You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
364 lines
12 KiB
364 lines
12 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
|
|
// (C) Copyright 2003-2007 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.
|
|
|
|
//
|
|
// Contains metafunctions char_type_of, category_of and mode_of used for
|
|
// deducing the i/o category and i/o mode of a model of Filter or Device.
|
|
//
|
|
// Also contains several utility metafunctions, functions and macros.
|
|
//
|
|
|
|
#ifndef BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED
|
|
#define BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED
|
|
|
|
#if defined(_MSC_VER)
|
|
# pragma once
|
|
#endif
|
|
|
|
#include <iosfwd> // stream types, char_traits.
|
|
#include <boost/config.hpp> // partial spec, deduced typename.
|
|
#include <boost/detail/workaround.hpp>
|
|
#include <boost/iostreams/categories.hpp>
|
|
#include <boost/iostreams/detail/bool_trait_def.hpp>
|
|
#include <boost/iostreams/detail/config/wide_streams.hpp>
|
|
#include <boost/iostreams/detail/is_iterator_range.hpp>
|
|
#include <boost/iostreams/detail/select.hpp>
|
|
#include <boost/iostreams/detail/select_by_size.hpp>
|
|
#include <boost/iostreams/detail/wrap_unwrap.hpp>
|
|
#include <boost/iostreams/traits_fwd.hpp>
|
|
#include <boost/mpl/bool.hpp>
|
|
#include <boost/mpl/eval_if.hpp>
|
|
#include <boost/mpl/identity.hpp>
|
|
#include <boost/mpl/int.hpp>
|
|
#include <boost/mpl/or.hpp>
|
|
#include <boost/range/iterator_range.hpp>
|
|
#include <boost/range/value_type.hpp>
|
|
#include <boost/ref.hpp>
|
|
#include <boost/type_traits/is_convertible.hpp>
|
|
|
|
// Must come last.
|
|
#include <boost/iostreams/detail/config/disable_warnings.hpp>
|
|
|
|
namespace boost { namespace iostreams {
|
|
|
|
//----------Definitions of predicates for streams and stream buffers----------//
|
|
|
|
#ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------------------//
|
|
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istream, std::basic_istream, 2)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostream, std::basic_ostream, 2)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_iostream, std::basic_iostream, 2)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_streambuf, std::basic_streambuf, 2)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ifstream, std::basic_ifstream, 2)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ofstream, std::basic_ofstream, 2)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_fstream, std::basic_fstream, 2)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_filebuf, std::basic_filebuf, 2)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istringstream, std::basic_istringstream, 3)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostringstream, std::basic_ostringstream, 3)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_stringstream, std::basic_stringstream, 3)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_stringbuf, std::basic_stringbuf, 3)
|
|
|
|
#else // #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-----------------------//
|
|
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_istream, std::istream, 0)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_ostream, std::ostream, 0)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_iostream, std::iostream, 0)
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_streambuf, std::streambuf, 0)
|
|
|
|
#endif // #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //----------------------//
|
|
|
|
template<typename T>
|
|
struct is_std_io
|
|
: mpl::or_< is_istream<T>, is_ostream<T>, is_streambuf<T> >
|
|
{ };
|
|
|
|
template<typename T>
|
|
struct is_std_file_device
|
|
: mpl::or_<
|
|
is_ifstream<T>,
|
|
is_ofstream<T>,
|
|
is_fstream<T>,
|
|
is_filebuf<T>
|
|
>
|
|
{ };
|
|
|
|
template<typename T>
|
|
struct is_std_string_device
|
|
: mpl::or_<
|
|
is_istringstream<T>,
|
|
is_ostringstream<T>,
|
|
is_stringstream<T>,
|
|
is_stringbuf<T>
|
|
>
|
|
{ };
|
|
|
|
template<typename Device, typename Tr, typename Alloc>
|
|
struct stream;
|
|
|
|
template<typename T, typename Tr, typename Alloc, typename Mode>
|
|
class stream_buffer;
|
|
|
|
template< typename Mode, typename Ch, typename Tr,
|
|
typename Alloc, typename Access >
|
|
class filtering_stream;
|
|
|
|
