1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/ossrv/ossrv_pub/boost_apis/boost/iostreams/checked_operations.hpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,150 @@
1.4 +// (C) Copyright Jonathan Turkanis 2005.
1.5 +// Distributed under the Boost Software License, Version 1.0. (See accompanying
1.6 +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
1.7 +
1.8 +// See http://www.boost.org/libs/iostreams for documentation.
1.9 +
1.10 +// Contains implementations of get, read, put, write and seek which
1.11 +// check a device's mode at runtime instead of compile time.
1.12 +
1.13 +#ifndef BOOST_IOSTREAMS_DETAIL_CHECKED_OPERATIONS_HPP_INCLUDED
1.14 +#define BOOST_IOSTREAMS_DETAIL_CHECKED_OPERATIONS_HPP_INCLUDED
1.15 +
1.16 +#include <boost/iostreams/categories.hpp>
1.17 +#include <boost/iostreams/detail/dispatch.hpp>
1.18 +#include <boost/iostreams/detail/error.hpp>
1.19 +#include <boost/iostreams/get.hpp>
1.20 +#include <boost/iostreams/put.hpp>
1.21 +#include <boost/iostreams/read.hpp>
1.22 +#include <boost/iostreams/seek.hpp>
1.23 +#include <boost/iostreams/traits.hpp>
1.24 +#include <boost/iostreams/write.hpp>
1.25 +
1.26 +// Must come last.
1.27 +#include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC.
1.28 +
1.29 +namespace boost { namespace iostreams {
1.30 +
1.31 +namespace detail {
1.32 +
1.33 +template<typename T>
1.34 +struct read_write_if_impl;
1.35 +
1.36 +template<typename T>
1.37 +struct seek_if_impl;
1.38 +
1.39 +} // End namespace detail.
1.40 +
1.41 +template<typename T>
1.42 +typename int_type_of<T>::type get_if(T& t)
1.43 +{
1.44 + typedef typename detail::dispatch<T, input, output>::type tag;
1.45 + return detail::read_write_if_impl<tag>::get(t);
1.46 +}
1.47 +
1.48 +template<typename T>
1.49 +inline std::streamsize
1.50 +read_if(T& t, typename char_type_of<T>::type* s, std::streamsize n)
1.51 +{
1.52 + typedef typename detail::dispatch<T, input, output>::type tag;
1.53 + return detail::read_write_if_impl<tag>::read(t, s, n);
1.54 +}
1.55 +
1.56 +template<typename T>
1.57 +bool put_if(T& t, typename char_type_of<T>::type c)
1.58 +{
1.59 + typedef typename detail::dispatch<T, output, input>::type tag;
1.60 + return detail::read_write_if_impl<tag>::put(t, c);
1.61 +}
1.62 +
1.63 +template<typename T>
1.64 +inline std::streamsize write_if
1.65 + (T& t, const typename char_type_of<T>::type* s, std::streamsize n)
1.66 +{
1.67 + typedef typename detail::dispatch<T, output, input>::type tag;
1.68 + return detail::read_write_if_impl<tag>::write(t, s, n);
1.69 +}
1.70 +
1.71 +template<typename T>
1.72 +inline std::streampos
1.73 +seek_if( T& t, stream_offset off, BOOST_IOS::seekdir way,
1.74 + BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out )
1.75 +{
1.76 + using namespace detail;
1.77 + typedef typename dispatch<T, random_access, any_tag>::type tag;
1.78 + return seek_if_impl<tag>::seek(t, off, way, which);
1.79 +}
1.80 +
1.81 +namespace detail {
1.82 +
1.83 +//------------------Specializations of read_write_if_impl---------------------//
1.84 +
1.85 +template<>
1.86 +struct read_write_if_impl<input> {
1.87 + template<typename T>
1.88 + static typename int_type_of<T>::type get(T& t)
1.89 + { return iostreams::get(t); }
1.90 +
1.91 + template<typename T>
1.92 + static std::streamsize
1.93 + read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
1.94 + { return iostreams::read(t, s, n); }
1.95 +
1.96 + template<typename T>
1.97 + static bool put(T&, typename char_type_of<T>::type)
1.98 + { throw cant_write(); }
1.99 +
1.100 + template<typename T>
1.101 + static std::streamsize
1.102 + write(T&, const typename char_type_of<T>::type*, std::streamsize)
1.103 + { throw cant_write(); }
1.104 +};
1.105 +
1.106 +template<>
1.107 +struct read_write_if_impl<output> {
1.108 + template<typename T>
1.109 + static typename int_type_of<T>::type get(T&)
1.110 + { throw cant_read(); }
1.111 +
1.112 + template<typename T>
1.113 + static std::streamsize
1.114 + read(T&, typename char_type_of<T>::type*, std::streamsize)
1.115 + { throw cant_read(); }
1.116 +
1.117 + template<typename T>
1.118 + static bool put(T& t, typename char_type_of<T>::type c)
1.119 + { return iostreams::put(t, c); }
1.120 +
1.121 + template<typename T>
1.122 + static std::streamsize
1.123 + write( T& t, const typename char_type_of<T>::type* s,
1.124 + std::streamsize n )
1.125 + { return iostreams::write(t, s, n); }
1.126 +};
1.127 +
1.128 +//------------------Specializations of seek_if_impl---------------------------//
1.129 +
1.130 +template<>
1.131 +struct seek_if_impl<random_access> {
1.132 + template<typename T>
1.133 + static stream_offset
1.134 + seek( T& t, stream_offset off, BOOST_IOS::seekdir way,
1.135 + BOOST_IOS::openmode which )
1.136 + { return iostreams::seek(t, off, way, which); }
1.137 +};
1.138 +
1.139 +template<>
1.140 +struct seek_if_impl<any_tag> {
1.141 + template<typename T>
1.142 + static stream_offset
1.143 + seek(T&, stream_offset, BOOST_IOS::seekdir, BOOST_IOS::openmode)
1.144 + { throw cant_seek(); }
1.145 +};
1.146 +
1.147 +} // End namespace detail.
1.148 +
1.149 +} } // End namespaces iostreams, boost.
1.150 +
1.151 +#include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC.
1.152 +
1.153 +#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CHECKED_OPERATIONS_HPP_INCLUDED