[boost] BOOST_SLIST_HEADER

From: Robert Ramey (ramey_at_[hidden])
Date: 2006-01-27 19:10:01

I've noticed that the following has been added to the 
config/stdlib/libstdcpp3.hpp

#if defined(__GLIBCXX__) || (defined(__GLIBCPP__) && __GLIBCPP__>=20020514) 
// GCC >= 3.1.0
#  define BOOST_STD_EXTENSION_NAMESPACE __gnu_cxx
#  define BOOST_HAS_SLIST
#  define BOOST_HAS_HASH
#  define BOOST_SLIST_HEADER <ext/slist>
#  define BOOST_HASH_SET_HEADER <ext/hash_set>
#  define BOOST_HASH_MAP_HEADER <ext/hash_map>
#endif

My question is: How is BOOST_SLIST_HEADER intended to be used.

At first I thought that one was expected to do something like the following:

#ifdef BOOST_HAS_SLIST
#include BOOST_SLIST_HEADER
#endif

But since BOOST_SLIST_HEADER is only defined in config/stdlib/libstdcpp3.hpp
other libraries that support define BOOST_HAS_SLIST.  On the otherhand
if one has to use:

#if defined(__GLIBCXX__) || (defined(__GLIBCPP__) && __GLIBCPP__>=20020514) 
// GCC >= 3.1.0

then whats point of defining BOOST_SLIST_HEADER  rather than just
using
#include <ext/slist>

What should I be doing here?

Robert Ramey