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# ============================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_reinterpret_cast.html
# ============================================================================
#
# SYNOPSIS
#
# AX_CXX_REINTERPRET_CAST
#
# DESCRIPTION
#
# If the compiler supports reinterpret_cast<>, define
# HAVE_REINTERPRET_CAST.
#
# LICENSE
#
# Copyright (c) 2008 Todd Veldhuizen
# Copyright (c) 2008 Luc Maisonobe <luc@spaceroots.org>
#
# 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. This file is offered as-is, without any
# warranty.
#serial 8
AU_ALIAS([AC_CXX_REINTERPRET_CAST], [AX_CXX_REINTERPRET_CAST])
AC_DEFUN([AX_CXX_REINTERPRET_CAST],
[AC_CACHE_CHECK(whether the compiler supports reinterpret_cast<>,
ax_cv_cxx_reinterpret_cast,
[AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <typeinfo>
class Base { public : Base () {} virtual void f () = 0;};
class Derived : public Base { public : Derived () {} virtual void f () {} };
class Unrelated { public : Unrelated () {} };
int g (Unrelated&) { return 0; }]], [[
Derived d;Base& b=d;Unrelated& e=reinterpret_cast<Unrelated&>(b);return g(e);]])],
[ax_cv_cxx_reinterpret_cast=yes], [ax_cv_cxx_reinterpret_cast=no])
AC_LANG_POP([C++])
])
if test "$ax_cv_cxx_reinterpret_cast" = yes; then
AC_DEFINE(HAVE_REINTERPRET_CAST,,
[define if the compiler supports reinterpret_cast<>])
fi
])
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