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119 lines
3.3 KiB
119 lines
3.3 KiB
#ifndef LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_
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#define LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_
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/* This file is part of indexlib.
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* Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
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*
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* Indexlib is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation and available as file
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* GPL_V2 which is distributed along with indexlib.
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*
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* Indexlib is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of this program with any edition of
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* the TQt library by Trolltech AS, Norway (or with modified versions
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* of TQt that use the same license as TQt), and distribute linked
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* combinations including the two. You must obey the GNU General
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* Public License in all respects for all of the code used other than
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* TQt. If you modify this file, you may extend this exception to
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* your version of the file, but you are not obligated to do so. If
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* you do not wish to do so, delete this exception statement from
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* your version.
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*/
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#include "bitio.h"
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/**
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* Works like a reference to a memory location
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* which is written and read in our byte-format.
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*/
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template <typename T>
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struct memory_reference {
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public:
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explicit memory_reference( unsigned char* d ):
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data_( d )
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{
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}
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~memory_reference() { }
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memory_reference& operator = ( const memory_reference& other ) {
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operator=( T( other ) );
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return *this;
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}
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memory_reference& operator = ( const T& value ) {
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byte_io::write<T>( data_, value );
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return *this;
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}
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operator T () const {
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return byte_io::read<T>( data_ );
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}
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memory_reference( const memory_reference& other ):
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data_( other.data_ )
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{
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}
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/**
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* This is a sneaky method to change pointers
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*/
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void assign( const memory_reference& other ) {
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data_ = other.data_;
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}
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private:
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unsigned char* data_;
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};
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// A mixed and fairly random collection of helper functions
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template <typename T, typename U>
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memory_reference<T> operator += ( memory_reference<T> ref, U v ) {
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return ref = ref + v;
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}
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template <typename T>
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memory_reference<T> operator ++( memory_reference<T> ref ) {
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return ref = ref + 1;
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}
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template <typename T>
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memory_reference<T> operator --( memory_reference<T> ref ) {
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return ref = ref - 1;
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}
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template <typename T>
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T operator ++( memory_reference<T> ref, int ) {
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T v = ref;
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ref = ref + 1;
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return v;
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}
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template <typename T>
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T operator --( memory_reference<T> ref, int ) {
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T v = ref;
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ref = ref - 1;
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return v;
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}
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template <typename T, typename U>
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memory_reference<T> operator -= ( memory_reference<T> ref, U v ) {
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return ref = ref - v;
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}
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template <typename T, typename U>
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memory_reference<T> operator *= ( memory_reference<T> ref, U v ) {
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return ref = ref * v;
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}
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#endif /* LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_ */
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