template< typename Mode, typename Ch, typename Tr,
|
|
typename Alloc, typename Access >
|
|
class wfiltering_stream;
|
|
|
|
template< typename Mode, typename Ch, typename Tr,
|
|
typename Alloc, typename Access >
|
|
class filtering_streambuf;
|
|
|
|
template< typename Mode, typename Ch, typename Tr,
|
|
typename Alloc, typename Access >
|
|
class filtering_wstreambuf;
|
|
|
|
namespace detail {
|
|
|
|
template<typename T, typename Tr>
|
|
class linked_streambuf;
|
|
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_boost_stream,
|
|
boost::iostreams::stream,
|
|
3 )
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_boost_stream_buffer,
|
|
boost::iostreams::stream_buffer,
|
|
4 )
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_stream_impl,
|
|
boost::iostreams::filtering_stream,
|
|
5 )
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_wstream_impl,
|
|
boost::iostreams::wfiltering_stream,
|
|
5 )
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_streambuf_impl,
|
|
boost::iostreams::filtering_streambuf,
|
|
5 )
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF( is_filtering_wstreambuf_impl,
|
|
boost::iostreams::filtering_wstreambuf,
|
|
5 )
|
|
BOOST_IOSTREAMS_BOOL_TRAIT_DEF(is_linked, linked_streambuf, 2)
|
|
|
|
template<typename T>
|
|
struct is_filtering_stream
|
|
: mpl::or_<
|
|
is_filtering_stream_impl<T>,
|
|
is_filtering_wstream_impl<T>
|
|
>
|
|
{ };
|
|
|
|
template<typename T>
|
|
struct is_filtering_streambuf
|
|
: mpl::or_<
|
|
is_filtering_streambuf_impl<T>,
|
|
is_filtering_wstreambuf_impl<T>
|
|
>
|
|
{ };
|
|
|
|
template<typename T>
|
|
struct is_boost
|
|
: mpl::or_<
|
|
is_boost_stream<T>,
|
|
is_boost_stream_buffer<T>,
|
|
is_filtering_stream<T>,
|
|
is_filtering_streambuf<T>
|
|
>
|
|
{ };
|
|
|
|
} // End namespace detail.
|
|
|
|
//------------------Definitions of char_type_of-------------------------------//
|
|
|
|
namespace detail {
|
|
|
|
template<typename T>
|
|
struct member_char_type { typedef typename T::char_type type; };
|
|
|
|
} // End namespace detail.
|
|
|
|
# ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------------------//
|
|
|
|
template<typename T>
|
|
struct char_type_of
|
|
: detail::member_char_type<
|
|
typename detail::unwrapped_type<T>::type
|
|
>
|
|
{ };
|
|
|
|
# else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //---------------------//
|
|
|
|
template<typename T>
|
|
struct char_type_of {
|
|
typedef typename detail::unwrapped_type<T>::type U;
|
|
typedef typename
|
|
mpl::eval_if<
|
|
is_std_io<U>,
|
|
mpl::identity<char>,
|
|
detail::member_char_type<U>
|
|
>::type type;
|
|
};
|
|
|
|
# endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------//
|
|
|
|
template<typename Iter>
|
|
struct char_type_of< iterator_range<Iter> > {
|
|
typedef typename iterator_value<Iter>::type type;
|
|
};
|
|
|
|
|
|
//------------------Definitions of category_of--------------------------------//
|
|
|
|
namespace detail {
|
|
|
|
template<typename T>
|
|
struct member_category { typedef typename T::category type; };
|
|
|
|
} // End namespace detail.
|
|
|
|
template<typename T>
|
|
struct category_of {
|
|
template<typename U>
|
|
struct member_category {
|
|
typedef typename U::category type;
|
|
};
|
|
typedef typename detail::unwrapped_type<T>::type U;
|
|
typedef typename
|
|
mpl::eval_if<
|
|
mpl::and_<
|
|
is_std_io<U>,
|
|
mpl::not_< detail::is_boost<U> >
|
|
>,
|
|
iostreams::select< // Disambiguation for Tru64
|
|
is_filebuf<U>, filebuf_tag,
|
|
is_ifstream<U>, ifstream_tag,
|
|
is_ofstream<U>, ofstream_tag,
|
|
is_fstream<U>, fstream_tag,
|
|
is_stringbuf<U>, stringbuf_tag,
|
|
is_istringstream<U>, istringstream_tag,
|
|
is_ostringstream<U>, ostringstream_tag,
|
|
is_stringstream<U>, stringstream_tag,
|
|
is_streambuf<U>, generic_streambuf_tag,
|
|
is_iostream<U>, generic_iostream_tag,
|
|
is_istream<U>, generic_istream_tag,
|
|
is_ostream<U>, generic_ostream_tag
|
|
>,
|
|
detail::member_category<U>
|
|
>::type type;
|
|
};
|
|
|
|
// Partial specialization for reference wrappers
|
|
|
|
template<typename T>
|
|
struct category_of< reference_wrapper<T> >
|
|
: category_of<T>
|
|
{ };
|
|
|
|
|
|
//------------------Definition of get_category--------------------------------//
|
|
|
|
//
|
|
// Returns an object of type category_of<T>::type.
