/*============================================================================= | |
Copyright (c) 2001-2011 Hartmut Kaiser | |
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) | |
==============================================================================*/ | |
#if !defined(BOOST_SPIRIT_ITERATOR_ISTREAM_MAY_05_2007_0110PM) | |
#define BOOST_SPIRIT_ITERATOR_ISTREAM_MAY_05_2007_0110PM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/iostreams/stream.hpp> | |
#include <boost/detail/iterator.hpp> | |
/////////////////////////////////////////////////////////////////////////////// | |
namespace boost { namespace spirit { namespace qi { namespace detail | |
{ | |
/////////////////////////////////////////////////////////////////////////// | |
template <typename Iterator> | |
struct iterator_source | |
{ | |
typedef typename | |
boost::detail::iterator_traits<Iterator>::value_type | |
char_type; | |
typedef boost::iostreams::source_tag category; | |
iterator_source (Iterator& first_, Iterator const& last_) | |
: first(first_), last(last_) | |
{} | |
// Read up to n characters from the input sequence into the buffer s, | |
// returning the number of characters read, or -1 to indicate | |
// end-of-sequence. | |
std::streamsize read (char_type* s, std::streamsize n) | |
{ | |
if (first == last) | |
return -1; | |
std::streamsize bytes_read = 0; | |
while (n--) { | |
*s = *first; | |
++s; ++bytes_read; | |
if (++first == last) | |
break; | |
} | |
return bytes_read; | |
} | |
Iterator& first; | |
Iterator const& last; | |
private: | |
// silence MSVC warning C4512: assignment operator could not be generated | |
iterator_source& operator= (iterator_source const&); | |
}; | |
}}}} | |
#endif |