autoconf/m4/cxx_fwd_iterator.m4

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