21 lines
713 B
Plaintext
21 lines
713 B
Plaintext
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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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