160 lines
4.5 KiB
C++
160 lines
4.5 KiB
C++
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2005-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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namespace boost { namespace iostreams {
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namespace detail {
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template<typename T>
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struct write_device_impl;
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template<typename T>
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struct write_filter_impl;
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} // End namespace detail.
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template<typename T>
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bool put(T& t, typename char_type_of<T>::type c)
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{
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typedef typename detail::unwrapped_type<T>::type unwrapped;
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return detail::write_device_impl<T>::inner<unwrapped>::put(detail::unwrap(t), c);
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}
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template<typename T>
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inline std::streamsize write
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(T& t, const typename char_type_of<T>::type* s, std::streamsize n)
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{
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typedef typename detail::unwrapped_type<T>::type unwrapped;
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return detail::write_device_impl<T>::inner<unwrapped>::write(detail::unwrap(t), s, n);
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}
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template<typename T, typename Sink>
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inline std::streamsize
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write( T& t, Sink& snk, const typename char_type_of<T>::type* s,
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std::streamsize n )
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{
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typedef typename detail::unwrapped_type<T>::type unwrapped;
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return detail::write_filter_impl<T>::inner<unwrapped>::write(detail::unwrap(t), snk, s, n);
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}
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namespace detail {
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//------------------Definition of write_device_impl---------------------------//
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template<typename T>
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struct write_device_impl
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: mpl::if_<
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is_custom<T>,
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operations<T>,
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write_device_impl<
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BOOST_DEDUCED_TYPENAME
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dispatch<
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T, ostream_tag, streambuf_tag, output
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>::type
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>
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>::type
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{ };
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template<>
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struct write_device_impl<ostream_tag> {
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template<typename T>
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struct inner {
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static bool put(T& t, typename char_type_of<T>::type c)
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{
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typedef typename char_type_of<T>::type char_type;
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typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) traits_type;
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return !traits_type::eq_int_type( t.rdbuf()->s.sputc(),
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traits_type::eof() );
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}
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static std::streamsize write
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(T& t, const typename char_type_of<T>::type* s, std::streamsize n)
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{ return t.rdbuf()->sputn(s, n); }
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};
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};
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template<>
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struct write_device_impl<streambuf_tag> {
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template<typename T>
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struct inner {
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static bool put(T& t, typename char_type_of<T>::type c)
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{
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typedef typename char_type_of<T>::type char_type;
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typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) traits_type;
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return !traits_type::eq_int_type(t.sputc(c), traits_type::eof());
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}
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template<typename T>
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static std::streamsize write
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(T& t, const typename char_type_of<T>::type* s, std::streamsize n)
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{ return t.sputn(s, n); }
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};
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};
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template<>
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struct write_device_impl<output> {
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template<typename T>
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struct inner {
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static bool put(T& t, typename char_type_of<T>::type c)
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{ return t.write(&c, 1) == 1; }
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template<typename T>
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static std::streamsize
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write(T& t, const typename char_type_of<T>::type* s, std::streamsize n)
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{ return t.write(s, n); }
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};
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};
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//------------------Definition of write_filter_impl---------------------------//
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template<typename T>
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struct write_filter_impl
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: mpl::if_<
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is_custom<T>,
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operations<T>,
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write_filter_impl<
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BOOST_DEDUCED_TYPENAME
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dispatch<
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T, multichar_tag, any_tag
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>::type
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>
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>::type
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{ };
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template<>
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struct write_filter_impl<multichar_tag> {
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template<typename T>
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struct inner {
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template<typename Sink>
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static std::streamsize
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write( T& t, Sink& snk, const typename char_type_of<T>::type* s,
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std::streamsize n )
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{ return t.write(snk, s, n); }
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};
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};
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template<>
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struct write_filter_impl<any_tag> {
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template<typename T>
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struct inner {
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template<typename Sink>
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static std::streamsize
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write( T& t, Sink& snk, const typename char_type_of<T>::type* s,
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std::streamsize n )
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{
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for (std::streamsize off = 0; off < n; ++off)
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if (!t.put(snk, s[off]))
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return off;
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return n;
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}
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};
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};
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} // End namespace detail.
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} } // End namespaces iostreams, boost.
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