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_PUSH([C++])
  10   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iterator>
  11 #ifdef HAVE_NAMESPACES
  12 using namespace std;
  13 #endif]], [[bidirectional_iterator<int,int> t; return 0;]])],[ac_cv_cxx_have_bi_iterator=yes],[ac_cv_cxx_have_bi_iterator=no])
  14   AC_LANG_POP([C++])
  15 ])
  16 if test "$ac_cv_cxx_have_bi_iterator" = yes
  17 then
  18   AC_DEFINE(HAVE_BI_ITERATOR,1,[Have bi-directional iterator])
  19 else
  20   AC_DEFINE(HAVE_BI_ITERATOR,0,[Does not have bi-directional iterator])
  21 fi
  22 ])