|
|
//
|
|
template<typename T>
|
|
inline typename category_of<T>::type get_category(const T&)
|
|
{ typedef typename category_of<T>::type category; return category(); }
|
|
|
|
//------------------Definition of int_type_of---------------------------------//
|
|
|
|
template<typename T>
|
|
struct int_type_of {
|
|
#ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES
|
|
typedef std::char_traits<
|
|
BOOST_DEDUCED_TYPENAME char_type_of<T>::type
|
|
> traits_type;
|
|
typedef typename traits_type::int_type type;
|
|
#else
|
|
typedef int type;
|
|
#endif
|
|
};
|
|
|
|
//------------------Definition of mode_of-------------------------------------//
|
|
|
|
namespace detail {
|
|
|
|
template<int N> struct io_mode_impl;
|
|
|
|
#define BOOST_IOSTREAMS_MODE_HELPER(tag_, id_) \
|
|
case_<id_> io_mode_impl_helper(tag_); \
|
|
template<> struct io_mode_impl<id_> { typedef tag_ type; }; \
|
|
/**/
|
|
BOOST_IOSTREAMS_MODE_HELPER(input, 1)
|
|
BOOST_IOSTREAMS_MODE_HELPER(output, 2)
|
|
BOOST_IOSTREAMS_MODE_HELPER(bidirectional, 3)
|
|
BOOST_IOSTREAMS_MODE_HELPER(input_seekable, 4)
|
|
BOOST_IOSTREAMS_MODE_HELPER(output_seekable, 5)
|
|
BOOST_IOSTREAMS_MODE_HELPER(seekable, 6)
|
|
BOOST_IOSTREAMS_MODE_HELPER(dual_seekable, 7)
|
|
BOOST_IOSTREAMS_MODE_HELPER(bidirectional_seekable, 8)
|
|
BOOST_IOSTREAMS_MODE_HELPER(dual_use, 9)
|
|
#undef BOOST_IOSTREAMS_MODE_HELPER
|
|
|
|
template<typename T>
|
|
struct io_mode_id {
|
|
typedef typename category_of<T>::type category;
|
|
BOOST_SELECT_BY_SIZE(int, value, detail::io_mode_impl_helper(category()));
|
|
};
|
|
|
|
} // End namespace detail.
|
|
|
|
template<typename T> // Borland 5.6.4 requires this circumlocution.
|
|
struct mode_of : detail::io_mode_impl< detail::io_mode_id<T>::value > { };
|
|
|
|
// Partial specialization for reference wrappers
|
|
|
|
template<typename T>
|
|
struct mode_of< reference_wrapper<T> >
|
|
: mode_of<T>
|
|
{ };
|
|
|
|
|
|
//------------------Definition of is_device, is_filter and is_direct----------//
|
|
|
|
namespace detail {
|
|
|
|
template<typename T, typename Tag>
|
|
struct has_trait_impl {
|
|
typedef typename category_of<T>::type category;
|
|
BOOST_STATIC_CONSTANT(bool, value = (is_convertible<category, Tag>::value));
|
|
};
|
|
|
|
template<typename T, typename Tag>
|
|
struct has_trait
|
|
: mpl::bool_<has_trait_impl<T, Tag>::value>
|
|
{ };
|
|
|
|
} // End namespace detail.
|
|
|
|
template<typename T>
|
|
struct is_device : detail::has_trait<T, device_tag> { };
|
|
|
|
template<typename T>
|
|
struct is_filter : detail::has_trait<T, filter_tag> { };
|
|
|
|
template<typename T>
|
|
struct is_direct : detail::has_trait<T, direct_tag> { };
|
|
|
|
//------------------Definition of BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS----------//
|
|
|
|
#define BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \
|
|
typedef Tr traits_type; \
|
|
typedef typename traits_type::int_type int_type; \
|
|
typedef typename traits_type::off_type off_type; \
|
|
typedef typename traits_type::pos_type pos_type; \
|
|
/**/
|
|
|
|
} } // End namespaces iostreams, boost.
|
|
|
|
#include <boost/iostreams/detail/config/enable_warnings.hpp>
|
|
|
|
#endif // #ifndef BOOST_IOSTREAMS_IO_TRAITS_HPP_INCLUDED
|