2 // Copyright (c) 2012 Samsung Electronics Co., Ltd.
4 // Licensed under the Apache License, Version 2.0 (the License);
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
8 // http://www.apache.org/licenses/LICENSE-2.0
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
18 * @file FBaseColIBidirectionalEnumeratorT.h
19 * @brief This is the header file for the %IBidirectionalEnumeratorT interface.
21 * This header file contains the declarations of the %IBidirectionalEnumeratorT interface.
24 #ifndef _FBASE_COL_IBIDIRECTIONAL_ENUMERATOR_T_H_
25 #define _FBASE_COL_IBIDIRECTIONAL_ENUMERATOR_T_H_
27 #include <FBaseColIEnumeratorT.h>
30 namespace Tizen { namespace Base { namespace Collection
34 * @interface IBidirectionalEnumeratorT
35 * @brief This interface supports a bidirectional iteration over a collection.
39 * @remarks An enumerator remains valid as long as the collection remains unchanged.@n
40 * If changes are made to the collection, such as adding, modifying, or
41 * deleting elements, the enumerator is irrecoverably invalidated. @n
42 * The next call to GetCurrent(), MoveNext(), MovePrevious(), Reset(), or ResetLast() fails (@c E_INVALID_OPERATION).
44 * The %IBidirectionalEnumeratorT interface supports a bidirectional iteration over a collection.
45 * One can only access the elements in a collection through %IBidirectionalEnumeratorT. The elements cannot be modified through this interface.
48 template< class Type >
49 class IBidirectionalEnumeratorT
50 : public virtual IEnumeratorT< Type >
54 * This polymorphic destructor should be overridden if required. @n
55 * This way, the destructors of the derived classes are called when the destructor of this interface is called.
59 virtual ~IBidirectionalEnumeratorT(void) {}
62 * Moves %IBidirectionalEnumeratorT to the previous element of the collection. @n
63 * A call to the %MovePrevious() method after the ResetLast() method positions the enumerator to the last element in the collection.
67 * @return An error code
68 * @exception E_SUCCESS The method is successful.
69 * @exception E_OUT_OF_RANGE The enumerator has passed the front of the collection.
70 * @exception E_INVALID_OPERATION Either of the following conditions has occurred:
71 * - 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()
75 virtual result MovePrevious(void) = 0;
78 * Positions the enumerator after the last element in the collection.
82 * @return An error code
83 * @exception E_SUCCESS The method is successful.
84 * @exception E_INVALID_OPERATION Either of the following conditions has occurred:
85 * - The current state of the instance prohibits the execution of the specified operation.
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_