2 // Open Service Platform
3 // Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 // Licensed under the Apache License, Version 2.0 (the License);
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
9 // http://www.apache.org/licenses/LICENSE-2.0
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
19 * @file FBaseColIBidirectionalEnumeratorT.h
20 * @brief This is the header file for the %IBidirectionalEnumeratorT interface.
22 * This header file contains the declarations of the %IBidirectionalEnumeratorT interface.
25 #ifndef _FBASE_COL_IBIDIRECTIONAL_ENUMERATOR_T_H_
26 #define _FBASE_COL_IBIDIRECTIONAL_ENUMERATOR_T_H_
28 #include <FBaseColIEnumeratorT.h>
31 namespace Tizen { namespace Base { namespace Collection
35 * @interface IBidirectionalEnumeratorT
36 * @brief This interface supports a bidirectional iteration over a collection.
41 * An enumerator remains valid as long as the collection remains unchanged.
42 * If changes are made to the collection, such as adding, modifying, or
43 * deleting elements, the enumerator is irrecoverably invalidated. The next call to GetCurrent(), MoveNext(), MovePrevious(), Reset(), or ResetLast() fails (E_INVALID_OPERATION).
45 * The %IBidirectionalEnumeratorT interface supports a bidirectional iteration over a collection.
46 * One can only access the elements in a collection through %IBidirectionalEnumeratorT. The elements cannot be modified through this interface.
49 template< class Type >
50 class IBidirectionalEnumeratorT
51 : public virtual IEnumeratorT< Type >
55 * This polymorphic destructor should be overridden if required. @n
56 * This way, the destructors of the derived classes are called when the destructor of this interface is called.
60 virtual ~IBidirectionalEnumeratorT(void) {}
63 * Moves %IBidirectionalEnumeratorT to the previous element of the collection. @n
64 * A call to the %MovePrevious() method after the ResetLast() method positions the enumerator to the last element in the collection.
68 * @return An error code
69 * @exception E_SUCCESS The method is successful.
70 * @exception E_OUT_OF_RANGE The enumerator has passed the front of the collection.
71 * @exception E_INVALID_OPERATION The current state of the instance prohibits the execution of the specified operation, or
72 * the collection is modified after the enumerator is created.
73 * @see Tizen::Base::Collection::IEnumeratorT< Type >::MoveNext()
76 virtual result MovePrevious(void) = 0;
79 * Positions the enumerator after the last element in the collection.
83 * @return An error code
84 * @exception E_SUCCESS The method is successful.
85 * @exception E_INVALID_OPERATION The current state of the instance prohibits the execution of the specified operation, or
86 * the collection is modified after the enumerator is created.
87 * @see Tizen::Base::Collection::IEnumeratorT< Type >::Reset()
90 virtual result ResetLast(void) = 0;
92 }; // IBidirectionalEnumeratorT
94 }}} // Tizen::Base::Collection
96 #endif // _FBASE_COL_I_BIDIRECTIONAL_ENUMERATOR_T_H_