/usr/include/boost/interprocess/streams/vectorstream.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
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//
// (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/interprocess for documentation.
//
//////////////////////////////////////////////////////////////////////////////
//
// This file comes from SGI's sstream file. Modified by Ion Gaztanaga 2005-2012.
// Changed internal SGI string to a generic, templatized vector. Added efficient
// internal buffer get/set/swap functions, so that we can obtain/establish the
// internal buffer without any reallocation or copy. Kill those temporaries!
///////////////////////////////////////////////////////////////////////////////
/*
* Copyright (c) 1998
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
//!\file
//!This file defines basic_vectorbuf, basic_ivectorstream,
//!basic_ovectorstream, and basic_vectorstreamclasses. These classes
//!represent streamsbufs and streams whose sources or destinations are
//!STL-like vectors that can be swapped with external vectors to avoid
//!unnecessary allocations/copies.
#ifndef BOOST_INTERPROCESS_VECTORSTREAM_HPP
#define BOOST_INTERPROCESS_VECTORSTREAM_HPP
#include <boost/interprocess/detail/config_begin.hpp>
#include <boost/interprocess/detail/workaround.hpp>
#include <iosfwd>
#include <ios>
#include <istream>
#include <ostream>
#include <string> // char traits
#include <cstddef> // ptrdiff_t
#include <boost/interprocess/interprocess_fwd.hpp>
#include <boost/assert.hpp>
namespace boost { namespace interprocess {
//!A streambuf class that controls the transmission of elements to and from
//!a basic_ivectorstream, basic_ovectorstream or basic_vectorstream.
//!It holds a character vector specified by CharVector template parameter
//!as its formatting buffer. The vector must have contiguous storage, like
//!std::vector, boost::interprocess::vector or boost::interprocess::basic_string
template <class CharVector, class CharTraits>
class basic_vectorbuf
: public std::basic_streambuf<typename CharVector::value_type, CharTraits>
{
public:
typedef CharVector vector_type;
typedef typename CharVector::value_type char_type;
typedef typename CharTraits::int_type int_type;
typedef typename CharTraits::pos_type pos_type;
typedef typename CharTraits::off_type off_type;
typedef CharTraits traits_type;
/// @cond
private:
typedef std::basic_streambuf<char_type, traits_type> base_t;
basic_vectorbuf(const basic_vectorbuf&);
basic_vectorbuf & operator =(const basic_vectorbuf&);
/// @endcond
public:
//!Constructor. Throws if vector_type default
//!constructor throws.
explicit basic_vectorbuf(std::ios_base::openmode mode
= std::ios_base::in | std::ios_base::out)
: base_t(), m_mode(mode)
{ this->initialize_pointers(); }
//!Constructor. Throws if
//!vector_type(const VectorParameter ¶m) throws.
template<class VectorParameter>
explicit basic_vectorbuf(const VectorParameter ¶m,
std::ios_base::openmode mode
= std::ios_base::in | std::ios_base::out)
: base_t(), m_mode(mode), m_vect(param)
{ this->initialize_pointers(); }
public:
//!Swaps the underlying vector with the passed vector.
//!This function resets the read/write position in the stream.
//!Does not throw.
void swap_vector(vector_type &vect)
{
if (this->m_mode & std::ios_base::out){
//Update high water if necessary
//And resize vector to remove extra size
if (mp_high_water < base_t::pptr()){
//Restore the vector's size if necessary
mp_high_water = base_t::pptr();
}
//This does not reallocate
m_vect.resize(mp_high_water - (m_vect.size() ? &m_vect[0] : 0));
}
//Now swap vector
m_vect.swap(vect);
this->initialize_pointers();
}
//!Returns a const reference to the internal vector.
//!Does not throw.
const vector_type &vector() const
{
if (this->m_mode & std::ios_base::out){
if (mp_high_water < base_t::pptr()){
//Restore the vector's size if necessary
mp_high_water = base_t::pptr();
}
//This shouldn't reallocate
typedef typename vector_type::size_type size_type;
char_type *old_ptr = base_t::pbase();
size_type high_pos = size_type(mp_high_water-old_ptr);
if(m_vect.size() > high_pos){
m_vect.resize(high_pos);
//But we must update end write pointer because vector size is now shorter
int old_pos = base_t::pptr() - base_t::pbase();
const_cast<basic_vectorbuf*>(this)->base_t::setp(old_ptr, old_ptr + high_pos);
const_cast<basic_vectorbuf*>(this)->base_t::pbump(old_pos);
}
}
return m_vect;
}
//!Preallocates memory from the internal vector.
