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m4/ac_cxx_have_numeric_limits.m4

 

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dnl Available from the GNU Autoconf Macro Archive at:

 

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dnl http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_numeric_limits.html

 

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dnl

 

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AC_DEFUN([AC_CXX_HAVE_NUMERIC_LIMITS],

 

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[AC_CACHE_CHECK(whether the compiler has numeric_limits<T>,

 

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ac_cv_cxx_have_numeric_limits,

 

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[AC_REQUIRE([AC_CXX_NAMESPACES])

 

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 AC_LANG_SAVE

 

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 AC_LANG_CPLUSPLUS

 

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 AC_TRY_COMPILE([#include <limits>

 

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#ifdef HAVE_NAMESPACES

 

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using namespace std;

 

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#endif],[double e = numeric_limits<double>::epsilon(); return 0;],

 

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 ac_cv_cxx_have_numeric_limits=yes, ac_cv_cxx_have_numeric_limits=no)

 

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 AC_LANG_RESTORE

 

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])

 

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if test "$ac_cv_cxx_have_numeric_limits" = yes; then

 

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  AC_DEFINE(HAVE_NUMERIC_LIMITS,,[define if the compiler has numeric_limits<T>])

 

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fi

 

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])

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