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- // ----------------------------------------------------------------------------
- // compat_workarounds : general framework for non-conformance workarounds
- // ----------------------------------------------------------------------------
- // Copyright Samuel Krempp 2003. Use, modification, and distribution are
- // subject to the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- // see http://www.boost.org/libs/format for library home page
- // ----------------------------------------------------------------------------
- // this file defines wrapper classes to hide non-conforming
- // std::char_traits<> and std::allocator<> traits
- // and Includes : config_macros.hpp (defines config macros
- // and compiler-specific switches)
- // Non-conformant Std-libs fail to supply conformant traits (std::char_traits,
- // std::allocator) and/or the std::string doesnt support them.
- // We don't want to have hundreds of #ifdef workarounds, so we define
- // replacement traits.
- // But both char_traits and allocator traits are visible in the interface,
- // (inside the final string type), thus we need to keep both
- // the replacement type (typedefed to 'compatible_type') for real use,
- // and the original stdlib type (typedef to 'type_for_string') for interface
- // visibility. This is what Compat* classes do (as well as be transparent
- // when good allocator and char traits are present)
- #ifndef BOOST_FORMAT_COMPAT_WORKAROUNDS_HPP
- #define BOOST_FORMAT_COMPAT_WORKAROUNDS_HPP
- namespace boost {
- namespace io {
- // gcc-2.95 char traits (non-conformantly named string_char_traits)
- // lack several functions so we extend them in a replacement class.
- template<class Tr>
- class CompatTraits;
- // std::allocator<Ch> in gcc-2.95 is ok, but basic_string only works
- // with plain 'std::alloc' still, alt_stringbuf requires a functionnal
- // alloc template argument, so we need a replacement allocator
- template<class Alloc>
- class CompatAlloc;
- } // N.S. io
- }// N.S. boost
- #include <boost/format/detail/config_macros.hpp>
- // sets-up macros and load compiler-specific workarounds headers.
- #if !defined(BOOST_FORMAT_STREAMBUF_DEFINED)
- // workarounds-gcc-2.95 might have defined own streambuf
- #include <streambuf>
- #endif
- #if !defined(BOOST_FORMAT_OSTREAM_DEFINED)
- // workarounds-gcc-2.95 might already have included <iostream>
- #include <ostream>
- #endif
- namespace boost {
- namespace io {
- // **** CompatTraits general definitions : ----------------------------
- template<class Tr>
- class CompatTraits
- { // general case : be transparent
- public:
- typedef Tr compatible_type;
- };
- // **** CompatAlloc general definitions : -----------------------------
- template<class Alloc>
- class CompatAlloc
- { // general case : be transparent
- public:
- typedef Alloc compatible_type;
- };
- } //N.S. io
- } // N.S. boost
- #endif // include guard
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