interface() {} |
47 virtual R call(Args...) const = 0; | 44 virtual R call(Args...) const = 0; |
48 virtual Interface* clone() const = 0; | 45 virtual Interface* clone() const = 0; |
49 }; | 46 }; |
50 | 47 |
51 template <typename Fn> | 48 template <typename Fn> |
52 class LambdaImpl final : public Interface { | 49 class LambdaImpl final : public Interface { |
53 public: | 50 public: |
54 LambdaImpl(const Fn& fn) : fFn(fn) {} | 51 LambdaImpl(const Fn& fn) : fFn(fn) {} |
55 | 52 |
56 R call(Args... args) const override { return fFn(Forward(args)...); } | 53 R call(Args... args) const override { return fFn(skstd::forward<Args>(ar
gs)...); } |
57 Interface* clone() const override { return SkNEW_ARGS(LambdaImpl<Fn>, (f
Fn)); } | 54 Interface* clone() const override { return SkNEW_ARGS(LambdaImpl<Fn>, (f
Fn)); } |
58 private: | 55 private: |
59 Fn fFn; | 56 Fn fFn; |
60 }; | 57 }; |
61 | 58 |
62 class FnPtrImpl final : public Interface { | 59 class FnPtrImpl final : public Interface { |
63 public: | 60 public: |
64 FnPtrImpl(R (*fn)(Args...)) : fFn(fn) {} | 61 FnPtrImpl(R (*fn)(Args...)) : fFn(fn) {} |
65 | 62 |
66 R call(Args... args) const override { return fFn(Forward(args)...); } | 63 R call(Args... args) const override { return fFn(skstd::forward<Args>(ar
gs)...); } |
67 Interface* clone() const override { return SkNEW_ARGS(FnPtrImpl, (fFn));
} | 64 Interface* clone() const override { return SkNEW_ARGS(FnPtrImpl, (fFn));
} |
68 private: | 65 private: |
69 R (*fFn)(Args...); | 66 R (*fFn)(Args...); |
70 }; | 67 }; |
71 | 68 |
72 SkAutoTDelete<Interface> fFunction; | 69 SkAutoTDelete<Interface> fFunction; |
73 }; | 70 }; |
74 | 71 |
75 #endif//SkFunction_DEFINED | 72 #endif//SkFunction_DEFINED |
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