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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/iostreams/read.hpp')
| -rw-r--r-- | src/third_party/boost-1.69.0/boost/iostreams/read.hpp | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/iostreams/read.hpp b/src/third_party/boost-1.69.0/boost/iostreams/read.hpp new file mode 100644 index 00000000000..a8652c5644b --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/iostreams/read.hpp @@ -0,0 +1,241 @@ +// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) +// (C) Copyright 2005-2007 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_READ_HPP_INCLUDED +#define BOOST_IOSTREAMS_READ_HPP_INCLUDED + +#if defined(_MSC_VER) +# pragma once +#endif + +#include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC. +#include <boost/detail/workaround.hpp> +#include <boost/iostreams/char_traits.hpp> +#include <boost/iostreams/detail/char_traits.hpp> +#include <boost/iostreams/detail/dispatch.hpp> +#include <boost/iostreams/detail/ios.hpp> // streamsize. +#include <boost/iostreams/detail/streambuf.hpp> +#include <boost/iostreams/detail/wrap_unwrap.hpp> +#include <boost/iostreams/operations_fwd.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 read_device_impl; + +template<typename T> +struct read_filter_impl; + +} // End namespace detail. + +template<typename T> +typename int_type_of<T>::type get(T& t) +{ return detail::read_device_impl<T>::get(detail::unwrap(t)); } + +template<typename T> +inline std::streamsize +read(T& t, typename char_type_of<T>::type* s, std::streamsize n) +{ return detail::read_device_impl<T>::read(detail::unwrap(t), s, n); } + +template<typename T, typename Source> +std::streamsize +read(T& t, Source& src, typename char_type_of<T>::type* s, std::streamsize n) +{ return detail::read_filter_impl<T>::read(detail::unwrap(t), src, s, n); } + +template<typename T> +bool putback(T& t, typename char_type_of<T>::type c) +{ return detail::read_device_impl<T>::putback(detail::unwrap(t), c); } + +//----------------------------------------------------------------------------// + +namespace detail { + +// Helper function for adding -1 as EOF indicator. +inline std::streamsize check_eof(std::streamsize n) { return n != 0 ? n : -1; } + +// Helper templates for reading from streambufs. +template<bool IsLinked> +struct true_eof_impl; + +template<> +struct true_eof_impl<true> { + template<typename T> + static bool true_eof(T& t) { return t.true_eof(); } +}; + +template<> +struct true_eof_impl<false> { + template<typename T> + static bool true_eof(T&) { return true; } +}; + +template<typename T> +inline bool true_eof(T& t) +{ + const bool linked = is_linked<T>::value; + return true_eof_impl<linked>::true_eof(t); +} + +//------------------Definition of read_device_impl----------------------------// + +template<typename T> +struct read_device_impl + : mpl::if_< + detail::is_custom<T>, + operations<T>, + read_device_impl< + BOOST_DEDUCED_TYPENAME + detail::dispatch< + T, istream_tag, streambuf_tag, input + >::type + > + >::type + { }; + +template<> +struct read_device_impl<istream_tag> { + template<typename T> + static typename int_type_of<T>::type get(T& t) + { return t.get(); } + + template<typename T> + static std::streamsize + read(T& t, typename char_type_of<T>::type* s, std::streamsize n) + { return check_eof(t.rdbuf()->sgetn(s, n)); } + + template<typename T> + static bool putback(T& t, typename char_type_of<T>::type c) + { + typedef typename char_type_of<T>::type char_type; + typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) traits_type; + return !traits_type::eq_int_type( t.rdbuf()->sputbackc(c), + traits_type::eof() ); + } +}; + +template<> +struct read_device_impl<streambuf_tag> { + template<typename T> + static typename int_type_of<T>::type + get(T& t) + { // gcc 2.95 needs namespace qualification for char_traits. + typedef typename char_type_of<T>::type char_type; + typedef iostreams::char_traits<char_type> traits_type; + typename int_type_of<T>::type c; + return !traits_type::is_eof(c = t.sbumpc()) || + detail::true_eof(t) + ? + c : traits_type::would_block(); + } + + template<typename T> + static std::streamsize + read(T& t, typename char_type_of<T>::type* s, std::streamsize n) + { + std::streamsize amt; + return (amt = t.sgetn(s, n)) != 0 ? + amt : + detail::true_eof(t) ? + -1 : + 0; + } + + template<typename T> + static bool putback(T& t, typename char_type_of<T>::type c) + { // gcc 2.95 needs namespace qualification for char_traits. + typedef typename char_type_of<T>::type char_type; + typedef iostreams::char_traits<char_type> traits_type; + return !traits_type::is_eof(t.sputbackc(c)); + } +}; + +template<> +struct read_device_impl<input> { + template<typename T> + static typename int_type_of<T>::type + get(T& t) + { // gcc 2.95 needs namespace qualification for char_traits. + typedef typename char_type_of<T>::type char_type; + typedef iostreams::char_traits<char_type> traits_type; + char_type c; + std::streamsize amt; + return (amt = t.read(&c, 1)) == 1 ? + traits_type::to_int_type(c) : + amt == -1 ? + traits_type::eof() : + traits_type::would_block(); + } + + template<typename T> + static std::streamsize + read(T& t, typename char_type_of<T>::type* s, std::streamsize n) + { return t.read(s, n); } + + template<typename T> + static bool putback(T& t, typename char_type_of<T>::type c) + { // T must be Peekable. + return t.putback(c); + } +}; + +//------------------Definition of read_filter_impl----------------------------// + +template<typename T> +struct read_filter_impl + : mpl::if_< + detail::is_custom<T>, + operations<T>, + read_filter_impl< + BOOST_DEDUCED_TYPENAME + detail::dispatch< + T, multichar_tag, any_tag + >::type + > + >::type + { }; + +template<> +struct read_filter_impl<multichar_tag> { + template<typename T, typename Source> + static std::streamsize read + (T& t, Source& src, typename char_type_of<T>::type* s, std::streamsize n) + { return t.read(src, s, n); } +}; + +template<> +struct read_filter_impl<any_tag> { + template<typename T, typename Source> + static std::streamsize read + (T& t, Source& src, typename char_type_of<T>::type* s, std::streamsize n) + { // gcc 2.95 needs namespace qualification for char_traits. + typedef typename char_type_of<T>::type char_type; + typedef iostreams::char_traits<char_type> traits_type; + for (std::streamsize off = 0; off < n; ++off) { + typename traits_type::int_type c = t.get(src); + if (traits_type::is_eof(c)) + return check_eof(off); + if (traits_type::would_block(c)) + return off; + s[off] = traits_type::to_char_type(c); + } + return n; + } +}; + +} // End namespace detail. + +} } // End namespaces iostreams, boost. + +#include <boost/iostreams/detail/config/enable_warnings.hpp> + +#endif // #ifndef BOOST_IOSTREAMS_READ_HPP_INCLUDED |