1 #ifndef DALI_ANY_TYPE_H
2 #define DALI_ANY_TYPE_H
5 * Copyright (c) 2020 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 <cstddef> // NULL
23 #include <typeinfo> // operator typeid
26 #include <dali/public-api/common/dali-common.h>
31 * @addtogroup dali_core_object
36 * @brief Stores a value of any type.
40 * Any uintVariable = 5u;
41 * Any floatVariable( 4.5f );
42 * Any strVariable( std::string( "Hello world" ) );
44 * uint32_t variable = AnyCast< uint32_t >( uintVariable );
45 * if ( typeid( int ) == uintVariable.GetType() )
53 * @brief Default constructor.
59 * @brief Destructor. Free resources.
65 * @brief Passes Assert message.
68 * @param[in] assertMessage Assert message to report
70 DALI_CORE_API static void AssertAlways(const char* assertMessage);
73 * @brief Constructs a Any type with the given value.
76 * @param[in] value The given value
78 template<typename Type>
79 Any(const Type& value)
80 : mContainer(new AnyContainerImpl<Type>(value))
85 * @brief Copy Constructor.
87 * @param[in] any Any to be copied
91 // If container isn't empty then copy the container?
92 if(nullptr != any.mContainer)
94 mContainer = any.mContainer->mCloneFunc(*any.mContainer);
98 // Otherwise mark new container as empty
104 * @brief Assigns a given value to the Any type.
107 * @param[in] value The given value
108 * @return A reference to this
109 * @note If the types are different, then the current container will be re-created.
112 template<typename Type>
113 Any& operator=(const Type& value)
115 // If the container is empty then assign the new value
116 if(nullptr == mContainer)
118 mContainer = new AnyContainerImpl<Type>(value);
122 // Check to see if this type is compatible with current container?
123 if(mContainer->GetType() == typeid(Type))
125 // Same type so just set the new value
126 static_cast<AnyContainerImpl<Type>*>(mContainer)->SetValue(value);
130 // Incompatible types, so delete old container and assign a new one with this type and value
131 mContainer->mDeleteFunc(mContainer);
132 mContainer = new AnyContainerImpl<Type>(value);
139 * @brief Assignment operator.
142 * @param[in] any Any to be assigned which contains a value of identical type to current contents.
143 * @return A reference to this
144 * @exception DaliException If parameter any is of a different type.
147 DALI_CORE_API Any& operator=(const Any& any);
150 * @brief Gets a value of type Type from container.
153 * @param[in] type destination of type Type to write to
155 template<typename Type>
156 void Get(Type& type) const
162 * @brief Returns the type info of the stored value.
165 * @return The std::type_info of the stored value or the type info of the void
166 * type if there is no value stored
168 DALI_CORE_API const std::type_info& GetType() const;
171 * @brief Retrieves the stored value in the Any type.
174 * @return The stored value
176 template<typename Type>
177 const Type& Get() const
179 if(nullptr == mContainer)
181 AssertAlways("Any::Get(). mContainer is NULL");
183 else if(mContainer->GetType() != typeid(Type)) // Check if the value has the same value than the Any type.
185 AssertAlways("Any::Get(). Trying to retrieve a value of a different type than the template one.");
187 return static_cast<AnyContainerImpl<Type>*>(mContainer)->GetValue();
191 * @brief Returns pointer of Type to the value stored.
194 * @return pointer to the value, or NULL if no value is contained
196 template<typename Type>
199 if(nullptr == mContainer)
203 // Check if the value has the same value than the Any type.
204 if(mContainer->GetType() != typeid(Type))
206 AssertAlways("Any::GetPointer(). Trying to retrieve a pointer to a value of a different type than the template one.");
208 return static_cast<AnyContainerImpl<Type>*>(mContainer)->GetPointerToValue();
212 * @brief Returns pointer of Type to the value stored.
215 * @return pointer to the value, or NULL if no value is contained
217 template<typename Type>
218 const Type* GetPointer() const
220 if(nullptr == mContainer)
224 // Check if the value has the same value than the Any type.
225 if(mContainer->GetType() != typeid(Type))
227 AssertAlways("Any::GetPointer(). Trying to retrieve a pointer to a value of a different type than the template one.");
229 return static_cast<AnyContainerImpl<Type>*>(mContainer)->GetPointerToValue();
233 * @brief Returns whether container holds a value.
236 * @return @c true if the container is empty, else @c false
240 return (nullptr == mContainer) ? true : false;
243 struct AnyContainerBase; // Forward declaration for typedef
244 using CloneFunc = AnyContainerBase* (*)(const AnyContainerBase&);
246 using DeleteFunc = void (*)(const AnyContainerBase*);
249 * @brief Base container to hold type for match verification and instance cloning function.
