comparison DEPENDENCIES/generic/include/boost/iostreams/detail/adapter/direct_adapter.hpp @ 16:2665513ce2d3

Add boost headers

+// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
+// (C) Copyright 2003-2007 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_DETAIL_DIRECT_ADAPTER_HPP_INCLUDED
+#define BOOST_IOSTREAMS_DETAIL_DIRECT_ADAPTER_HPP_INCLUDED
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif              
+
+#include <boost/config.hpp>       // SFINAE, MSVC, put ptrdiff_t in std.
+#include <algorithm>              // copy, min.
+#include <cstddef>                // ptrdiff_t.
+#include <boost/detail/workaround.hpp>
+#include <boost/iostreams/categories.hpp>
+#include <boost/iostreams/detail/config/limits.hpp>        // forwarding.
+#include <boost/iostreams/detail/config/wide_streams.hpp>  // locale.
+#include <boost/iostreams/detail/double_object.hpp>
+#include <boost/iostreams/detail/error.hpp>
+#include <boost/iostreams/detail/ios.hpp>  // openmode, seekdir, int types.
+#include <boost/iostreams/traits.hpp>      // mode_of, is_direct.
+#include <boost/iostreams/operations.hpp>
+#include <boost/mpl/bool.hpp> 
+#include <boost/mpl/or.hpp> 
+#include <boost/preprocessor/iteration/local.hpp>
+#include <boost/preprocessor/repetition/enum_binary_params.hpp>
+#include <boost/preprocessor/repetition/enum_params.hpp>
+#include <boost/static_assert.hpp>
+#include <boost/throw_exception.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+
+// Must come last.
+#include <boost/iostreams/detail/config/disable_warnings.hpp> // VC7.1
+
+namespace boost { namespace iostreams { namespace detail {
+                    
+//------------------Definition of direct_adapter_base-------------------------//
+
+// Put all initialization in base class to faciliate forwarding.
+template<typename Direct>
+class direct_adapter_base {
+public:
+    typedef typename char_type_of<Direct>::type  char_type;
+    typedef typename mode_of<Direct>::type       mode_type;
+    struct category 
+        : mode_type,
+          device_tag,
+          closable_tag
+          #ifndef BOOST_IOSTREAMS_NO_LOCALE
+          , localizable_tag
+          #endif
+        { };
+protected:
+    explicit direct_adapter_base(const Direct& d);
+    typedef is_convertible<category, two_sequence> is_double;
+    struct pointers {
+        char_type *beg, *ptr, *end;
+    };
+    void init_input(mpl::true_);
+    void init_input(mpl::false_) { }
+    void init_output(mpl::true_);
+    void init_output(mpl::false_) { }
+    double_object<pointers, is_double>  ptrs_;
+    Direct                              d_;
+};
+
+template<typename Direct>
+class direct_adapter : private direct_adapter_base<Direct> {
+private:
+    typedef direct_adapter_base<Direct>      base_type;
+    typedef typename base_type::pointers     pointers;
+    typedef typename base_type::is_double    is_double;
+    using base_type::ptrs_;
+    using base_type::d_;
+public:
+    typedef typename base_type::char_type    char_type;
+    typedef typename base_type::category     category;
+
+        // Constructors
+
+#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1310)
+    direct_adapter(const Direct& d) : base_type(d) { }   
+    direct_adapter(const direct_adapter& d) : base_type(d) { }
+# define BOOST_PP_LOCAL_LIMITS (1, BOOST_IOSTREAMS_MAX_FORWARDING_ARITY)
+#else
+    template<typename U>
+    struct is_direct
+        : mpl::or_< 
+              is_same<U, direct_adapter<Direct> >, 
+              is_same<U, Direct> 
+          >
+        { };
+    template<typename U>
+    direct_adapter(const U& u) 
+        : base_type(forward(u, is_direct<U>()))
+        { }
+# define BOOST_PP_LOCAL_LIMITS (2, BOOST_IOSTREAMS_MAX_FORWARDING_ARITY)
+#endif
+
+#define BOOST_PP_LOCAL_MACRO(n) \
+    template<BOOST_PP_ENUM_PARAMS(n, typename P)> \
+    direct_adapter(BOOST_PP_ENUM_BINARY_PARAMS(n, const P, &p)) \
+        : base_type(Direct(BOOST_PP_ENUM_PARAMS(n, p))) \
+        { } \
+    /**/
+#include BOOST_PP_LOCAL_ITERATE()
+#undef BOOST_PP_LOCAL_MACRO
+
+        // Device interface.
+
+    std::streamsize read(char_type* s, std::streamsize n);
+    std::streamsize write(const char_type* s, std::streamsize n);
+    std::streampos seek( stream_offset, BOOST_IOS::seekdir,
+                         BOOST_IOS::openmode = BOOST_IOS::in | BOOST_IOS::out );
+    void close();
+    void close(BOOST_IOS::openmode which);
+#ifndef BOOST_IOSTREAMS_NO_LOCALE
+    void imbue(const std::locale&);
+#endif
+
+        // Direct device access.
