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# https://www.gnu.org/software/autoconf-archive/ax_cxx_mutable.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_CXX_MUTABLE
#
# DESCRIPTION
#
# If the compiler allows modifying class data members flagged with the
# mutable keyword even in const objects (for example in the body of a
# const member function), define HAVE_MUTABLE.
#
# 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 7
AU_ALIAS([AC_CXX_MUTABLE], [AX_CXX_MUTABLE])
AC_DEFUN([AX_CXX_MUTABLE],
[AC_CACHE_CHECK(whether the compiler supports the mutable keyword,
ax_cv_cxx_mutable,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([
class A { mutable int i;
public:
int f (int n) const { i = n; return i; }
};
],[A a; return a.f (1);],
ax_cv_cxx_mutable=yes, ax_cv_cxx_mutable=no)
AC_LANG_RESTORE
])
if test "$ax_cv_cxx_mutable" = yes; then
AC_DEFINE(HAVE_MUTABLE,,[define if the compiler supports the mutable keyword])
fi
])
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