ceph/src/boost/libs/format/include/boost/format/detail/compat_workarounds.hpp

   1 // ----------------------------------------------------------------------------
   2 //  compat_workarounds : general framework for non-conformance workarounds
   3 // ----------------------------------------------------------------------------
   4
   5 //  Copyright Samuel Krempp 2003. Use, modification, and distribution are
   6 //  subject to the Boost Software License, Version 1.0. (See accompanying
   7 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   8
   9 // see http://www.boost.org/libs/format for library home page
  10
  11 // ----------------------------------------------------------------------------
  12
  13
  14 //  this file defines  wrapper classes to hide non-conforming
  15 // std::char_traits<>  and std::allocator<> traits
  16 //  and Includes : config_macros.hpp (defines config macros
  17 //  and compiler-specific switches)
  18
  19 // Non-conformant Std-libs fail to supply conformant traits (std::char_traits,
  20 //  std::allocator) and/or  the std::string doesnt support them.
  21 // We don't want to have hundreds of #ifdef workarounds, so we define
  22 // replacement traits.
  23 // But both char_traits and allocator traits are visible in the interface,
  24 // (inside the final string type),  thus we need to keep both
  25 // the replacement type (typedefed to 'compatible_type') for real use,
  26 // and the original stdlib type (typedef to 'type_for_string') for interface
  27 //  visibility. This is what Compat* classes do (as well as be transparent
  28 // when good allocator and char traits are present)
  29
  30 #ifndef BOOST_FORMAT_COMPAT_WORKAROUNDS_HPP
  31 #define BOOST_FORMAT_COMPAT_WORKAROUNDS_HPP
  32
  33 namespace boost {
  34     namespace io {
  35
  36         // gcc-2.95 char traits (non-conformantly named string_char_traits)
  37         // lack several functions so we extend them in a replacement class.
  38         template<class Tr>
  39         class CompatTraits;
  40
  41         // std::allocator<Ch> in gcc-2.95 is ok, but basic_string only works
  42         // with plain 'std::alloc' still, alt_stringbuf requires a functionnal
  43         // alloc template argument, so we need a replacement allocator
  44         template<class Alloc>
  45         class CompatAlloc;
  46     } // N.S. io
  47 }// N.S. boost
  48
  49
  50 #include <boost/format/detail/config_macros.hpp>
  51    // sets-up macros and load compiler-specific workarounds headers.
  52
  53 #if !defined(BOOST_FORMAT_STREAMBUF_DEFINED)
  54 // workarounds-gcc-2.95 might have defined own streambuf
  55 #include <streambuf>
  56 #endif
  57
  58 #if !defined(BOOST_FORMAT_OSTREAM_DEFINED)
  59 // workarounds-gcc-2.95 might already have included <iostream>
  60 #include <ostream>
  61 #endif
  62
  63
  64
  65 namespace boost {
  66     namespace io {
  67
  68         // **** CompatTraits general definitions : ----------------------------
  69         template<class Tr>
  70         class CompatTraits
  71         {        // general case : be transparent
  72         public:
  73             typedef Tr  compatible_type;
  74         };
  75
  76         // **** CompatAlloc general definitions : -----------------------------
  77         template<class Alloc>
  78         class CompatAlloc
  79         {        // general case : be transparent
  80         public:
  81             typedef Alloc  compatible_type;
  82         };
  83
  84     } //N.S. io
  85 } // N.S. boost
  86 #endif // include guard