20 lines
736 B
Plaintext
20 lines
736 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_dynamic_cast.html
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dnl
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AC_DEFUN([AC_CXX_DYNAMIC_CAST],
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[AC_CACHE_CHECK(whether the compiler supports dynamic_cast<>,
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ac_cv_cxx_dynamic_cast,
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[AC_LANG_SAVE
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AC_LANG_CPLUSPLUS
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AC_TRY_COMPILE([#include <typeinfo>
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class Base { public : Base () {} virtual void f () = 0;};
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class Derived : public Base { public : Derived () {} virtual void f () {} };],[
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Derived d; Base& b=d; return dynamic_cast<Derived*>(&b) ? 0 : 1;],
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ac_cv_cxx_dynamic_cast=yes, ac_cv_cxx_dynamic_cast=no)
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AC_LANG_RESTORE
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])
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if test "$ac_cv_cxx_dynamic_cast" = yes; then
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AC_DEFINE(HAVE_DYNAMIC_CAST,,[define if the compiler supports dynamic_cast<>])
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fi
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])
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