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#ifndef LPC_MEMVECTOR_H1105049836_INCLUDE_GUARD_
#define LPC_MEMVECTOR_H1105049836_INCLUDE_GUARD_
/* This file is part of indexlib.
* Copyright (C) 2005 Luís Pedro Coelho <[email protected]>
*
* 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 TQt library by Trolltech AS, Norway (or with modified versions
* of TQt that use the same license as TQt), 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
* TQt. 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 "memreference.h"
#include "bitio.h"
#include "compat.h"
#include "manager.h"
#include "boost-compat/static_assert.hpp"
#include "boost-compat/scoped_ptr.hpp"
#ifdef HAVE_BOOST
#include <boost/type_traits/is_convertible.hpp>
#endif
#include <iostream>
#include <iterator>
#include <string>
#include <cstddef>
#include <cstring>
#include <assert.h>
template <typename> class memory_iterator;
template <typename> class memvector;
template <typename T>
struct memory_iterator : public std::iterator<STD_NAMESPACE_PREFIX random_access_iterator_tag,T> {
private:
public:
template <typename U>
memory_iterator( const memory_iterator<U>& other ):
data_( const_cast<unsigned char*>( other.raw() ) )
{
BOOST_STATIC_ASSERT( (boost::is_convertible<U, T>::value ) );
}
explicit memory_iterator( unsigned char* d ):
data_( d )
{
}
T operator* () const {
return byte_io::read<T>( data_ );
}
memory_reference<T> operator* () {
return memory_reference<T>( data_ );
}
memory_iterator& operator ++() {
data_ += byte_io::byte_length<T>();
return *this;
}
memory_iterator& operator --() {
data_ -= byte_io::byte_length<T>();
return *this;
}
memory_iterator& operator += ( ptrdiff_t dif ) {
data_ += dif * byte_io::byte_length<T>();
return *this;
}
ptrdiff_t operator - ( const memory_iterator<T>& other ) const {
assert( !( ( raw() - other.raw() )%byte_io::byte_length<T>() ) );
return ( raw() - other.raw() )/byte_io::byte_length<T>();
}
bool operator < ( const memory_iterator<T>& other ) const {
return ( this->raw() - other.raw() ) < 0;
}
const unsigned char* raw() const { return data_; }
private:
unsigned char* data_;
};
template <typename T, typename U>
inline
bool operator == ( const memory_iterator<T>& a, const memory_iterator<U>& b ) {
return a.raw() == b.raw();
}
template <typename T, typename U>
inline
bool operator != ( const memory_iterator<T>& a, const memory_iterator<U>& b ) {
return !( a == b );
}
template <typename T, typename U>
inline
bool operator <= ( const memory_iterator<T>& a, const memory_iterator<U>& b ) {
return !( b < a );
}
template <typename T>
inline
memory_iterator<T> operator + ( memory_iterator<T> iter, typename memory_iterator<T>::difference_type dif ) {
iter += dif;
return iter;
}
template <typename T>
inline
memory_iterator<T>& operator -= ( memory_iterator<T>& iter, typename memory_iterator<T>::difference_type dif ) {
iter += -dif;
return iter;
}
template <typename T>
inline
memory_iterator<T> operator - ( memory_iterator<T> iter, typename memory_iterator<T>::difference_type dif ) {
iter -= dif;
return iter;
}
template <typename T>
inline
memory_iterator<T> operator -- ( memory_iterator<T>& ref, int ) {
memory_iterator<T> copy = ref;
--ref;
return copy;
}
template<typename T>
inline
memory_iterator<T> operator ++ ( memory_iterator<T>& ref, int ) {
memory_iterator<T> copy = ref;
++ref;
return copy;
}
/**
* A vector of T kept on disk.
*
* The interface is a subset of std::vector<T>'s interface.
*/
template <typename T>
struct memvector {
public:
memvector( std::string );
~memvector();
typedef T value_type;
typedef unsigned size_type;
typedef memory_iterator<T> iterator;
typedef memory_iterator<const T> const_iterator;
iterator begin() { return iterator( address_of( 0 ) ); }
iterator end() { return iterator( address_of( size() ) ); }
const_iterator begin() const { return const_iterator( address_of( 0 ) ); }
const_iterator end() const { return const_iterator( address_of( size() ) ); }
value_type operator[] ( unsigned idx ) const {
assert( idx < size() );
return byte_io::read<T>( address_of( idx ) );
}
memory_reference<T> operator[] ( unsigned idx ) {
assert( idx < size() );
return memory_reference<T>( address_of( idx ) );
}
/**
* For debugging, nothing else
*/
void print( std::ostream& ) const;
size_type size() const { return byte_io::read<uint32_t>( data_->ronly_base( 0 ) ); }
bool empty() const { return !size(); }
void resize( size_type );
void insert( const_iterator, const value_type );
void erase( iterator );
void clear();
void push_back( value_type v ) { insert( end(), v ); }
/**
* Removes from disk
*/
static void remove( std::string );
private:
boost::scoped_ptr<memory_manager> data_;
unsigned char* address_of( unsigned i ) {
return data_->rw_base(
byte_io::byte_length<unsigned>() +
i * byte_io::byte_length<T>() );
}
const unsigned char* address_of( unsigned i ) const {
return const_cast<memvector*>( this )->address_of( i );
}
};
#include "memvector.tcc"
#endif /* LPC_MEMVECTOR_H1105049836_INCLUDE_GUARD_ */
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