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