| 1 | // ---------------------------------------------------------------------------- |
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| 2 | // compat_workarounds : general framework for non-conformance workarounds |
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| 3 | // ---------------------------------------------------------------------------- |
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| 4 | |
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| 5 | // Copyright Samuel Krempp 2003. Use, modification, and distribution are |
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| 6 | // subject to the Boost Software License, Version 1.0. (See accompanying |
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| 7 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 8 | |
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| 9 | // see http://www.boost.org/libs/format for library home page |
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| 10 | |
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| 11 | // ---------------------------------------------------------------------------- |
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| 12 | |
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| 13 | |
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| 14 | // this file defines wrapper classes to hide non-conforming |
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| 15 | // std::char_traits<> and std::allocator<> traits |
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| 16 | // and Includes : config_macros.hpp (defines config macros |
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| 17 | // and compiler-specific switches) |
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| 18 | |
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| 19 | // Non-conformant Std-libs fail to supply conformant traits (std::char_traits, |
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| 20 | // std::allocator) and/or the std::string doesnt support them. |
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| 21 | // We don't want to have hundreds of #ifdef workarounds, so we define |
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| 22 | // replacement traits. |
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| 23 | // But both char_traits and allocator traits are visible in the interface, |
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| 24 | // (inside the final string type), thus we need to keep both |
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| 25 | // the replacement type (typedefed to 'compatible_type') for real use, |
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| 26 | // and the original stdlib type (typedef to 'type_for_string') for interface |
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| 27 | // visibility. This is what Compat* classes do (as well as be transparent |
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| 28 | // when good allocator and char traits are present) |
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| 29 | |
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| 30 | #ifndef BOOST_FORMAT_COMPAT_WORKAROUNDS_HPP |
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| 31 | #define BOOST_FORMAT_COMPAT_WORKAROUNDS_HPP |
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| 32 | |
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| 33 | namespace boost { |
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| 34 | namespace io { |
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| 35 | |
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| 36 | // gcc-2.95 char traits (non-conformantly named string_char_traits) |
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| 37 | // lack several functions so we extend them in a replacement class. |
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| 38 | template<class Tr> |
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| 39 | class CompatTraits; |
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| 40 | |
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| 41 | // std::allocator<Ch> in gcc-2.95 is ok, but basic_string only works |
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| 42 | // with plain 'std::alloc' still, alt_stringbuf requires a functionnal |
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| 43 | // alloc template argument, so we need a replacement allocator |
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| 44 | template<class Alloc> |
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| 45 | class CompatAlloc; |
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| 46 | } // N.S. io |
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| 47 | }// N.S. boost |
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| 48 | |
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| 49 | |
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| 50 | #include <boost/format/detail/config_macros.hpp> |
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| 51 | // sets-up macros and load compiler-specific workarounds headers. |
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| 52 | |
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| 53 | #if !defined(BOOST_FORMAT_STREAMBUF_DEFINED) |
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| 54 | // workarounds-gcc-2.95 might have defined own streambuf |
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| 55 | #include <streambuf> |
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| 56 | #endif |
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| 57 | |
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| 58 | #if !defined(BOOST_FORMAT_OSTREAM_DEFINED) |
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| 59 | // workarounds-gcc-2.95 might already have included <iostream> |
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| 60 | #include <ostream> |
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| 61 | #endif |
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| 62 | |
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| 63 | |
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| 64 | |
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| 65 | namespace boost { |
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| 66 | namespace io { |
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| 67 | |
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| 68 | // **** CompatTraits general definitions : ---------------------------- |
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| 69 | template<class Tr> |
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| 70 | class CompatTraits |
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| 71 | { // general case : be transparent |
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| 72 | public: |
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| 73 | typedef Tr compatible_type; |
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| 74 | }; |
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| 75 | |
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| 76 | // **** CompatAlloc general definitions : ----------------------------- |
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| 77 | template<class Alloc> |
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| 78 | class CompatAlloc |
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| 79 | { // general case : be transparent |
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| 80 | public: |
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| 81 | typedef Alloc compatible_type; |
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| 82 | }; |
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| 83 | |
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| 84 | } //N.S. io |
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| 85 | } // N.S. boost |
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| 86 | #endif // include guard |
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| 87 | |
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