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simplified definition of io_category

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[SVN r27191]
This commit is contained in:
Jonathan Turkanis
2005-02-06 22:08:42 +00:00
parent e0d9f4ef40
commit fef97412e2
1 changed files with 17 additions and 41 deletions
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58
include/boost/iostreams/traits.hpp
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@@ -57,7 +57,7 @@ struct is_std_io
namespace detail {
template<typename T>
struct get_char_type { typedef typename T::char_type type; };
struct member_char_type { typedef typename T::char_type type; };
} // End namespace detail.
@@ -65,7 +65,7 @@ struct get_char_type { typedef typename T::char_type type; };
template<typename T>
struct io_char
: detail::get_char_type<
: detail::member_char_type<
typename detail::unwrapped_type<T>::type
>
{ };
@@ -87,7 +87,7 @@ struct io_char {
mpl::eval_if<
is_iterator_range<T>,
get_value_type<T>,
detail::get_char_type<
detail::member_char_type<
BOOST_DEDUCED_TYPENAME detail::unwrapped_type<T>::type
>
>::type type;
@@ -104,50 +104,26 @@ struct member_io_category { typedef typename T::io_category type; };
} // End namespace detail.
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //---------------------------//
template<typename T>
struct io_category {
typedef typename
select<
is_iostream<T>, iostream_tag,
is_istream<T>, istream_tag,
is_ostream<T>, ostream_tag,
is_streambuf<T>, streambuf_tag,
is_stringstream<T>, stringstream_tag,
is_stringbuf<T>, stringbuf_tag,
mpl::true_, lazy< detail::member_io_category<T> >
>::type type;
};
template<typename T>
struct io_category< boost::reference_wrapper<T> >
: io_category<T>
{ };
template<typename T>
struct io_category< const boost::reference_wrapper<T> >
: io_category<T>
{ };
#else // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //------------------//
template<typename T>
struct io_category {
template<typename U>
struct member_io_category {
typedef typename U::io_category type;
};
typedef typename detail::unwrapped_type<T>::type U;
typedef typename
select<
is_iostream<U>, iostream_tag,
is_istream<U>, istream_tag,
is_ostream<U>, ostream_tag,
is_streambuf<U>, streambuf_tag,
is_stringstream<U>, stringstream_tag,
is_stringbuf<U>, stringbuf_tag,
mpl::true_, lazy< detail::member_io_category<U> >
>::type type;
mpl::eval_if<
is_std_io<U>,
select<
is_iostream<U>, iostream_tag,
is_istream<U>, istream_tag,
is_ostream<U>, ostream_tag,
is_streambuf<U>, streambuf_tag
>,
detail::member_io_category<U>
>::type type;
};
#endif // #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION //-----------------//
//------------------Definition of get_category--------------------------------//
//