AC_CXX_DYNAMIC_CAST
, 
, 

2004年02月04日

Todd Veldhuizen Luc Maisonobe <luc@spaceroots.org>

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Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. Users of this software should generally follow the principles of the MIT License includings its disclaimer.

cryp.to ac-archive's C++ Support (released)

If the compiler supports dynamic_cast<>, define HAVE_DYNAMIC_CAST.

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