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# Check for forward iterator extension.  This is modified from
# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_hash_set.html
AC_DEFUN([AC_CXX_HAVE_FWD_ITERATOR],
[AC_CACHE_CHECK(whether the compiler has forward iterators,
ac_cv_cxx_have_fwd_iterator,
[AC_REQUIRE([AC_CXX_NAMESPACES])
  AC_LANG_PUSH([C++])
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iterator>
#ifdef HAVE_NAMESPACES
using namespace std;
#endif]], [[forward_iterator<int,int> t; return 0;]])],[ac_cv_cxx_have_fwd_iterator=yes],[ac_cv_cxx_have_fwd_iterator=no])
  AC_LANG_POP([C++])
])
if test "$ac_cv_cxx_have_fwd_iterator" = yes
then
   AC_DEFINE(HAVE_FWD_ITERATOR,1,[Have forward iterator])
else
   AC_DEFINE(HAVE_FWD_ITERATOR,0,[Does not have forward iterator])
fi
])