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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_cxx_const_cast.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_CONST_CAST
#
# DESCRIPTION
#
# If the compiler supports const_cast<>, define HAVE_CONST_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_CONST_CAST], [AX_CXX_CONST_CAST])
AC_DEFUN([AX_CXX_CONST_CAST],
[dnl
AC_CACHE_CHECK([whether the compiler supports const_cast<>],
ax_cv_cxx_const_cast,
[dnl
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([dnl
AC_LANG_PROGRAM([],
[int x = 0;
const int& y = x;
int& z = const_cast<int&>(y);
return z;])],
ax_cv_cxx_const_cast=yes,
ax_cv_cxx_const_cast=no)
AC_LANG_POP([C++])
])
AS_IF([test "X$ax_cv_cxx_const_cast" = Xyes],
[AC_DEFINE(HAVE_CONST_CAST,,[define if the compiler supports const_cast<>])])
])
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