//!Resets the stream to the first position.
//!Throws if the internals vector's memory allocation throws.
void reserve(typename vector_type::size_type size)
{
if (this->m_mode & std::ios_base::out && size > m_vect.size()){
typename vector_type::difference_type write_pos = base_t::pptr() - base_t::pbase();
typename vector_type::difference_type read_pos = base_t::gptr() - base_t::eback();
//Now update pointer data
m_vect.reserve(size);
this->initialize_pointers();
base_t::pbump((int)write_pos);
if(this->m_mode & std::ios_base::in){
base_t::gbump((int)read_pos);
}
}
}
//!Calls clear() method of the internal vector.
//!Resets the stream to the first position.
void clear()
{ m_vect.clear(); this->initialize_pointers(); }
/// @cond
private:
//Maximizes high watermark to the initial vector size,
//initializes read and write iostream buffers to the capacity
//and resets stream positions
void initialize_pointers()
{
// The initial read position is the beginning of the vector.
if(!(m_mode & std::ios_base::out)){
if(m_vect.empty()){
this->setg(0, 0, 0);
}
else{
this->setg(&m_vect[0], &m_vect[0], &m_vect[0] + m_vect.size());
}
}
// The initial write position is the beginning of the vector.
if(m_mode & std::ios_base::out){
//First get real size
int real_size = (int)m_vect.size();
//Then maximize size for high watermarking
m_vect.resize(m_vect.capacity());
BOOST_ASSERT(m_vect.size() == m_vect.capacity());
//Set high watermarking with the expanded size
mp_high_water = m_vect.size() ? (&m_vect[0] + real_size) : 0;
//Now set formatting pointers
if(m_vect.empty()){
this->setp(0, 0);
if(m_mode & std::ios_base::in)
this->setg(0, 0, 0);
}
else{
char_type *p = &m_vect[0];
this->setp(p, p + m_vect.size());
if(m_mode & std::ios_base::in)
this->setg(p, p, p + real_size);
}
if (m_mode & (std::ios_base::app | std::ios_base::ate)){
base_t::pbump((int)real_size);
}
}
}
protected:
virtual int_type underflow()
{
if (base_t::gptr() == 0)
return CharTraits::eof();
if(m_mode & std::ios_base::out){
if (mp_high_water < base_t::pptr())
mp_high_water = base_t::pptr();
if (base_t::egptr() < mp_high_water)
base_t::setg(base_t::eback(), base_t::gptr(), mp_high_water);
}
if (base_t::gptr() < base_t::egptr())
return CharTraits::to_int_type(*base_t::gptr());
return CharTraits::eof();
}
virtual int_type pbackfail(int_type c = CharTraits::eof())
{
if(this->gptr() != this->eback()) {
if(!CharTraits::eq_int_type(c, CharTraits::eof())) {
if(CharTraits::eq(CharTraits::to_char_type(c), this->gptr()[-1])) {
this->gbump(-1);
return c;
}
else if(m_mode & std::ios_base::out) {
this->gbump(-1);
*this->gptr() = c;
return c;
}
else
return CharTraits::eof();
}
else {
this->gbump(-1);
return CharTraits::not_eof(c);
}
}
else
return CharTraits::eof();
}
virtual int_type overflow(int_type c = CharTraits::eof())
{
if(m_mode & std::ios_base::out) {
if(!CharTraits::eq_int_type(c, CharTraits::eof())) {
typedef typename vector_type::difference_type dif_t;
//The new output position is the previous one plus one
//because 'overflow' requires putting 'c' on the buffer
dif_t new_outpos = base_t::pptr() - base_t::pbase() + 1;
//Adjust high water if necessary
dif_t hipos = mp_high_water - base_t::pbase();
if (hipos < new_outpos)
hipos = new_outpos;
//Insert the new data
m_vect.push_back(CharTraits::to_char_type(c));
m_vect.resize(m_vect.capacity());
BOOST_ASSERT(m_vect.size() == m_vect.capacity());
char_type* p = const_cast<char_type*>(&m_vect[0]);
//A reallocation might have happened, update pointers
base_t::setp(p, p + (dif_t)m_vect.size());
mp_high_water = p + hipos;
if (m_mode & std::ios_base::in)
base_t::setg(p, p + (base_t::gptr() - base_t::eback()), mp_high_water);
//Update write position to the old position + 1
base_t::pbump((int)new_outpos);
return c;
}
else // c is EOF, so we don't have to do anything
return CharTraits::not_eof(c);
}
else // Overflow always fails if it's read-only.
