boost/iostreams/detail/char_traits.hpp

   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 // Provides std::char_traits for libraries without templated streams. Should not
   7 // be confused with <boost/iostreams/char_traits.hpp>, which defines the
   8 // template boost::iostreams::char_traits.
   9
  10 // See http://www.boost.org/libs/iostreams for documentation.
  11
  12 #ifndef BOOST_IOSTREAMS_DETAIL_CHAR_TRAITS_HPP_INCLUDED
  13 #define BOOST_IOSTREAMS_DETAIL_CHAR_TRAITS_HPP_INCLUDED
  14
  15 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
  16 # pragma once
  17 #endif
  18
  19 #include <iosfwd>
  20 #include <boost/iostreams/detail/config/wide_streams.hpp>
  21 #ifdef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES
  22 # include <boost/config.hpp> // Make sure size_t is in std.
  23 # include <cstddef>
  24 # include <cstring>
  25 # include <cstdio>
  26 #endif
  27
  28 #ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------------------//
  29 # define BOOST_IOSTREAMS_CHAR_TRAITS(ch) std::char_traits< ch >
  30 #else
  31 # define BOOST_IOSTREAMS_CHAR_TRAITS(ch) boost::iostreams::detail::char_traits
  32
  33 namespace boost { namespace iostreams { namespace detail {
  34
  35 struct char_traits  {
  36     typedef char            char_type;
  37     typedef int             int_type;
  38     typedef std::streampos  pos_type;
  39     typedef std::streamoff  off_type;
  40
  41     // Note: this may not be not conforming, since it treats chars as unsigned,
  42     // but is only used to test for equality.
  43     static int compare(const char* lhs, const char* rhs, std::size_t n)
  44     { return std::strncmp(lhs, rhs, n); }
  45     static char* copy(char *dest, const char *src, std::size_t n)
  46     { return static_cast<char*>(std::memcpy(dest, src, n)); }
  47     static char* move(char *dest, const char *src, std::size_t n)
  48     { return static_cast<char*>(std::memmove(dest, src, n)); }
  49     static const char* find(const char* s, std::size_t n, const char& c)
  50     { return (const char*) (const void*) std::memchr(s, c, n); }
  51     static char to_char_type(const int& c) { return c; }
  52     static int to_int_type(const char& c) { return c; }
  53     static bool eq_int_type(const int& lhs, const int& rhs)
  54     { return lhs == rhs; }
  55     static int eof() { return EOF; }
  56     static int not_eof(const int& c) { return c != EOF ? c : '\n'; }
  57 };
  58
  59 } } } // End namespaces detail, iostreams, boost.
  60
  61 #endif // #ifdef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-----------------------//
  62
  63 #endif // #ifndef BOOST_IOSTREAMS_DETAIL_CHAR_TRAITS_HPP_INCLUDED