| # |
| # Check for bidirectional 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_BI_ITERATOR], |
| [AC_CACHE_CHECK(whether the compiler has the bidirectional iterator, |
| ac_cv_cxx_have_bi_iterator, |
| [AC_REQUIRE([AC_CXX_NAMESPACES]) |
| AC_LANG_SAVE |
| AC_LANG_CPLUSPLUS |
| AC_TRY_COMPILE([#include <iterator> |
| #ifdef HAVE_NAMESPACES |
| using namespace std; |
| #endif],[bidirectional_iterator<int,int> t; return 0;], |
| ac_cv_cxx_have_bi_iterator=yes, ac_cv_cxx_have_bi_iterator=no) |
| AC_LANG_RESTORE |
| ]) |
| HAVE_BI_ITERATOR=0 |
| if test "$ac_cv_cxx_have_bi_iterator" = yes |
| then |
| HAVE_BI_ITERATOR=1 |
| fi |
| AC_SUBST(HAVE_BI_ITERATOR)]) |