| OLD | NEW |
| 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 |
| 11 // TODO: document, more pervasive move support in constructors, small-Fn optimiz
ation | 11 // TODO: document, more pervasive move support in constructors, small-Fn optimiz
ation |
| 12 | 12 |
| 13 #include "SkTemplates.h" | 13 #include "SkTemplates.h" |
| 14 #include "SkTypes.h" | 14 #include "SkTypes.h" |
| 15 | 15 |
| 16 template <typename> class SkFunction; | 16 template <typename> class SkFunction; |
| 17 | 17 |
| 18 template <typename R, typename... Args> | 18 template <typename R, typename... Args> |
| 19 class SkFunction<R(Args...)> { | 19 class SkFunction<R(Args...)> { |
| 20 public: | 20 public: |
| 21 SkFunction() {} | 21 SkFunction() {} |
| 22 | 22 |
| 23 template <typename Fn> | 23 template <typename Fn> |
| 24 SkFunction(const Fn& fn) : fFunction(SkNEW_ARGS(LambdaImpl<Fn>, (fn))) {} | 24 SkFunction(const Fn& fn) |
| 25 : fFunction(new LambdaImpl<Fn>(fn)) {} |
| 25 | 26 |
| 26 SkFunction(R (*fn)(Args...)) : fFunction(SkNEW_ARGS(FnPtrImpl, (fn))) {} | 27 SkFunction(R (*fn)(Args...)) : fFunction(new FnPtrImpl(fn)) {} |
| 27 | 28 |
| 28 SkFunction(const SkFunction& other) { *this = other; } | 29 SkFunction(const SkFunction& other) { *this = other; } |
| 29 SkFunction& operator=(const SkFunction& other) { | 30 SkFunction& operator=(const SkFunction& other) { |
| 30 if (this != &other) { | 31 if (this != &other) { |
| 31 fFunction.reset(other.fFunction ? other.fFunction->clone() : nullptr
); | 32 fFunction.reset(other.fFunction ? other.fFunction->clone() : nullptr
); |
| 32 } | 33 } |
| 33 return *this; | 34 return *this; |
| 34 } | 35 } |
| 35 | 36 |
| 36 R operator()(Args... args) const { | 37 R operator()(Args... args) const { |
| 37 SkASSERT(fFunction.get()); | 38 SkASSERT(fFunction.get()); |
| 38 return fFunction->call(skstd::forward<Args>(args)...); | 39 return fFunction->call(skstd::forward<Args>(args)...); |
| 39 } | 40 } |
| 40 | 41 |
| 41 private: | 42 private: |
| 42 struct Interface { | 43 struct Interface { |
| 43 virtual ~Interface() {} | 44 virtual ~Interface() {} |
| 44 virtual R call(Args...) const = 0; | 45 virtual R call(Args...) const = 0; |
| 45 virtual Interface* clone() const = 0; | 46 virtual Interface* clone() const = 0; |
| 46 }; | 47 }; |
| 47 | 48 |
| 48 template <typename Fn> | 49 template <typename Fn> |
| 49 class LambdaImpl final : public Interface { | 50 class LambdaImpl final : public Interface { |
| 50 public: | 51 public: |
| 51 LambdaImpl(const Fn& fn) : fFn(fn) {} | 52 LambdaImpl(const Fn& fn) : fFn(fn) {} |
| 52 | 53 |
| 53 R call(Args... args) const override { return fFn(skstd::forward<Args>(ar
gs)...); } | 54 R call(Args... args) const override { return fFn(skstd::forward<Args>(ar
gs)...); } |
| 54 Interface* clone() const override { return SkNEW_ARGS(LambdaImpl<Fn>, (f
Fn)); } | 55 Interface* clone() const override { return new LambdaImpl<Fn>(fFn); } |
| 56 |
| 55 private: | 57 private: |
| 56 Fn fFn; | 58 Fn fFn; |
| 57 }; | 59 }; |
| 58 | 60 |
| 59 class FnPtrImpl final : public Interface { | 61 class FnPtrImpl final : public Interface { |
| 60 public: | 62 public: |
| 61 FnPtrImpl(R (*fn)(Args...)) : fFn(fn) {} | 63 FnPtrImpl(R (*fn)(Args...)) : fFn(fn) {} |
| 62 | 64 |
| 63 R call(Args... args) const override { return fFn(skstd::forward<Args>(ar
gs)...); } | 65 R call(Args... args) const override { return fFn(skstd::forward<Args>(ar
gs)...); } |
| 64 Interface* clone() const override { return SkNEW_ARGS(FnPtrImpl, (fFn));
} | 66 Interface* clone() const override { return new FnPtrImpl(fFn); } |
| 67 |
| 65 private: | 68 private: |
| 66 R (*fFn)(Args...); | 69 R (*fFn)(Args...); |
| 67 }; | 70 }; |
| 68 | 71 |
| 69 SkAutoTDelete<Interface> fFunction; | 72 SkAutoTDelete<Interface> fFunction; |
| 70 }; | 73 }; |
| 71 | 74 |
| 72 #endif//SkFunction_DEFINED | 75 #endif//SkFunction_DEFINED |
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