source: NonGTP/Boost/boost/format/detail/compat_workarounds.hpp @ 857

Revision 857, 3.1 KB checked in by igarcia, 19 years ago (diff)
Line 
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
33namespace 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
65namespace 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
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