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AC_CXX_MUTABLE
1.2 (2004/02/15) 0.5.57 : C++_Support
Todd Veldhuizen and Luc Maisonobe <luc@spaceroots.org>
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.
AC_DEFUN([AC_CXX_MUTABLE],
[AC_CACHE_CHECK(whether the compiler supports the mutable keyword,
ac_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);],
ac_cv_cxx_mutable=yes, ac_cv_cxx_mutable=no)
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_mutable" = yes; then
AC_DEFINE(HAVE_MUTABLE,,[define if the compiler supports the mutable keyword])
fi
])