author | William Roberts <williamr@symbian.org> |
Wed, 31 Mar 2010 12:27:01 +0100 | |
branch | Symbian2 |
changeset 3 | e1b950c65cb4 |
parent 2 | 2fe1408b6811 |
child 4 | 837f303aceeb |
permissions | -rw-r--r-- |
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// Copyright (c) 1999-2009 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 the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.symbianfoundation.org/legal/licencesv10.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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// |
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#ifndef __BABITFLAGS_H__ |
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#define __BABITFLAGS_H__ |
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// System includes |
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#include <e32std.h> |
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/////////////////////////////////////////////////////////////////////////////////////// |
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// ----> TBitFlagsT (header) |
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/////////////////////////////////////////////////////////////////////////////////////// |
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template <class T> |
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class TBitFlagsT |
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/** |
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A simple class which manages the process of setting and clearing |
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flags in an abstract fashion. |
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@publishedAll |
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@released |
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*/ |
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{ |
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/////////////////////////////////////////////////////////////////////////////////////// |
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public: // CONSTRUCT |
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/////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Default constructor - initialize all flags to zero |
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*/ |
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inline TBitFlagsT(); |
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/** |
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* Initialize the whole flag to a certain value |
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*/ |
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inline TBitFlagsT(T aFlags); |
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/** |
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* Copy constructor - initialize this flag object to mirror |
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* that of aFlags. |
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*/ |
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inline TBitFlagsT(const TBitFlagsT& aFlags); |
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/////////////////////////////////////////////////////////////////////////////////////// |
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public: // MANIPULATORS |
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/////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Set all the flags |
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*/ |
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inline void SetAll(); |
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/** |
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* Clear all the flags |
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*/ |
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inline void ClearAll(); |
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/** |
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* Set a particular flag |
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*/ |
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inline void Set(TInt aFlagIndex); |
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/** |
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* Clear a particular flag |
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*/ |
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inline void Clear(TInt aFlagIndex); |
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/** |
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* Set or clear a particular flag |
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* |
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* If aValue is 1, then the flag is set |
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* If aValue is 0, then the flag is cleared |
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*/ |
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inline void Assign(TInt aFlagIndex, TBool aValue); |
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/** |
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* Change the state of a particular flag. If the flag at the specified |
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* index was clear, then it becomes set, otherwise it becomes clear. |
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*/ |
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inline void Toggle(TInt aFlagIndex); |
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/////////////////////////////////////////////////////////////////////////////////////// |
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public: // OPERATORS |
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/////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Check if a particular flag is set or not |
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* |
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* @return A boolean indicating whether the specified flag is set or clear |
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*/ |
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inline TBool operator[](TInt aFlagIndex) const; |
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|
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/** |
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* Assignment operator - assign specific value to the whole flag, replacing |
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* any existing value. |
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*/ |
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inline TBitFlagsT& operator=(const TBitFlagsT& aFlags); |
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/** |
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* Compare the value of the whole flag with a given value. |
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* |
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* @return A boolean indicating whether the two flags are identical. |
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*/ |
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inline TBool operator==(const TBitFlagsT& aFlags); |
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/////////////////////////////////////////////////////////////////////////////////////// |
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public: // ACCESS |
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/////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Check if a particular flag is set |
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*/ |
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inline TBool IsSet(TInt aFlagIndex) const; |
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/** |
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* Check if a particular flag is clear |
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*/ |
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inline TBool IsClear(TInt aFlagIndex) const; |
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* Access the underlying value of the flag. |
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*/ |
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inline T Value() const { return iFlags; } |
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/** |
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* Assign a new value (directly) to this flag object. Replaces any |
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* existing individual flag settings. |
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*/ |
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inline void SetValue(T aFlags) { iFlags = aFlags; } |
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/////////////////////////////////////////////////////////////////////////////////////// |
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private: // INTERNAL |
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/////////////////////////////////////////////////////////////////////////////////////// |
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/** |
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* Generate a mask for a particular flag |
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*/ |
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inline T FlagMask(TInt aFlagIndex) const; |
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/////////////////////////////////////////////////////////////////////////////////////// |
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public: // MEMBER DATA |
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/////////////////////////////////////////////////////////////////////////////////////// |
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// The underlying object container which represents the flags. |
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T iFlags; |
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}; |
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/** |
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Type definitions |
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@publishedAll |
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@released |
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*/ |
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typedef TBitFlagsT<TUint8> TBitFlags8; |
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// |
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Type definitions |
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@publishedAll |
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@released |
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*/ |
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typedef TBitFlagsT<TUint16> TBitFlags16; |
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// |
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Type definitions |
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@publishedAll |
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@released |
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*/ |
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typedef TBitFlagsT<TUint32> TBitFlags32; |
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// |
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typedef TBitFlags32 TBitFlags; |
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/////////////////////////////////////////////////////////////////////////////////////// |
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// ----> TBitFlagsT (inlines) |
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/////////////////////////////////////////////////////////////////////////////////////// |
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template <class T> |
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inline TBitFlagsT<T>::TBitFlagsT() : iFlags(T(0)) |
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{} |
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template <class T> |
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inline TBitFlagsT<T>::TBitFlagsT(T aFlags) : iFlags(aFlags) |
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{} |
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template <class T> |
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inline TBitFlagsT<T>::TBitFlagsT(const TBitFlagsT<T>& aFlags) : iFlags(aFlags.iFlags) |
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{} |
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template <class T> |
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inline T TBitFlagsT<T>::FlagMask(TInt aFlagIndex) const |
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{ return T(T(1)<<aFlagIndex); } |
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template <class T> |
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inline TBool TBitFlagsT<T>::IsSet(TInt aFlagIndex) const |
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{ return iFlags & FlagMask(aFlagIndex); } |
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template <class T> |
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inline TBool TBitFlagsT<T>::IsClear(TInt aFlagIndex) const |
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{ return !IsSet(aFlagIndex); } |
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template <class T> |
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inline void TBitFlagsT<T>::Set(TInt aFlagIndex) |
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{ iFlags = T(iFlags | FlagMask(aFlagIndex)); } |
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template <class T> |
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inline void TBitFlagsT<T>::Clear(TInt aFlagIndex) |
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{ iFlags = T(iFlags & ~(FlagMask(aFlagIndex))); } |
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template <class T> |
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inline void TBitFlagsT<T>::Assign(TInt aFlagIndex, TBool aVal) |
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{ if (aVal) Set(aFlagIndex); else Clear(aFlagIndex); } |
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template <class T> |
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inline void TBitFlagsT<T>::Toggle(TInt aFlagIndex) |
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{ iFlags = T(iFlags^FlagMask(aFlagIndex)); } |
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inline TBool TBitFlagsT<T>::operator[](TInt aFlagIndex) const |
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{ return IsSet(aFlagIndex); } |
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template <class T> |
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inline TBitFlagsT<T>& TBitFlagsT<T>::operator=(const TBitFlagsT<T>& aFlags) |
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{ iFlags = aFlags.iFlags; return *this; } |
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template <class T> |
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inline TBool TBitFlagsT<T>::operator==(const TBitFlagsT<T>& aFlags) |
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{ return iFlags == aFlags.Value(); } |
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template <class T> |
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inline void TBitFlagsT<T>::SetAll() |
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{ iFlags = T(~(T(0))); } |
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template <class T> |
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inline void TBitFlagsT<T>::ClearAll() |
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{ iFlags = T(0); } |
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#endif |