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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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