ac_cxx_member_constants

If the compiler supports member constants, define HAVE_MEMBER_CONSTANTS.

AC_DEFUN([AC_CXX_MEMBER_CONSTANTS],
[AC_CACHE_CHECK(whether the compiler supports member constants,
ac_cv_cxx_member_constants,
[AC_LANG_SAVE
 AC_LANG_CPLUSPLUS
 AC_TRY_COMPILE([class C {public: static const int i = 0;}; const int C::i;],
[return C::i;],
 ac_cv_cxx_member_constants=yes, ac_cv_cxx_member_constants=no)
 AC_LANG_RESTORE
])
if test "$ac_cv_cxx_member_constants" = yes; then
  AC_DEFINE(HAVE_MEMBER_CONSTANTS,,[define if the compiler supports member constants])
fi
])