comparison DEPENDENCIES/generic/include/boost/iostreams/detail/vc6/read.hpp @ 16:2665513ce2d3

Add boost headers

+// (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.
+
+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)
+{
+    typedef typename detail::unwrapped_type<T>::type unwrapped;
+    return detail::read_device_impl<T>::inner<unwrapped>::get(detail::unwrap(t));
+}
+
+template<typename T>
+inline std::streamsize
+read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
+{
+    typedef typename detail::unwrapped_type<T>::type unwrapped;
+    return detail::read_device_impl<T>::inner<unwrapped>::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)
+{
+    typedef typename detail::unwrapped_type<T>::type unwrapped;
+    return detail::read_filter_impl<T>::inner<unwrapped>::read(detail::unwrap(t), src, s, n);
+}
+
+template<typename T>
+bool putback(T& t, typename char_type_of<T>::type c)
+{
+    typedef typename detail::unwrapped_type<T>::type unwrapped;
+    return detail::read_device_impl<T>::inner<unwrapped>::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& 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>
+    struct inner {
+        static typename int_type_of<T>::type get(T& t)
+        { return t.get(); }
+
+        static std::streamsize
+        read(T& t, typename char_type_of<T>::type* s, std::streamsize n)
+        { return check_eof(t.rdbuf()->sgetn(s, n)); }
+
+        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>
+    struct inner {
+        static typename int_type_of<T>::type
+        get(T& t)
+        {
+            typedef typename char_type_of<T>::type  char_type;
+            typedef 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();
+        }
+
+        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;
+        }
+
+        static bool putback(T& t, typename char_type_of<T>::type c)
+        {
+            typedef typename char_type_of<T>::type  char_type;
+            typedef char_traits<char_type>          traits_type;
+            return !traits_type::is_eof(t.sputbackc(c));
+        }
+    };
+};
+
+template<>
+struct read_device_impl<input> {
+    template<typename T>
+    struct inner {
+        static typename int_type_of<T>::type
+        get(T& t)
+        {
+            typedef typename char_type_of<T>::type  char_type;
+            typedef 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>
+    struct inner {
+        template<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>
+    struct inner {
+        template<typename Source>
+        static std::streamsize read
+            ( T& t, Source& src, typename char_type_of<T>::type* s, 
+              std::streamsize n )
+        {
+            typedef typename char_type_of<T>::type  char_type;
+            typedef 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.