]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
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 |