+
+    Direct& operator*() { return d_; }
+    Direct* operator->() { return &d_; }
+#if BOOST_WORKAROUND(BOOST_MSVC, <= 1310)
+private:
+    template<typename U>
+    static Direct forward(const U& u, mpl::true_) { return u; }
+    template<typename U>
+    static Direct forward(const U& u, mpl::false_) { return Direct(u); }
+#endif
+};
+
+//--------------Definition of wrap_direct and unwrap_direct-------------------//
+
+template<typename Device>
+struct wrap_direct_traits 
+    : mpl::if_<
+          is_direct<Device>,
+          direct_adapter<Device>,
+          Device
+      >
+    { };
+
+template<typename Device>
+typename wrap_direct_traits<Device>::type
+inline wrap_direct(Device dev) 
+{ 
+    typedef typename wrap_direct_traits<Device>::type type;
+    return type(dev); 
+}
+
+template<typename Device>
+inline Device& unwrap_direct(Device& d) { return d; }  
+
+template<typename Device>
+inline Device& unwrap_direct(direct_adapter<Device>& d) { return *d; }  
+
+//--------------Implementation of direct_adapter_base-------------------------//
+
+template<typename Direct>
+direct_adapter_base<Direct>::direct_adapter_base(const Direct& d) : d_(d)
+{
+    init_input(is_convertible<category, input>());
+    init_output(is_convertible<category, output>());
+}
+
+template<typename Direct>
+void direct_adapter_base<Direct>::init_input(mpl::true_) 
+{
+    std::pair<char_type*, char_type*> seq = iostreams::input_sequence(d_);
+    ptrs_.first().beg = seq.first;
+    ptrs_.first().ptr = seq.first;
+    ptrs_.first().end = seq.second;
+}
+
+template<typename Direct>
+void direct_adapter_base<Direct>::init_output(mpl::true_) 
+{
+    std::pair<char_type*, char_type*> seq = iostreams::output_sequence(d_);
+    ptrs_.second().beg = seq.first;
+    ptrs_.second().ptr = seq.first;
+    ptrs_.second().end = seq.second;
+}
+
+//--------------Implementation of direct_adapter------------------------------//
+
+template<typename Direct>
+inline std::streamsize direct_adapter<Direct>::read
+    (char_type* s, std::streamsize n)
+{
+    using namespace std;
+    pointers& get = ptrs_.first();
+    std::streamsize avail = 
+        static_cast<std::streamsize>(get.end - get.ptr);
+    std::streamsize result = (std::min)(n, avail);
+    std::copy(get.ptr, get.ptr + result, s);
+    get.ptr += result;
+    return result != 0 ? result : -1;
+}
+
+template<typename Direct>
+inline std::streamsize direct_adapter<Direct>::write
+    (const char_type* s, std::streamsize n)
+{
+    using namespace std;
+    pointers& put = ptrs_.second();
+    if (n > static_cast<std::streamsize>(put.end - put.ptr))
+        boost::throw_exception(write_area_exhausted());
+    std::copy(s, s + n, put.ptr);
+    put.ptr += n;
+    return n;
+}
+
+template<typename Direct>
+inline std::streampos direct_adapter<Direct>::seek
+    ( stream_offset off, BOOST_IOS::seekdir way, 
+      BOOST_IOS::openmode which )
+{
+    using namespace std;
+    pointers& get = ptrs_.first();
+    pointers& put = ptrs_.second();
+    if (way == BOOST_IOS::cur && get.ptr != put.ptr)
+       boost::throw_exception(bad_seek());
+    ptrdiff_t next = 0;
+    if ((which & BOOST_IOS::in) || !is_double::value) {
+        if (way == BOOST_IOS::beg)
+            next = off; 
+        else if (way == BOOST_IOS::cur)
+            next = get.ptr - get.beg + off; 
+        else
+            next = get.end - get.beg + off; 
+        if (next >= 0 && next <= get.end - get.beg)
+            get.ptr = get.beg + next;
+        else
+            boost::throw_exception(bad_seek());
+    }
+    if ((which & BOOST_IOS::out) && is_double::value) {
+        if (way == BOOST_IOS::beg)
+            next = off; 
+        else if (way == BOOST_IOS::cur)
+            next = put.ptr - put.beg + off; 
+        else
+            next = put.end - put.beg + off; 
+        if (next >= 0 && next <= put.end - put.beg)
+            put.ptr = put.beg + next;
+        else
+            boost::throw_exception(bad_seek());
+    }
+    return offset_to_position(next);
+}
+
+template<typename Direct>
+void direct_adapter<Direct>::close() 
+{ 
+    BOOST_STATIC_ASSERT((!is_convertible<category, two_sequence>::value));
+    detail::close_all(d_);
+}
+
+template<typename Direct>
+void direct_adapter<Direct>::close(BOOST_IOS::openmode which) 
+{ 
+    BOOST_STATIC_ASSERT((is_convertible<category, two_sequence>::value));
+    boost::iostreams::close(d_, which);
+}
+
+#ifndef BOOST_IOSTREAMS_NO_LOCALE
+    template<typename Direct>
+    void direct_adapter<Direct>::imbue(const std::locale& loc) 
+    { boost::iostreams::imbue(d_, loc); }
+#endif
+
+} } } // End namespaces detail, iostreams, boost.
+
+#include <boost/iostreams/detail/config/enable_warnings.hpp>
+
+#endif // #ifndef BOOST_IOSTREAMS_DETAIL_DIRECT_ADAPTER_HPP_INCLUDED