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#ifndef LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_
#define LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_
/* This file is part of indexlib.
* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
*
* Indexlib is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation and available as file
* GPL_V2 which is distributed along with indexlib.
*
* Indexlib 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of this program with any edition of
* the Qt library by Trolltech AS, Norway (or with modified versions
* of Qt that use the same license as Qt), and distribute linked
* combinations including the two. You must obey the GNU General
* Public License in all respects for all of the code used other than
* Qt. If you modify this file, you may extend this exception to
* your version of the file, but you are not obligated to do so. If
* you do not wish to do so, delete this exception statement from
* your version.
*/
#include "bitio.h"
/**
* Works like a reference to a memory location
* which is written and read in our byte-format.
*/
template <typename T>
struct memory_reference {
public:
explicit memory_reference( unsigned char* d ):
data_( d )
{
}
~memory_reference() { }
memory_reference& operator = ( const memory_reference& other ) {
operator=( T( other ) );
return *this;
}
memory_reference& operator = ( const T& value ) {
byte_io::write<T>( data_, value );
return *this;
}
operator T () const {
return byte_io::read<T>( data_ );
}
memory_reference( const memory_reference& other ):
data_( other.data_ )
{
}
/**
* This is a sneaky method to change pointers
*/
void assign( const memory_reference& other ) {
data_ = other.data_;
}
private:
unsigned char* data_;
};
// A mixed and fairly random collection of helper functions
template <typename T, typename U>
memory_reference<T> operator += ( memory_reference<T> ref, U v ) {
return ref = ref + v;
}
template <typename T>
memory_reference<T> operator ++( memory_reference<T> ref ) {
return ref = ref + 1;
}
template <typename T>
memory_reference<T> operator --( memory_reference<T> ref ) {
return ref = ref - 1;
}
template <typename T>
T operator ++( memory_reference<T> ref, int ) {
T v = ref;
ref = ref + 1;
return v;
}
template <typename T>
T operator --( memory_reference<T> ref, int ) {
T v = ref;
ref = ref - 1;
return v;
}
template <typename T, typename U>
memory_reference<T> operator -= ( memory_reference<T> ref, U v ) {
return ref = ref - v;
}
template <typename T, typename U>
memory_reference<T> operator *= ( memory_reference<T> ref, U v ) {
return ref = ref * v;
}
#endif /* LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_ */
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