87 lines
3.0 KiB
C++
87 lines
3.0 KiB
C++
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// ----------------------------------------------------------------------------
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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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