liuxiaolong
2021-07-20 58d904a328c0d849769b483e901a0be9426b8209
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// (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_OUTPUT_SEQUENCE_HPP_INCLUDED
#define BOOST_IOSTREAMS_OUTPUT_SEQUENCE_HPP_INCLUDED
 
#if defined(_MSC_VER)
# pragma once
#endif
 
#include <utility>           // pair.
#include <boost/config.hpp>  // DEDUCED_TYPENAME, MSVC.
#include <boost/detail/workaround.hpp>
#include <boost/iostreams/detail/wrap_unwrap.hpp>
#include <boost/iostreams/operations_fwd.hpp>  // is_custom 
#include <boost/iostreams/traits.hpp>
#include <boost/mpl/if.hpp>
 
// Must come last.
#include <boost/iostreams/detail/config/disable_warnings.hpp>
 
namespace boost { namespace iostreams {
 
namespace detail {
 
template<typename T>
struct output_sequence_impl;
 
} // End namespace detail.
 
template<typename T>
inline std::pair<
    BOOST_DEDUCED_TYPENAME char_type_of<T>::type*,
    BOOST_DEDUCED_TYPENAME char_type_of<T>::type*
>
output_sequence(T& t)
{ return detail::output_sequence_impl<T>::output_sequence(t); }
 
namespace detail {
 
//------------------Definition of output_sequence_impl------------------------//
 
template<typename T>
struct output_sequence_impl
    : mpl::if_<
          detail::is_custom<T>,
          operations<T>,
          output_sequence_impl<direct_tag>
      >::type
    { };
 
template<>
struct output_sequence_impl<direct_tag> {
    template<typename U>
    static std::pair<
        BOOST_DEDUCED_TYPENAME char_type_of<U>::type*,
        BOOST_DEDUCED_TYPENAME char_type_of<U>::type*
    >
    output_sequence(U& u) { return u.output_sequence(); }
};
 
} // End namespace detail.
 
} } // End namespaces iostreams, boost.
 
#include <boost/iostreams/detail/config/enable_warnings.hpp>
 
#endif // #ifndef BOOST_IOSTREAMS_OUTPUT_SEQUENCE_HPP_INCLUDED