253 struct AnyContainerBase
256 * @brief Constructor of base container.
259 * @param[in] type typeid of container
260 * @param[in] cloneFunc Cloning function to replicate this container type
261 * @param[in] deleteFunc Deleting function to destroy this container type
263 AnyContainerBase(const std::type_info& type, CloneFunc cloneFunc, DeleteFunc deleteFunc)
265 mCloneFunc(cloneFunc),
266 mDeleteFunc(deleteFunc)
271 * @brief Gets the typeid of this container.
276 const std::type_info& GetType() const
281 const ::std::type_info& mType; // typeID
282 CloneFunc mCloneFunc; // cloning function for this container
283 DeleteFunc mDeleteFunc; // deleting function for this container
287 * @brief Templated Clone function from container base.
290 * @param[in] base The reference to container
292 template<typename Type>
293 struct AnyContainerImplCloner
295 static AnyContainerBase* Clone(const AnyContainerBase& base)
297 return new AnyContainerImpl<Type>(static_cast<AnyContainerImpl<Type> >(base));
302 * @brief Templated Delete function from container base.
305 * @param[in] base The pointer to container
307 template<typename Type>
308 struct AnyContainerImplDelete
310 static void Delete(const AnyContainerBase* base)
312 delete(static_cast<const AnyContainerImpl<Type>*>(base));
317 * @brief Templated class to hold value for type.
321 template<typename Type>
322 class AnyContainerImpl : public AnyContainerBase
326 * @brief Constructor to create container holding value of type Type.
329 * @param[in] value Value of Type
331 AnyContainerImpl(const Type& value)
332 : AnyContainerBase(typeid(Type),
333 static_cast<CloneFunc>(&AnyContainerImplCloner<Type>::Clone),
334 static_cast<DeleteFunc>(&AnyContainerImplDelete<Type>::Delete)),
340 * @brief Constructor to create new container of type from and existing container (cloning).
343 * @param[in] base The reference to base container to copy from
345 AnyContainerImpl(const AnyContainerBase& base)
346 : AnyContainerBase(typeid(Type),
347 static_cast<CloneFunc>(&AnyContainerImplCloner<Type>::Clone),
348 static_cast<DeleteFunc>(&AnyContainerImplDelete<Type>::Delete))
350 mValue = static_cast<const AnyContainerImpl&>(base).GetValue();
354 * @brief Gets the container's stored value.
357 * @return Value of type Type
359 const Type& GetValue() const
365 * @brief Sets the container's stored value.
368 * @param[in] value Value of type Type
370 void SetValue(const Type& value)
376 * @brief Gets a pointer to the value held.
379 * @return Pointer to the value of type Type
381 Type* GetPointerToValue()
383 return static_cast<Type*>(&mValue);
387 * @brief Gets a pointer to the value held.
390 * @return Pointer to the value of type Type
392 const Type* GetPointerToValue() const
394 return static_cast<const Type*>(&mValue);
401 AnyContainerBase* mContainer;
405 * AnyCast helper functions
409 * @brief Extracts a pointer to the held type of an Any object from a pointer to that Any object (NULL if empty).
412 * @param[in] any Pointer to an Any object
414 * @return Pointer to the Type held
416 template<typename Type>
417 inline Type* AnyCast(Any* any)
419 return any->GetPointer<Type>();
423 * @brief Extracts a const pointer to the held type of an Any object from a pointer to that Any object (NULL if empty).
426 * @param[in] any const Pointer to an Any object
428 * @return const Pointer to the Type held
430 template<typename Type>
431 inline const Type* AnyCast(const Any* any)
433 return any->GetPointer<Type>();
437 * @brief Extracts a held value of type Type from an Any object from a reference to that Any object.
440 * @param[in] any The reference to an Any object
442 * @return Type value of type Type
444 template<typename Type>
445 inline Type AnyCast(Any& any)
447 return any.Get<Type>();
451 * @brief Extracts a held value of type Type from an Any object from a const reference to that Any object.
454 * @param[in] any The reference to an Any object
456 * @return Type value of type Type
458 template<typename Type>
459 inline Type AnyCast(const Any& any)
461 return any.Get<Type>();
465 * @brief Extracts a reference to the held value of type Type from an Any object from a reference to that Any object
468 * @param[in] any The reference to an Any object
470 * @return A reference to the Type value of type Type
472 template<typename Type>
473 inline Type& AnyCastReference(Any& any)
475 return any.Get<Type>();
479 * @brief Extracts a const reference to the held value of type Type from an Any object from a const reference to that Any object.
482 * @param[in] any The reference to an Any object
484 * @return A const reference to the Type value of type Type
486 template<typename Type>
487 inline const Type& AnyCastReference(const Any& any)
489 return any.Get<Type>();
497 #endif // DALI_ANY_TYPE_H