author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 22 Jan 2010 11:06:30 +0200 | |
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permissions | -rw-r--r-- |
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// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// RMap template class implementation. |
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// |
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// |
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/** |
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Template function that compares two objects of type TPair<KEY, DATA> and |
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returns {negative, 0, positive} depending on the comparison result. |
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In order the comparison to work, the KEY template parameter has to have |
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"-" operation defined - either native or overloaded "-" operator. |
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Used by RMap<KEY, DATA> template class. |
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Note: This template function works only on objects, which have defined a "-" operation. |
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@param aLeft The first TPair<KEY, DATA> to be compared |
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@param aRight The second TPair<KEY, DATA> to be compared |
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@return An integer value, which is: |
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0, if the objects are equal; |
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negative number, the first object is bigger than the second object |
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positive number, the first object is smaller than the second object |
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@internalComponent |
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*/ |
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template <class KEY, class DATA> |
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TInt Compare(const TPair<KEY, DATA>& aLeft, const TPair<KEY, DATA>& aRight) |
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{ |
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return aRight.iKey - aLeft.iKey; |
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} |
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/** |
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@param aKey Key part of TPair object |
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@param aData Data part of TPair object |
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*/ |
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template <class KEY, class DATA> |
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TPair<KEY, DATA>::TPair(const KEY& aKey, const DATA& aData) : |
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iKey(aKey), |
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iData(aData) |
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{ |
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} |
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/** |
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@param aKey Key part of TPair object |
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*/ |
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template <class KEY, class DATA> |
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TPair<KEY, DATA>::TPair(const KEY& aKey) : |
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iKey(aKey) |
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{ |
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} |
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/** |
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*/ |
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template <class KEY, class DATA> |
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TPair<KEY, DATA>::TPair() |
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{ |
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} |
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/** |
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@param aOrder An object of TLinearOrder< TPair<KEY, DATA> type, which will be used when |
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new elements are inserted into the collection. |
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*/ |
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template <class KEY, class DATA> |
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RMap<KEY, DATA>::RMap(const TLinearOrder< TPair<KEY, DATA> >& aOrder) : |
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iOrder(aOrder) |
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{ |
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} |
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/** |
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Closes RMap instance and destroy all RMap data. |
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*/ |
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template <class KEY, class DATA> |
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void RMap<KEY, DATA>::Close() |
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{ |
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iCol.Close(); |
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} |
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/** |
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This method will create and insert new (KEY, DATA) pair in the map. |
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If the operation fails, the method will return some of system wide error codes. |
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RMap instance does not allow duplicated TPair objects in the collection. |
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Actually it dependes on the supplied in the constructor aOrder instance. |
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@param aKey The key part of TPair object, which will be inserted |
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@param aData The data part of TPair object, which will be inserted |
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@return KErrNone if successful, otherwise one of the system-wide error codes |
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*/ |
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template <class KEY, class DATA> |
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TInt RMap<KEY, DATA>::Insert(const KEY& aKey, const DATA& aData) |
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{ |
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return iCol.InsertInOrder(TPair<KEY, DATA>(aKey, aData), iOrder); |
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} |
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/** |
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This method removes an element with aKey key from the map. |
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If there is no such element in the map, the debug verison of the method will panic. |
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The destructor of the object, which is about to be removed, is not called. |
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@param aKey The key of TPair object, which has to be removed from the collection. |
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106 |
*/ |
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107 |
template <class KEY, class DATA> |
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void RMap<KEY, DATA>::Remove(const KEY& aKey) |
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109 |
{ |
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TInt index = iCol.FindInOrder(TPair<KEY, DATA>(aKey), iOrder); |
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index != KErrNotFound ? iCol.Remove(index) : __ASSERT(0); |
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112 |
} |
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113 |
|
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114 |
/** |
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115 |
This method performs a search for an element with aKey key in the map. |
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116 |
If such element exists, the method will return a const reference to the element's data. |
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If not, then the method will panic. |
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@param aKey The key of TPair object, a reference to which DATA will be returned |
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@return A const reference to the matching DATA object. |
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120 |
*/ |
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121 |
template <class KEY, class DATA> |
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const DATA& RMap<KEY, DATA>::operator[](const KEY& aKey) const |
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123 |
{ |
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TInt index = iCol.FindInOrder(TPair<KEY, DATA>(aKey), iOrder); |
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__ASSERT_ALWAYS(index != KErrNotFound, User::Invariant()); |
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return iCol[index].iData; |
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127 |
} |
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128 |
|
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129 |
/** |
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130 |
This method performs a search for an element with aKey key in the map. |
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131 |
If such element exists, the method will set the element's data in aData parameter and |
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return KErrNone. |
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133 |
If not, then the method will return KErrNotFound. |
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134 |
@param aKey The key of TPair object, a reference to which DATA will be returned in aData |
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135 |
parameter, if found |
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@param aData An output parameter, it references the location, where the found data will be stored. |
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@return KErrNone An element with aKey key exists in the map, the data part is stored in aData. |
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@return KErrNotFound No map element with aKey key found. |
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139 |
*/ |
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140 |
template <class KEY, class DATA> |
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TInt RMap<KEY, DATA>::Find(const KEY& aKey, DATA& aData) const |
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142 |
{ |
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TInt index = iCol.FindInOrder(TPair<KEY, DATA>(aKey), iOrder); |
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if(index != KErrNotFound) |
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145 |
{ |
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aData = iCol[index].iData; |
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147 |
} |
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return index; |
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149 |
} |
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150 |
|
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151 |
/** |
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152 |
This method returns the number of elements in the map. |
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@return Map elements count. |
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154 |
*/ |
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155 |
template <class KEY, class DATA> |
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TInt RMap<KEY, DATA>::Count() const |
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157 |
{ |
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return iCol.Count(); |
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159 |
} |
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160 |
|
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161 |
/** |
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Initializes TMapIterator instance. |
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@param aMap A const reference to the RMap object, which will be iterated. |
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164 |
*/ |
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165 |
template <class KEY, class DATA> |
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TMapIterator<KEY, DATA>::TMapIterator(const RMap<KEY, DATA>& aMap) : |
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167 |
iMap(aMap), |
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168 |
iIndex(0) |
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169 |
{ |
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170 |
} |
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171 |
|
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172 |
/** |
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173 |
Resets TMapIterator iterator for a new scan from the beginning of the controlled map sequence. |
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174 |
*/ |
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175 |
template <class KEY, class DATA> |
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176 |
void TMapIterator<KEY, DATA>::Reset() |
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177 |
{ |
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iIndex = 0; |
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179 |
} |
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180 |
|
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181 |
/** |
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182 |
If iterator's current position is not beyond the end of the map, |
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183 |
the iterator will retrieve current map entry into aPair argument, advance iterator position |
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by 1 and return ETrue. |
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Otherwise the iterator will return EFalse. |
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186 |
@param aPair An output parameter, which references the location, where the next RMap element will be stored. |
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@return ETrue The next RMap element successfully loaded into aPair parameter. This is not the |
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end of RMap collection. |
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189 |
@return EFalse The next RMap element successfully loaded into aPair parameter. This is the |
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end of RMap collection. Do not call Next() anymore. |
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191 |
*/ |
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192 |
template <class KEY, class DATA> |
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TBool TMapIterator<KEY, DATA>::Next(TPair<KEY, DATA>& aPair) const |
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194 |
{ |
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return (iIndex < iMap.iCol.Count()) ? aPair = iMap.iCol[iIndex++], ETrue : EFalse; |
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196 |
} |