1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) 2 // (C) Copyright 2003-2007 Jonathan Turkanis 3 // Distributed under the Boost Software License, Version 1.0. (See accompanying 4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) 5 6 // See http://www.boost.org/libs/iostreams for documentation. 7 8 #ifndef BOOST_IOSTREAMS_STREAM_HPP_INCLUDED 9 #define BOOST_IOSTREAMS_STREAM_HPP_INCLUDED 10 11 #if defined(_MSC_VER) && (_MSC_VER >= 1020) 12 # pragma once 13 #endif 14 15 #include <boost/iostreams/constants.hpp> 16 #include <boost/iostreams/detail/char_traits.hpp> 17 #include <boost/iostreams/detail/config/overload_resolution.hpp> 18 #include <boost/iostreams/detail/forward.hpp> 19 #include <boost/iostreams/detail/iostream.hpp> // standard streams. 20 #include <boost/iostreams/detail/select.hpp> 21 #include <boost/iostreams/stream_buffer.hpp> 22 #include <boost/mpl/and.hpp> 23 #include <boost/type_traits/is_convertible.hpp> 24 #include <boost/utility/base_from_member.hpp> 25 26 namespace boost { namespace iostreams { namespace detail { 27 28 template<typename Device, typename Tr> 29 struct stream_traits { 30 typedef typename char_type_of<Device>::type char_type; 31 typedef Tr traits_type; 32 typedef typename category_of<Device>::type mode; 33 typedef typename 34 iostreams::select< // Disambiguation required for Tru64. 35 mpl::and_< 36 is_convertible<mode, input>, 37 is_convertible<mode, output> 38 >, 39 BOOST_IOSTREAMS_BASIC_IOSTREAM(char_type, traits_type), 40 is_convertible<mode, input>, 41 BOOST_IOSTREAMS_BASIC_ISTREAM(char_type, traits_type), 42 else_, 43 BOOST_IOSTREAMS_BASIC_OSTREAM(char_type, traits_type) 44 >::type stream_type; 45 typedef typename 46 iostreams::select< // Disambiguation required for Tru64. 47 mpl::and_< 48 is_convertible<mode, input>, 49 is_convertible<mode, output> 50 >, 51 iostream_tag, 52 is_convertible<mode, input>, 53 istream_tag, 54 else_, 55 ostream_tag 56 >::type stream_tag; 57 }; 58 59 // By encapsulating initialization in a base, we can define the macro 60 // BOOST_IOSTREAMS_DEFINE_FORWARDING_FUNCTIONS to generate constructors 61 // without base member initializer lists. 62 template< typename Device, 63 typename Tr = 64 BOOST_IOSTREAMS_CHAR_TRAITS( 65 BOOST_DEDUCED_TYPENAME char_type_of<Device>::type 66 ), 67 typename Alloc = 68 std::allocator< 69 BOOST_DEDUCED_TYPENAME char_type_of<Device>::type 70 >, 71 typename Base = // VC6 Workaround. 72 BOOST_DEDUCED_TYPENAME 73 detail::stream_traits<Device, Tr>::stream_type > 74 class stream_base 75 : protected base_from_member< stream_buffer<Device, Tr, Alloc> >, 76 public Base 77 { 78 private: 79 typedef base_from_member< stream_buffer<Device, Tr, Alloc> > pbase_type; 80 typedef typename stream_traits<Device, Tr>::stream_type stream_type; 81 protected: 82 using pbase_type::member; // Avoid warning about 'this' in initializer list. 83 public: stream_base()84 stream_base() : pbase_type(), stream_type(&member) { } 85 }; 86 87 } } } // End namespaces detail, iostreams, boost. 88 89 #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION 90 # include <boost/iostreams/detail/broken_overload_resolution/stream.hpp> 91 #else 92 93 namespace boost { namespace iostreams { 94 95 // 96 // Template name: stream. 97 // Description: A iostream which reads from and writes to an instance of a 98 // designated device type. 99 // Template parameters: 100 // Device - A device type. 101 // Alloc - The allocator type. 102 // 103 template< typename Device, 104 typename Tr = 105 BOOST_IOSTREAMS_CHAR_TRAITS( 106 BOOST_DEDUCED_TYPENAME char_type_of<Device>::type 107 ), 108 typename Alloc = 109 std::allocator< 110 BOOST_DEDUCED_TYPENAME char_type_of<Device>::type 111 > > 112 struct stream : detail::stream_base<Device, Tr, Alloc> { 113 public: 114 typedef typename char_type_of<Device>::type char_type; 115 struct category 116 : mode_of<Device>::type, 117 closable_tag, 118 detail::stream_traits<Device, Tr>::stream_tag 119 { }; 120 BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) 121 private: 122 typedef typename 123 detail::stream_traits< 124 Device, Tr 125 >::stream_type stream_type; 126 public: streamboost::iostreams::stream127 stream() { } BOOST_IOSTREAMS_FORWARDboost::iostreams::stream128 BOOST_IOSTREAMS_FORWARD( stream, open_impl, Device, 129 BOOST_IOSTREAMS_PUSH_PARAMS, 130 BOOST_IOSTREAMS_PUSH_ARGS ) 131 bool is_open() const { return this->member.is_open(); } closeboost::iostreams::stream132 void close() { this->member.close(); } auto_closeboost::iostreams::stream133 bool auto_close() const { return this->member.auto_close(); } set_auto_closeboost::iostreams::stream134 void set_auto_close(bool close) { this->member.set_auto_close(close); } strict_syncboost::iostreams::stream135 bool strict_sync() { return this->member.strict_sync(); } operator *boost::iostreams::stream136 Device& operator*() { return *this->member; } operator ->boost::iostreams::stream137 Device* operator->() { return &*this->member; } componentboost::iostreams::stream138 Device* component() { return this->member.component(); } 139 private: open_implboost::iostreams::stream140 void open_impl(const Device& dev BOOST_IOSTREAMS_PUSH_PARAMS()) // For forwarding. 141 { 142 this->clear(); 143 this->member.open(dev BOOST_IOSTREAMS_PUSH_ARGS()); 144 } 145 }; 146 147 } } // End namespaces iostreams, boost. 148 149 #endif // #ifdef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION 150 151 #endif // #ifndef BOOST_IOSTREAMS_stream_HPP_INCLUDED 152