1 #ifndef __DALI_FUNCTOR_DELEGATE_H__
2 #define __DALI_FUNCTOR_DELEGATE_H__
5 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
22 #include <dali/public-api/common/dali-common.h>
27 * @addtogroup dali_core_signals
32 * @brief Dispatcher to call a functor
35 template< typename T >
36 struct FunctorDispatcher
39 * @brief Call a function object.
42 * @param[in] functorPtr The functor to call.
44 static void Dispatch( void* functorPtr )
46 // "downcast" the functor type back to the correct one
47 T* functor = reinterpret_cast< T* >( functorPtr );
53 * @brief Dispatcher to delete a functor object
56 template< typename T >
57 struct FunctorDestroyer
60 * @brief Dispatcher to delete an object
63 static void Delete( void* functorPtr )
65 // FunctorDelegate owns the object but we're the only one who knows the real type so need
66 // to delete by "downcasting" from void* to the correct type
67 delete reinterpret_cast< T* >( functorPtr );
72 * @brief Used to connect a void() functor to a signal via BaseObject::SignalConnect()
75 class DALI_IMPORT_API FunctorDelegate
80 * @brief Constructor which copies a function object.
83 * @param[in] functor The functor object to copy, either a class with operator() or a C function
84 * @return A pointer to the new function object
86 template< typename T >
87 static FunctorDelegate* New( const T& functor )
89 return new FunctorDelegate( reinterpret_cast< void* >( new T( functor ) ), // heap allocate the functor
90 reinterpret_cast< FunctorDelegate::Dispatcher >( &FunctorDispatcher<T>::Dispatch ),
91 reinterpret_cast< FunctorDelegate::Destructor >( &FunctorDestroyer<T>::Delete ) );
95 * @brief Non-virtual destructor; not intended as a base class.
101 * @brief Function to call the function or member function dispatcher
109 * @brief Used to call the correct function.
112 typedef void (*Dispatcher)( void* objectPtr );
115 * @brief Used to destroy mObjectPointer.
118 typedef void(*Destructor)( void* objectPtr );
124 FunctorDelegate( const FunctorDelegate& rhs );
130 const FunctorDelegate& operator=( const FunctorDelegate& rhs );
133 * @brief Private constructor.
136 * @param[in] functorPtr A newly allocated functor object (takes ownership)
137 * @param dispatcher Used to call the actual function.
138 * @param destructor Used to delete the owned functor object.
140 FunctorDelegate( void* functorPtr, Dispatcher dispatcher, Destructor destructor );
142 public: // Data for deriving classes & Dispatchers
144 void* mFunctorPointer; ///< Functor that will be called
145 Dispatcher mMemberFunctionDispatcher; ///< Dispatcher for member functions
146 Destructor mDestructorDispatcher; ///< Destructor for owned objects
154 #endif // __DALI_FUNCTOR_DELEGATE_H__