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Autoconf Macro: ac_cxx_dynamic_cast
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<h1>
ac_cxx_dynamic_cast
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AC_CXX_DYNAMIC_CAST</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
If the compiler supports dynamic_cast<>, define HAVE_DYNAMIC_CAST.
</p>
</div>
<h2>
Authors
</h2>
<p class="indent">
Todd Veldhuizen and Luc Maisonobe <luc@spaceroots.org>.
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2004-02-04
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
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
])
</pre>
</div>
<h2>
License
</h2>
<div class="indent">
<span style="white-space:nowrap;">Copyright © 2004 Todd
Veldhuizen</span><br>
<span style="white-space:nowrap;">Copyright © 2004 Luc Maisonobe
<luc@spaceroots.org></span>
<p>
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.
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