// (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.
|
|
#ifndef BOOST_IOSTREAMS_DETAIL_CONCEPT_ADAPTER_HPP_INCLUDED
|
#define BOOST_IOSTREAMS_DETAIL_CONCEPT_ADAPTER_HPP_INCLUDED
|
|
#include <boost/config.hpp> // SFINAE.
|
#include <boost/iostreams/concepts.hpp>
|
#include <boost/iostreams/categories.hpp>
|
#include <boost/iostreams/detail/adapter/non_blocking_adapter.hpp>
|
#include <boost/iostreams/detail/call_traits.hpp>
|
#include <boost/iostreams/detail/char_traits.hpp>
|
#include <boost/iostreams/detail/dispatch.hpp>
|
#include <boost/iostreams/detail/error.hpp>
|
#include <boost/iostreams/detail/streambuf.hpp> // pubsync.
|
#include <boost/iostreams/detail/config/unreachable_return.hpp>
|
#include <boost/iostreams/device/null.hpp>
|
#include <boost/iostreams/traits.hpp>
|
#include <boost/iostreams/operations.hpp>
|
#include <boost/mpl/if.hpp>
|
#include <boost/static_assert.hpp>
|
#include <boost/throw_exception.hpp>
|
|
// Must come last.
|
#include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC.
|
|
|
namespace boost { namespace iostreams { namespace detail {
|
|
template<typename Category> struct device_wrapper_impl;
|
template<typename Category> struct flt_wrapper_impl;
|
|
template<typename T>
|
class concept_adapter {
|
private:
|
typedef typename detail::value_type<T>::type value_type;
|
typedef typename dispatch<T, input, output>::type input_tag;
|
typedef typename dispatch<T, output, input>::type output_tag;
|
typedef typename
|
mpl::if_<
|
is_device<T>,
|
device_wrapper_impl<input_tag>,
|
flt_wrapper_impl<input_tag>
|
>::type input_impl;
|
typedef typename
|
mpl::if_<
|
is_device<T>,
|
device_wrapper_impl<output_tag>,
|
flt_wrapper_impl<output_tag>
|
>::type output_impl;
|
typedef typename
|
mpl::if_<
|
is_device<T>,
|
device_wrapper_impl<any_tag>,
|
flt_wrapper_impl<any_tag>
|
>::type any_impl;
|
public:
|
typedef typename char_type_of<T>::type char_type;
|
typedef typename category_of<T>::type category;
|
|
explicit concept_adapter(const reference_wrapper<T>& ref) : t_(ref.get())
|
{ BOOST_STATIC_ASSERT(is_std_io<T>::value); }
|
explicit concept_adapter(const T& t) : t_(t)
|
{ BOOST_STATIC_ASSERT(!is_std_io<T>::value); }
|
|
T& operator*() { return t_; }
|
T* operator->() { return &t_; }
|
|
std::streamsize read(char_type* s, std::streamsize n)
|
{ return this->read(s, n, (basic_null_source<char_type>*) 0); }
|
|
template<typename Source>
|
std::streamsize read(char_type* s, std::streamsize n, Source* src)
|
{ return input_impl::read(t_, src, s, n); }
|
|
std::streamsize write(const char_type* s, std::streamsize n)
|
{ return this->write(s, n, (basic_null_sink<char_type>*) 0); }
|
|
template<typename Sink>
|
std::streamsize write(const char_type* s, std::streamsize n, Sink* snk)
|
{ return output_impl::write(t_, snk, s, n); }
|
|
std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
|
BOOST_IOS::openmode which )
|
{
|
return this->seek( off, way, which,
|
(basic_null_device<char_type, seekable>*) 0);
|
}
|
|
template<typename Device>
|
std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
|
BOOST_IOS::openmode which, Device* dev )
|
{ return any_impl::seek(t_, dev, off, way, which); }
|
|
void close(BOOST_IOS::openmode which)
|
{ this->close(which, (basic_null_device<char_type, seekable>*) 0); }
|
|
template<typename Device>
|
void close(BOOST_IOS::openmode which, Device* dev)
|
{ any_impl::close(t_, dev, which); }
|
|
template<typename Device>
|
bool flush( Device* dev )
|
{
|
bool result = any_impl::flush(t_, dev);
|
if (dev && dev->BOOST_IOSTREAMS_PUBSYNC() == -1)
|
result = false;
|
return result;
|
}
|
|
template<typename Locale> // Avoid dependency on <locale>
|
void imbue(const Locale& loc) { iostreams::imbue(t_, loc); }
|
|
std::streamsize optimal_buffer_size() const
|
{ return iostreams::optimal_buffer_size(t_); }
|
private:
|
BOOST_DELETED_FUNCTION(concept_adapter& operator=(const concept_adapter&));
|
value_type t_;
|
};
|
|
//------------------Specializations of device_wrapper_impl--------------------//
|
|
template<>
|
struct device_wrapper_impl<any_tag> {
|
template<typename Device, typename Dummy>
|
static std::streampos
|
seek( Device& dev, Dummy*, stream_offset off,
|
BOOST_IOS::seekdir way, BOOST_IOS::openmode which )
|
{
|
typedef typename category_of<Device>::type category;
|
return seek(dev, off, way, which, category());
|
}
|
|
template<typename Device>
|
static std::streampos
|
seek( Device&, stream_offset, BOOST_IOS::seekdir,
|
BOOST_IOS::openmode, any_tag )
|
{
|
boost::throw_exception(cant_seek());
|
BOOST_IOSTREAMS_UNREACHABLE_RETURN(0)
|
}
|
|
template<typename Device>
|
static std::streampos
