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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