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akonadi

sharedvaluepool_p.h
00001 /*
00002     Copyright (c) 2010 Volker Krause <vkrause@kde.org>
00003 
00004     This library is free software; you can redistribute it and/or modify it
00005     under the terms of the GNU Library General Public License as published by
00006     the Free Software Foundation; either version 2 of the License, or (at your
00007     option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful, but WITHOUT
00010     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00011     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00012     License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to the
00016     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017     02110-1301, USA.
00018 */
00019 
00020 #ifndef AKONADI_SHAREDVALUEPOOL_P_H
00021 #define AKONADI_SHAREDVALUEPOOL_P_H
00022 
00023 #include <boost/utility/enable_if.hpp>
00024 #include <algorithm>
00025 
00026 namespace Akonadi {
00027 namespace Internal {
00028 
00029 /*template <typename T> class container_traits
00030 {
00031   private:
00032     typedef char sizeOne;
00033     typedef struct { char a[2]; } sizeTwo;
00034     template <typename C> static sizeOne testForKeyType( typename C::key_type const* );
00035     template <typename C> static sizeTwo testForKeyType( ... );
00036   public:
00037     enum { isAssociative = sizeof( container_traits<T>::testForKeyType<T>( 0 ) ) == 1 };
00038 };*/
00039 
00044 template <typename T, template <typename> class Container>
00045 class SharedValuePool
00046 {
00047   public:
00049     /*template <typename C> 
00050     typename boost::enable_if_c<container_traits<Container<C> >::isAssociative, C>::type sharedValue( const C &value, const int* = 0 )
00051     {
00052       typename Container<T>::const_iterator it = m_pool.constFind( value );
00053       if ( it != m_pool.constEnd() )
00054         return *it;
00055       m_pool.insert( value );
00056       return value;
00057     }
00058 
00059     template <typename C>
00060     typename boost::disable_if_c<container_traits<Container<C> >::isAssociative, C>::type sharedValue( const C &value )*/
00061     T sharedValue( const T &value )
00062     {
00063       // for small pool sizes this is actually faster than using lower_bound and a sorted vector
00064       typename Container<T>::const_iterator it = std::find( m_pool.constBegin(), m_pool.constEnd(), value );
00065       if ( it != m_pool.constEnd() )
00066         return *it;
00067       m_pool.push_back( value );
00068       return value;
00069     }
00070 
00071   private:
00072     Container<T> m_pool;
00073 };
00074 
00075 }
00076 }
00077 
00078 #endif
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