/usr/include/boost/iostreams/filter/counter.hpp is in libboost1.55-dev 1.55.0+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// (C) Copyright 2005-2007 Jonathan Turkanis
// 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/iostreams for documentation.
#ifndef BOOST_IOSTREAMS_COUNTER_HPP_INCLUDED
#define BOOST_IOSTREAMS_COUNTER_HPP_INCLUDED
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <algorithm> // count.
#include <boost/iostreams/categories.hpp>
#include <boost/iostreams/char_traits.hpp>
#include <boost/iostreams/operations.hpp>
#include <boost/iostreams/pipeline.hpp>
// Must come last.
#include <boost/iostreams/detail/config/disable_warnings.hpp> // VC7.1 C4244.
namespace boost { namespace iostreams {
//
// Template name: basic_counter.
// Template parameters:
// Ch - The character type.
// Description: Filter which counts lines and characters.
//
template<typename Ch>
class basic_counter {
public:
typedef Ch char_type;
struct category
: dual_use,
filter_tag,
multichar_tag,
optimally_buffered_tag
{ };
explicit basic_counter(int first_line = 0, int first_char = 0)
: lines_(first_line), chars_(first_char)
{ }
int lines() const { return lines_; }
int characters() const { return chars_; }
std::streamsize optimal_buffer_size() const { return 0; }
template<typename Source>
std::streamsize read(Source& src, char_type* s, std::streamsize n)
{
std::streamsize result = iostreams::read(src, s, n);
if (result == -1)
return -1;
lines_ += std::count(s, s + result, char_traits<Ch>::newline());
chars_ += result;
return result;
}
template<typename Sink>
std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
{
std::streamsize result = iostreams::write(snk, s, n);
lines_ += std::count(s, s + result, char_traits<Ch>::newline());
chars_ += result;
return result;
}
private:
int lines_;
int chars_;
};
BOOST_IOSTREAMS_PIPABLE(basic_counter, 1)
typedef basic_counter<char> counter;
typedef basic_counter<wchar_t> wcounter;
} } // End namespaces iostreams, boost.
#include <boost/iostreams/detail/config/enable_warnings.hpp>
#endif // #ifndef BOOST_IOSTREAMS_COUNTER_HPP_INCLUDED
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