return CharTraits::eof();
}
virtual pos_type seekoff(off_type off, std::ios_base::seekdir dir,
std::ios_base::openmode mode
= std::ios_base::in | std::ios_base::out)
{
//Get seek mode
bool in(0 != (mode & std::ios_base::in)), out(0 != (mode & std::ios_base::out));
//Test for logic errors
if(!in & !out)
return pos_type(off_type(-1));
else if((in && out) && (dir == std::ios_base::cur))
return pos_type(off_type(-1));
else if((in && (!(m_mode & std::ios_base::in) || this->gptr() == 0)) ||
(out && (!(m_mode & std::ios_base::out) || this->pptr() == 0)))
return pos_type(off_type(-1));
off_type newoff;
//Just calculate the end of the stream. If the stream is read-only
//the limit is the size of the vector. Otherwise, the high water mark
//will mark the real size.
off_type limit;
if(m_mode & std::ios_base::out){
//Update high water marking because pptr() is going to change and it might
//have been updated since last overflow()
if(mp_high_water < base_t::pptr())
mp_high_water = base_t::pptr();
//Update read limits in case high water mark was changed
if(m_mode & std::ios_base::in){
if (base_t::egptr() < mp_high_water)
base_t::setg(base_t::eback(), base_t::gptr(), mp_high_water);
}
limit = static_cast<off_type>(mp_high_water - base_t::pbase());
}
else{
limit = static_cast<off_type>(m_vect.size());
}
switch(dir) {
case std::ios_base::beg:
newoff = 0;
break;
case std::ios_base::end:
newoff = limit;
break;
case std::ios_base::cur:
newoff = in ? static_cast<std::streamoff>(this->gptr() - this->eback())
: static_cast<std::streamoff>(this->pptr() - this->pbase());
break;
default:
return pos_type(off_type(-1));
}
newoff += off;
if (newoff < 0 || newoff > limit)
return pos_type(-1);
if (m_mode & std::ios_base::app && mode & std::ios_base::out && newoff != limit)
return pos_type(-1);
//This can reassign pointers
//if(m_vect.size() != m_vect.capacity())
//this->initialize_pointers();
if (in)
base_t::setg(base_t::eback(), base_t::eback() + newoff, base_t::egptr());
if (out){
base_t::setp(base_t::pbase(), base_t::epptr());
base_t::pbump(newoff);
}
return pos_type(newoff);
}
virtual pos_type seekpos(pos_type pos, std::ios_base::openmode mode
= std::ios_base::in | std::ios_base::out)
{ return seekoff(pos - pos_type(off_type(0)), std::ios_base::beg, mode); }
private:
std::ios_base::openmode m_mode;
mutable vector_type m_vect;
mutable char_type* mp_high_water;
/// @endcond
};
//!A basic_istream class that holds a character vector specified by CharVector
//!template parameter as its formatting buffer. The vector must have
//!contiguous storage, like std::vector, boost::interprocess::vector or
//!boost::interprocess::basic_string
template <class CharVector, class CharTraits>
class basic_ivectorstream
: public std::basic_istream<typename CharVector::value_type, CharTraits>
/// @cond
, private basic_vectorbuf<CharVector, CharTraits>
/// @endcond
{
public:
typedef CharVector vector_type;
typedef typename std::basic_ios
<typename CharVector::value_type, CharTraits>::char_type char_type;
typedef typename std::basic_ios<char_type, CharTraits>::int_type int_type;
typedef typename std::basic_ios<char_type, CharTraits>::pos_type pos_type;
typedef typename std::basic_ios<char_type, CharTraits>::off_type off_type;
typedef typename std::basic_ios<char_type, CharTraits>::traits_type traits_type;
/// @cond
private:
typedef basic_vectorbuf<CharVector, CharTraits> vectorbuf_t;
typedef std::basic_ios<char_type, CharTraits> basic_ios_t;
typedef std::basic_istream<char_type, CharTraits> base_t;
vectorbuf_t & get_buf() { return *this; }
const vectorbuf_t & get_buf() const{ return *this; }
/// @endcond
public:
//!Constructor. Throws if vector_type default
//!constructor throws.
basic_ivectorstream(std::ios_base::openmode mode = std::ios_base::in)
: base_t(0) //Initializes first the base class to safely init the virtual basic_ios base
//(via basic_ios::init() call in base_t's constructor) without the risk of a
//previous throwing vectorbuf constructor. Set the streambuf after risk has gone.
