Diffstat (limited to 'libopie2/opiecore/osharedpointer.h') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | libopie2/opiecore/osharedpointer.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/libopie2/opiecore/osharedpointer.h b/libopie2/opiecore/osharedpointer.h new file mode 100644 index 0000000..f19d836 --- a/dev/null +++ b/libopie2/opiecore/osharedpointer.h @@ -0,0 +1,136 @@ +// -*- Mode: C++; -*- +/* + This file is part of the Opie Project + Copyright (C) 2004 Rajko Albrecht <alwin@handhelds.org> + Copyright (C) 2004 Holger Hans Peter Freyther <freyther@handhelds.org> + Copyright (C) The Opie Team <opie-devel@handhelds.org> + =. + .=l. + .>+-= +_;:, .> :=|. This program is free software; you can +.> <`_, > . <= redistribute it and/or modify it under +:`=1 )Y*s>-.-- : the terms of the GNU Library General Public +.="- .-=="i, .._ License as published by the Free Software +- . .-<_> .<> Foundation; either version 2 of the License, + ._= =} : or (at your option) any later version. + .%`+i> _;_. + .i_,=:_. -<s. This program is distributed in the hope that + + . -:. = it will be useful, but WITHOUT ANY WARRANTY; + : .. .:, . . . without even the implied warranty of + =_ + =;=|` MERCHANTABILITY or FITNESS FOR A + _.=:. : :=>`: PARTICULAR PURPOSE. See the GNU +..}^=.= = ; Library General Public License for more +++= -. .` .: details. +: = ...= . :.=- +-. .:....=;==+<; You should have received a copy of the GNU + -_. . . )=. = Library General Public License along with + -- :-=` this library; see the file COPYING.LIB. + If not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. +*/ + + +#ifndef O_SHARED_POINTER_H +#define O_SHARED_POINTER_H + +#include <opie2/osmartpointer.h> + +/*! + * \file osharedpointer.h + * \brief Adapter with Refcounting around any data type + * \author Rajko Albrecht and Holger Hans Peter Freyther + */ + +namespace Opie { +namespace Core { +template<class T> +class OSharedPointerData : public ORefCount { +public: + OSharedPointerData( T* dt ) { + data = dt; + } + + ~OSharedPointerData() { + delete data; + } + + T *data; +}; + + +/** + * \brief A small Adapter around any Pointer + * + * + * + */ +template<class T> +class OSharedPointer { + typedef OSharedPointerData<T> Data; + Data* data; + + void unref() { + if (data) { data->Decr(); if (!data->Shared()) delete data; } + data = 0; + } + +public: + OSharedPointer () { data = 0;} + + OSharedPointer( T* t ) { + data = new Data( t ); + data->Incr(); + } + + OSharedPointer( const OSharedPointer<T>& p ) { + if ( data = p.data ) data->Incr(); + } + + ~OSharedPointer() { + unref(); + } + + OSharedPointer<T> &operator=( const OSharedPointer<T>& p ) { + // already same: nothing to do + if (data == p.data) return *this; + // decouple reference + unref(); + // establish new reference + if (data = p.data) data->Incr(); + return *this; + } + + OSharedPointer<T> &operator=( T *p ) { + unref(); + data = new Data( p ); + data->Incr(); + + return *this; + } + + operator T* () const { return data->data; } + T& operator*() { return *data->data; } + const T& operator*()const { return data->data; } + + //! deref with method call + T* operator-> () {return data->data; } + //! deref with const method call + const T* operator-> ()const {return data->data; } + + + //! supports "if (pointer)" + operator bool () const { return (data != 0 && data->data != 0); } + //! "if (pointer)" as non const + operator bool () { return ( data != 0 && data->data != NULL );} + + //! support if (!pointer)" + bool operator! () const { return (data == 0 || data->data == 0); } + //! support if (!pointer)" as non const + bool operator! () { return (data == 0 || data->data == 0); } +}; + +} +} + +#endif |