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# Check for C++ namespace support. This is from
# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_namespaces.html
#
AC_DEFUN([AC_CXX_NAMESPACES],
[AC_CACHE_CHECK(whether the compiler implements namespaces,
ac_cv_cxx_namespaces,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[namespace Outer { namespace Inner { int i = 0; }}]],
[[using namespace Outer::Inner; return i;]])],
ac_cv_cxx_namespaces=yes,
ac_cv_cxx_namespaces=no)
AC_LANG_POP([C++])
])
if test "$ac_cv_cxx_namespaces" = yes; then
AC_DEFINE(HAVE_NAMESPACES,,[define if the compiler implements namespaces])
fi
])
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