, vectorbuf_t(mode | std::ios_base::in)
{ this->base_t::rdbuf(&get_buf()); }
//!Constructor. Throws if vector_type(const VectorParameter ¶m)
//!throws.
template<class VectorParameter>
basic_ivectorstream(const VectorParameter ¶m,
std::ios_base::openmode mode = std::ios_base::in)
: vectorbuf_t(param, mode | std::ios_base::in)
//basic_ios_t() is constructed uninitialized as virtual base
//and initialized inside base_t calling basic_ios::init()
, base_t(&get_buf())
{}
public:
//!Returns the address of the stored
//!stream buffer.
basic_vectorbuf<CharVector, CharTraits>* rdbuf() const
{ return const_cast<basic_vectorbuf<CharVector, CharTraits>*>(&get_buf()); }
//!Swaps the underlying vector with the passed vector.
//!This function resets the read position in the stream.
//!Does not throw.
void swap_vector(vector_type &vect)
{ get_buf().swap_vector(vect); }
//!Returns a const reference to the internal vector.
//!Does not throw.
const vector_type &vector() const
{ return get_buf().vector(); }
//!Calls reserve() method of the internal vector.
//!Resets the stream to the first position.
//!Throws if the internals vector's reserve throws.
void reserve(typename vector_type::size_type size)
{ get_buf().reserve(size); }
//!Calls clear() method of the internal vector.
//!Resets the stream to the first position.
void clear()
{ get_buf().clear(); }
};
//!A basic_ostream class that holds a character vector specified by CharVector
//!template parameter as its formatting buffer. The vector must have
//!contiguous storage, like std::vector, boost::interprocess::vector or
//!boost::interprocess::basic_string
template <class CharVector, class CharTraits>
class basic_ovectorstream
: public std::basic_ostream<typename CharVector::value_type, CharTraits>
/// @cond
, private basic_vectorbuf<CharVector, CharTraits>
/// @endcond
{
public:
typedef CharVector vector_type;
typedef typename std::basic_ios
<typename CharVector::value_type, CharTraits>::char_type char_type;
typedef typename std::basic_ios<char_type, CharTraits>::int_type int_type;
typedef typename std::basic_ios<char_type, CharTraits>::pos_type pos_type;
typedef typename std::basic_ios<char_type, CharTraits>::off_type off_type;
typedef typename std::basic_ios<char_type, CharTraits>::traits_type traits_type;
/// @cond
private:
typedef basic_vectorbuf<CharVector, CharTraits> vectorbuf_t;
typedef std::basic_ios<char_type, CharTraits> basic_ios_t;
typedef std::basic_ostream<char_type, CharTraits> base_t;
vectorbuf_t & get_buf() { return *this; }
const vectorbuf_t & get_buf()const { return *this; }
/// @endcond
public:
//!Constructor. Throws if vector_type default
//!constructor throws.
basic_ovectorstream(std::ios_base::openmode mode = std::ios_base::out)
: base_t(0) //Initializes first the base class to safely init the virtual basic_ios base
//(via basic_ios::init() call in base_t's constructor) without the risk of a
//previous throwing vectorbuf constructor. Set the streambuf after risk has gone.
, vectorbuf_t(mode | std::ios_base::out)
{ this->base_t::rdbuf(&get_buf()); }
//!Constructor. Throws if vector_type(const VectorParameter ¶m)
//!throws.
template<class VectorParameter>
basic_ovectorstream(const VectorParameter ¶m,
std::ios_base::openmode mode = std::ios_base::out)
: base_t(0) //Initializes first the base class to safely init the virtual basic_ios base
//(via basic_ios::init() call in base_t's constructor) without the risk of a
//previous throwing vectorbuf constructor. Set the streambuf after risk has gone.
, vectorbuf_t(param, mode | std::ios_base::out)
{ this->base_t::rdbuf(&get_buf()); }
public:
//!Returns the address of the stored
//!stream buffer.
basic_vectorbuf<CharVector, CharTraits>* rdbuf() const
{ return const_cast<basic_vectorbuf<CharVector, CharTraits>*>(&get_buf()); }
//!Swaps the underlying vector with the passed vector.
//!This function resets the write position in the stream.
//!Does not throw.
void swap_vector(vector_type &vect)
{ get_buf().swap_vector(vect); }
//!Returns a const reference to the internal vector.
