autoconf/m4/cxx_bidi_iterator.m4

   1 #
   2 # Check for bidirectional iterator extension.  This is modified from
   3 # http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_hash_set.html
   4 #
   5 AC_DEFUN([AC_CXX_HAVE_BI_ITERATOR],
   6 [AC_CACHE_CHECK(whether the compiler has the bidirectional iterator,
   7 ac_cv_cxx_have_bi_iterator,
   8 [AC_REQUIRE([AC_CXX_NAMESPACES])
   9   AC_LANG_SAVE
  10   AC_LANG_CPLUSPLUS
  11   AC_TRY_COMPILE([#include <iterator>
  12 #ifdef HAVE_NAMESPACES
  13 using namespace std;
  14 #endif],[bidirectional_iterator<int,int> t; return 0;],
  15   ac_cv_cxx_have_bi_iterator=yes, ac_cv_cxx_have_bi_iterator=no)
  16   AC_LANG_RESTORE
  17 ])
  18 HAVE_BI_ITERATOR=0
  19 if test "$ac_cv_cxx_have_bi_iterator" = yes
  20 then
  21    HAVE_BI_ITERATOR=1
  22 fi
  23 AC_SUBST(HAVE_BI_ITERATOR)])