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added overload for filters

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[SVN r29127]
This commit is contained in:
Jonathan Turkanis
2005-05-21 20:13:29 +00:00
parent 6d3f7e0e5c
commit 5a75413edf
1 changed files with 60 additions and 11 deletions
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71
include/boost/iostreams/seek.hpp
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@@ -30,7 +30,10 @@ namespace boost { namespace iostreams {
namespace detail {
template<typename T>
struct seek_impl;
struct seek_device_impl;
template<typename T>
struct seek_filter_impl;
} // End namespace detail.
@@ -38,18 +41,30 @@ template<typename T>
inline std::streampos
seek( T& t, stream_offset off, BOOST_IOS::seekdir way,
BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out )
{ return detail::seek_impl<T>::seek(detail::unwrap(t), off, way, which); }
{
using namespace detail;
return seek_device_impl<T>::seek(detail::unwrap(t), off, way, which);
}
template<typename T, typename Device>
inline std::streampos
seek( T& t, Device& dev, stream_offset off, BOOST_IOS::seekdir way,
BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out )
{
using namespace detail;
return seek_filter_impl<T>::seek(detail::unwrap(t), dev, off, way, which);
}
namespace detail {
//------------------Definition of seek_impl-----------------------------------//
//------------------Definition of seek_device_impl----------------------------//
template<typename T>
struct seek_impl
struct seek_device_impl
: mpl::if_<
is_custom<T>,
operations<T>,
seek_impl<
seek_device_impl<
BOOST_DEDUCED_TYPENAME
dispatch<
T, iostream_tag, istream_tag, ostream_tag,
@@ -77,16 +92,16 @@ struct seek_impl_basic_ios {
};
template<>
struct seek_impl<iostream_tag> : seek_impl_basic_ios { };
struct seek_device_impl<iostream_tag> : seek_impl_basic_ios { };
template<>
struct seek_impl<istream_tag> : seek_impl_basic_ios { };
struct seek_device_impl<istream_tag> : seek_impl_basic_ios { };
template<>
struct seek_impl<ostream_tag> : seek_impl_basic_ios { };
struct seek_device_impl<ostream_tag> : seek_impl_basic_ios { };
template<>
struct seek_impl<streambuf_tag> {
struct seek_device_impl<streambuf_tag> {
template<typename T>
static std::streampos seek( T& t, stream_offset off,
BOOST_IOS::seekdir way,
@@ -104,7 +119,7 @@ struct seek_impl<streambuf_tag> {
};
template<>
struct seek_impl<two_head> {
struct seek_device_impl<two_head> {
template<typename T>
static std::streampos seek( T& t, stream_offset off,
BOOST_IOS::seekdir way,
@@ -113,7 +128,7 @@ struct seek_impl<two_head> {
};
template<>
struct seek_impl<any_tag> {
struct seek_device_impl<any_tag> {
template<typename T>
static std::streampos seek( T& t, stream_offset off,
BOOST_IOS::seekdir way,
@@ -121,6 +136,40 @@ struct seek_impl<any_tag> {
{ return t.seek(off, way); }
};
//------------------Definition of seek_filter_impl----------------------------//
template<typename T>
struct seek_filter_impl
: mpl::if_<
is_custom<T>,
operations<T>,
seek_filter_impl<
BOOST_DEDUCED_TYPENAME
dispatch<T, two_head, any_tag>::type
>
>::type
{ };
template<>
struct seek_filter_impl<two_head> {
template<typename T, typename Device>
static std::streampos seek( T& t, Device& d,
stream_offset off,
BOOST_IOS::seekdir way,
BOOST_IOS::openmode which )
{ return t.seek(d, off, way, which); }
};
template<>
struct seek_filter_impl<any_tag> {
template<typename T, typename Device>
static std::streampos seek( T& t, Device& d,
stream_offset off,
BOOST_IOS::seekdir way,
BOOST_IOS::openmode )
{ return t.seek(d, off, way); }
};
} // End namespace detail.
} } // End namespaces iostreams, boost.