//!Does not throw.
const vector_type &vector() const
{ return get_buf().vector(); }
//!Calls reserve() method of the internal vector.
//!Resets the stream to the first position.
//!Throws if the internals vector's reserve throws.
void reserve(typename vector_type::size_type size)
{ get_buf().reserve(size); }
};
//!A basic_iostream class that holds a character vector specified by CharVector
//!template parameter as its formatting buffer. The vector must have
//!contiguous storage, like std::vector, boost::interprocess::vector or
//!boost::interprocess::basic_string
template <class CharVector, class CharTraits>
class basic_vectorstream
: public std::basic_iostream<typename CharVector::value_type, CharTraits>
/// @cond
, private basic_vectorbuf<CharVector, CharTraits>
/// @endcond
{
public:
typedef CharVector vector_type;
typedef typename std::basic_ios
<typename CharVector::value_type, CharTraits>::char_type char_type;
typedef typename std::basic_ios<char_type, CharTraits>::int_type int_type;
typedef typename std::basic_ios<char_type, CharTraits>::pos_type pos_type;
typedef typename std::basic_ios<char_type, CharTraits>::off_type off_type;
typedef typename std::basic_ios<char_type, CharTraits>::traits_type traits_type;
/// @cond
private:
typedef basic_vectorbuf<CharVector, CharTraits> vectorbuf_t;
typedef std::basic_ios<char_type, CharTraits> basic_ios_t;
typedef std::basic_iostream<char_type, CharTraits> base_t;
vectorbuf_t & get_buf() { return *this; }
const vectorbuf_t & get_buf() const{ return *this; }
/// @endcond
public:
//!Constructor. Throws if vector_type default
//!constructor throws.
basic_vectorstream(std::ios_base::openmode mode
= std::ios_base::in | std::ios_base::out)
: base_t(0) //Initializes first the base class to safely init the virtual basic_ios base
//(via basic_ios::init() call in base_t's constructor) without the risk of a
//previous throwing vectorbuf constructor. Set the streambuf after risk has gone.
, vectorbuf_t(mode)
{ this->base_t::rdbuf(&get_buf()); }
//!Constructor. Throws if vector_type(const VectorParameter ¶m)
//!throws.
template<class VectorParameter>
basic_vectorstream(const VectorParameter ¶m, std::ios_base::openmode mode
= std::ios_base::in | std::ios_base::out)
: base_t(0) //Initializes first the base class to safely init the virtual basic_ios base
//(via basic_ios::init() call in base_t's constructor) without the risk of a
//previous throwing vectorbuf constructor. Set the streambuf after risk has gone.
, vectorbuf_t(param, mode)
{ this->base_t::rdbuf(&get_buf()); }
public:
//Returns the address of the stored stream buffer.
basic_vectorbuf<CharVector, CharTraits>* rdbuf() const
{ return const_cast<basic_vectorbuf<CharVector, CharTraits>*>(&get_buf()); }
//!Swaps the underlying vector with the passed vector.
//!This function resets the read/write position in the stream.
//!Does not throw.
void swap_vector(vector_type &vect)
{ get_buf().swap_vector(vect); }
//!Returns a const reference to the internal vector.
//!Does not throw.
const vector_type &vector() const
{ return get_buf().vector(); }
//!Calls reserve() method of the internal vector.
//!Resets the stream to the first position.
//!Throws if the internals vector's reserve throws.
void reserve(typename vector_type::size_type size)
{ get_buf().reserve(size); }
//!Calls clear() method of the internal vector.
//!Resets the stream to the first position.
void clear()
{ get_buf().clear(); }
};
//Some typedefs to simplify usage
//!
//!typedef basic_vectorbuf<std::vector<char> > vectorbuf;
//!typedef basic_vectorstream<std::vector<char> > vectorstream;
//!typedef basic_ivectorstream<std::vector<char> > ivectorstream;
//!typedef basic_ovectorstream<std::vector<char> > ovectorstream;
//!
//!typedef basic_vectorbuf<std::vector<wchar_t> > wvectorbuf;
//!typedef basic_vectorstream<std::vector<wchar_t> > wvectorstream;
//!typedef basic_ivectorstream<std::vector<wchar_t> > wivectorstream;
//!typedef basic_ovectorstream<std::vector<wchar_t> > wovectorstream;
}} //namespace boost { namespace interprocess {
#include <boost/interprocess/detail/config_end.hpp>
#endif /* BOOST_INTERPROCESS_VECTORSTREAM_HPP */
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