2004-09-07 06:56:14 +00:00
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# Check for forward iterator extension. This is modified from
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# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_hash_set.html
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AC_DEFUN([AC_CXX_HAVE_FWD_ITERATOR],
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[AC_CACHE_CHECK(whether the compiler has forward iterators,
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ac_cv_cxx_have_fwd_iterator,
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[AC_REQUIRE([AC_CXX_NAMESPACES])
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2004-09-19 22:31:49 +00:00
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AC_LANG_PUSH([C++])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iterator>
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2004-09-07 06:56:14 +00:00
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#ifdef HAVE_NAMESPACES
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using namespace std;
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2004-09-19 22:31:49 +00:00
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#endif]], [[forward_iterator<int,int> t; return 0;]])],[ac_cv_cxx_have_fwd_iterator=yes],[ac_cv_cxx_have_fwd_iterator=no])
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AC_LANG_POP([C++])
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2004-09-07 06:56:14 +00:00
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])
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if test "$ac_cv_cxx_have_fwd_iterator" = yes
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then
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2004-09-24 21:19:06 +00:00
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AC_DEFINE(HAVE_FWD_ITERATOR,1,[Have forward iterator])
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else
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AC_DEFINE(HAVE_FWD_ITERATOR,0,[Does not have forward iterator])
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2004-09-07 06:56:14 +00:00
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fi
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2004-09-24 21:19:06 +00:00
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])
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2004-09-07 06:56:14 +00:00
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