| # |
| # 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_PUSH([C++]) |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#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_POP([C++]) |
| ]) |
| if test "$ac_cv_cxx_have_bi_iterator" = yes |
| then |
| AC_DEFINE(HAVE_BI_ITERATOR,1,[Have bi-directional iterator]) |
| else |
| AC_DEFINE(HAVE_BI_ITERATOR,0,[Does not have bi-directional iterator]) |
| fi |
| ]) |