|
seek( Device& dev, stream_offset off,
|
BOOST_IOS::seekdir way, BOOST_IOS::openmode which,
|
random_access )
|
{
|
return iostreams::seek(dev, off, way, which);
|
}
|
|
template<typename Device, typename Dummy>
|
static void close(Device& dev, Dummy*, BOOST_IOS::openmode which)
|
{ iostreams::close(dev, which); }
|
|
template<typename Device, typename Dummy>
|
static bool flush(Device& dev, Dummy*)
|
{ return iostreams::flush(dev); }
|
};
|
|
|
template<>
|
struct device_wrapper_impl<input> : device_wrapper_impl<any_tag> {
|
template<typename Device, typename Dummy>
|
static std::streamsize
|
read( Device& dev, Dummy*, typename char_type_of<Device>::type* s,
|
std::streamsize n )
|
{ return iostreams::read(dev, s, n); }
|
|
template<typename Device, typename Dummy>
|
static std::streamsize
|
write( Device&, Dummy*, const typename char_type_of<Device>::type*,
|
std::streamsize )
|
{ boost::throw_exception(cant_write());
|
BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
|
};
|
|
template<>
|
struct device_wrapper_impl<output> {
|
template<typename Device, typename Dummy>
|
static std::streamsize
|
read(Device&, Dummy*, typename char_type_of<Device>::type*, std::streamsize)
|
{ boost::throw_exception(cant_read());
|
BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
|
|
template<typename Device, typename Dummy>
|
static std::streamsize
|
write( Device& dev, Dummy*, const typename char_type_of<Device>::type* s,
|
std::streamsize n )
|
{ return iostreams::write(dev, s, n); }
|
};
|
|
//------------------Specializations of flt_wrapper_impl--------------------//
|
|
template<>
|
struct flt_wrapper_impl<any_tag> {
|
template<typename Filter, typename Device>
|
static std::streampos
|
seek( Filter& f, Device* dev, stream_offset off,
|
BOOST_IOS::seekdir way, BOOST_IOS::openmode which )
|
{
|
typedef typename category_of<Filter>::type category;
|
return seek(f, dev, off, way, which, category());
|
}
|
|
template<typename Filter, typename Device>
|
static std::streampos
|
seek( Filter&, Device*, stream_offset,
|
BOOST_IOS::seekdir, BOOST_IOS::openmode, any_tag )
|
{ boost::throw_exception(cant_seek());
|
BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
|
|
template<typename Filter, typename Device>
|
static std::streampos
|
seek( Filter& f, Device* dev, stream_offset off,
|
BOOST_IOS::seekdir way, BOOST_IOS::openmode which,
|
random_access tag )
|
{
|
typedef typename category_of<Filter>::type category;
|
return seek(f, dev, off, way, which, tag, category());
|
}
|
|
template<typename Filter, typename Device>
|
static std::streampos
|
seek( Filter& f, Device* dev, stream_offset off,
|
BOOST_IOS::seekdir way, BOOST_IOS::openmode,
|
random_access, any_tag )
|
{ return f.seek(*dev, off, way); }
|
|
template<typename Filter, typename Device>
|
static std::streampos
|
seek( Filter& f, Device* dev, stream_offset off,
|
BOOST_IOS::seekdir way, BOOST_IOS::openmode which,
|
random_access, two_sequence )
|
{ return f.seek(*dev, off, way, which); }
|
|
template<typename Filter, typename Device>
|
static void close(Filter& f, Device* dev, BOOST_IOS::openmode which)
|
{ iostreams::close(f, *dev, which); }
|
|
template<typename Filter, typename Device>
|
static bool flush(Filter& f, Device* dev)
|
{ return iostreams::flush(f, *dev); }
|
};
|
|
template<>
|
struct flt_wrapper_impl<input> {
|
template<typename Filter, typename Source>
|
static std::streamsize
|
read( Filter& f, Source* src, typename char_type_of<Filter>::type* s,
|
std::streamsize n )
|
{ return iostreams::read(f, *src, s, n); }
|
|
template<typename Filter, typename Sink>
|
static std::streamsize
|
write( Filter&, Sink*, const typename char_type_of<Filter>::type*,
|
std::streamsize )
|
{ boost::throw_exception(cant_write());
|
BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
|
};
|
|
template<>
|
struct flt_wrapper_impl<output> {
|
template<typename Filter, typename Source>
|
static std::streamsize
|
read(Filter&, Source*, typename char_type_of<Filter>::type*,std::streamsize)
|
{ boost::throw_exception(cant_read());
|
BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) }
|
|
template<typename Filter, typename Sink>
|
static std::streamsize
|
write( Filter& f, Sink* snk, const typename char_type_of<Filter>::type* s,
|
std::streamsize n )
|
{ return iostreams::write(f, *snk, s, n); }
|
};
|
|
//----------------------------------------------------------------------------//
|
|
} } } // End namespaces detail, iostreams, boost.
|
|
#include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC.
|
|
#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CONCEPT_ADAPTER_HPP_INCLUDED
|
