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   AC_CXX_HAVE_NUMERIC_LIMITS
  
If the compiler has numeric_limits<T>, define HAVE_NUMERIC_LIMITS.
http://autoconf-archive.cryp.to/ac_cxx_have_numeric_limits.m4
    Copyright © 2008 Todd Veldhuizen
    Copyright © 2008 Luc Maisonobe <luc@spaceroots.org>
   
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