| dnl $Id: ac_cxx_have_mutable.m4,v 1.2 2004/04/23 23:41:52 opetzold Exp $ |
| dnl |
| dnl If the compiler allows modifying data members of classes flagged with |
| dnl the mutable keyword even in const objects, define HAVE_MUTABLE. |
| dnl |
| |
| AC_DEFUN([AC_CXX_HAVE_MUTABLE], |
| [AC_CACHE_CHECK(for mutable, |
| ac_cv_cxx_mutable, |
| [AC_LANG_PUSH([C++]) |
| AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ |
| class Foo { |
| mutable int i; |
| public: |
| int bar (int n) const { i = n; return i; } |
| }; |
| ]], [[Foo foo; return foo.bar(1);]])],[ac_cv_cxx_mutable=yes],[ac_cv_cxx_mutable=no]) |
| AC_LANG_POP([C++]) |
| ]) |
| if test "$ac_cv_cxx_mutable" = yes; then |
| AC_DEFINE(HAVE_MUTABLE,,[Define if the compiler supports the mutable keyword]) |
| fi |
| ]) |
