/usr/include/liblas/iterator.hpp is in liblas-dev 1.2.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* $Id$
*
* Project: libLAS - http://liblas.org - A BSD library for LAS format data.
* Purpose: Reader and writer iterator implementation
* Author: Mateusz Loskot, mateusz@loskot.net
*
******************************************************************************
* Copyright (c) 2008, Mateusz Loskot
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the Martin Isenburg or Iowa Department
* of Natural Resources nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
****************************************************************************/
#ifndef LIBLAS_ITERATOR_HPP_INCLUDED
#define LIBLAS_ITERATOR_HPP_INCLUDED
#include <liblas/lasreader.hpp>
#include <liblas/laswriter.hpp>
#include <iterator>
#include <cassert>
#include <cstddef>
namespace liblas {
/// Input iterator associated with liblas::LASReader.
/// It allows to read LAS file records in similar way to elements of STL container,
/// as well as apply STL algorithms that accept pair of input iterators.
/// \sa About Input Iterator at http://www.sgi.com/tech/stl/InputIterator.html
///
template <typename T>
class reader_iterator
{
public:
typedef std::input_iterator_tag iterator_category;
typedef T value_type;
typedef T const* pointer;
typedef T const& reference;
typedef std::ptrdiff_t difference_type;
/// Initializes iterator pointing to pass-the-end.
reader_iterator()
: m_reader(0)
{}
/// Initializes iterator pointing to beginning of LAS file sequence.
/// No ownership transfer of reader object occurs.
reader_iterator(liblas::LASReader& reader)
: m_reader(&reader)
{
assert(0 != m_reader);
getval();
}
/// Dereference operator.
/// It is implemented in terms of LASReader::GetPoint function.
reference operator*() const
{
assert(0 != m_reader);
return m_reader->GetPoint();
}
/// Pointer-to-member operator.
/// It is implemented in terms of LASReader::GetPoint function.
pointer operator->() const
{
return &(operator*());
}
/// Pre-increment opertor.
/// Moves iterator to next record by calling LASReader::ReadNextPoint.
reader_iterator& operator++()
{
assert(0 != m_reader);
getval();
return (*this);
}
/// Post-increment opertor.
/// Moves iterator to next record by calling LASReader::ReadNextPoint.
reader_iterator operator++(int)
{
reader_iterator tmp(*this);
++(*this);
return tmp;
}
/// Compare passed iterator to this.
/// Determine if both iterators apply to the same instance of LASReader class.
bool equal(reader_iterator const& rhs) const
{
return m_reader == rhs.m_reader;
}
private:
void getval()
{
if (0 != m_reader && !(m_reader->ReadNextPoint()))
{
m_reader = 0;
}
}
liblas::LASReader* m_reader;
};
/// Equality operator implemented in terms of reader_iterator::equal
template <typename T>
bool operator==(reader_iterator<T> const& lhs, reader_iterator<T> const& rhs)
{
return lhs.equal(rhs);
}
/// Inequality operator implemented in terms of reader_iterator::equal
template <typename T>
bool operator!=(reader_iterator<T> const& lhs, reader_iterator<T> const& rhs)
{
return (!(lhs == rhs));
}
/// Output iterator associated with liblas::LASWriter.
/// It allows to store a sequence of records into LAS file.
/// \sa About Output Iterator at http://www.sgi.com/tech/stl/OutputIterator.html
///
template <typename T>
class writer_iterator
{
public:
typedef std::output_iterator_tag iterator_category;
typedef void value_type;
typedef void pointer;
typedef T const& reference;
typedef void difference_type;
/// Initialize iterator with given writer.
/// The writer position is not changed.
/// No ownership transfer of writer object occurs.
writer_iterator(liblas::LASWriter& writer)
: m_writer(&writer)
{
assert(0 != m_writer);
}
/// Dereference assignment operator.
/// Implemented in terms of LASWriter::WritePoint function.
writer_iterator& operator=(reference value)
{
assert(0 != m_writer);
bool const ret = m_writer->WritePoint(value);
assert(ret); // TODO: Low-level debugging
return (*this);
}
/// Dereference operator.
writer_iterator& operator*()
{
// pretend to return designated value
return (*this);
}
/// Pre-increment operator.
writer_iterator& operator++()
{
// pretend to preincrement
return (*this);
}
/// Post-increment operator.
writer_iterator operator++(int)
{
// pretend to postincrement
return (*this);
}
private:
liblas::LASWriter* m_writer;
};
// Declare specializations for user's convenience
/// Public specialization of LASReader input iterator for liblas::LASPoint type.
typedef reader_iterator<LASPoint> lasreader_iterator;
/// Public specialization of LASWriter output iterator for liblas::LASPoint type.
typedef writer_iterator<LASPoint> laswriter_iterator;
} // namespace liblas
#endif // LIBLAS_ITERATOR_HPP_INCLUDED
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