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158 lines
4.8 KiB
158 lines
4.8 KiB
// (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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// Contains implementations of get, read, put, write and seek which |
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// check a device's mode at runtime instead of compile time. |
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#ifndef BOOST_IOSTREAMS_DETAIL_CHECKED_OPERATIONS_HPP_INCLUDED |
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#define BOOST_IOSTREAMS_DETAIL_CHECKED_OPERATIONS_HPP_INCLUDED |
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#include <boost/iostreams/categories.hpp> |
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#include <boost/iostreams/detail/dispatch.hpp> |
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#include <boost/iostreams/detail/error.hpp> |
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#include <boost/iostreams/detail/config/unreachable_return.hpp> |
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#include <boost/iostreams/get.hpp> |
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#include <boost/iostreams/put.hpp> |
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#include <boost/iostreams/read.hpp> |
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#include <boost/iostreams/seek.hpp> |
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#include <boost/iostreams/traits.hpp> |
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#include <boost/iostreams/write.hpp> |
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#include <boost/throw_exception.hpp> |
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// Must come last. |
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#include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC. |
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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 read_write_if_impl; |
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template<typename T> |
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struct seek_if_impl; |
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} // End namespace detail. |
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template<typename T> |
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typename int_type_of<T>::type get_if(T& t) |
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{ |
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typedef typename detail::dispatch<T, input, output>::type tag; |
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return detail::read_write_if_impl<tag>::get(t); |
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} |
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template<typename T> |
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inline std::streamsize |
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read_if(T& t, typename char_type_of<T>::type* s, std::streamsize n) |
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{ |
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typedef typename detail::dispatch<T, input, output>::type tag; |
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return detail::read_write_if_impl<tag>::read(t, s, n); |
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} |
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template<typename T> |
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bool put_if(T& t, typename char_type_of<T>::type c) |
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{ |
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typedef typename detail::dispatch<T, output, input>::type tag; |
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return detail::read_write_if_impl<tag>::put(t, c); |
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} |
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template<typename T> |
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inline std::streamsize write_if |
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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::dispatch<T, output, input>::type tag; |
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return detail::read_write_if_impl<tag>::write(t, s, n); |
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} |
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template<typename T> |
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inline std::streampos |
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seek_if( T& t, stream_offset off, BOOST_IOS::seekdir way, |
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BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out ) |
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{ |
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using namespace detail; |
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typedef typename dispatch<T, random_access, any_tag>::type tag; |
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return seek_if_impl<tag>::seek(t, off, way, which); |
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} |
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namespace detail { |
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//------------------Specializations of read_write_if_impl---------------------// |
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template<> |
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struct read_write_if_impl<input> { |
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template<typename T> |
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static typename int_type_of<T>::type get(T& t) |
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{ return iostreams::get(t); } |
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template<typename T> |
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static std::streamsize |
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read(T& t, typename char_type_of<T>::type* s, std::streamsize n) |
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{ return iostreams::read(t, s, n); } |
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template<typename T> |
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static bool put(T&, typename char_type_of<T>::type) |
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{ boost::throw_exception(cant_write()); |
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(false) } |
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template<typename T> |
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static std::streamsize |
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write(T&, const typename char_type_of<T>::type*, std::streamsize) |
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{ boost::throw_exception(cant_write()); |
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) } |
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}; |
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template<> |
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struct read_write_if_impl<output> { |
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template<typename T> |
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static typename int_type_of<T>::type get(T&) |
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{ boost::throw_exception(cant_read()); |
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) } |
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template<typename T> |
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static std::streamsize |
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read(T&, typename char_type_of<T>::type*, std::streamsize) |
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{ boost::throw_exception(cant_read()); |
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(0) } |
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template<typename T> |
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static bool put(T& t, typename char_type_of<T>::type c) |
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{ return iostreams::put(t, c); } |
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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, |
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std::streamsize n ) |
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{ return iostreams::write(t, s, n); } |
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}; |
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//------------------Specializations of seek_if_impl---------------------------// |
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template<> |
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struct seek_if_impl<random_access> { |
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template<typename T> |
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static std::streampos |
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seek( T& t, stream_offset off, BOOST_IOS::seekdir way, |
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BOOST_IOS::openmode which ) |
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{ return iostreams::seek(t, off, way, which); } |
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}; |
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template<> |
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struct seek_if_impl<any_tag> { |
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template<typename T> |
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static std::streampos |
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seek(T&, stream_offset, BOOST_IOS::seekdir, BOOST_IOS::openmode) |
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{ boost::throw_exception(cant_seek()); |
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BOOST_IOSTREAMS_UNREACHABLE_RETURN(std::streampos()) } |
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}; |
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} // End namespace detail. |
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} } // End namespaces iostreams, boost. |
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#include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC. |
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CHECKED_OPERATIONS_HPP_INCLUDED
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