Macro: ac_cxx_mutable

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Synopsis

  `AC_CXX_MUTABLE`

Version

  1.1.1.1 (2001/07/26) C++_Support @ ac-archive-0.5.39

Author

  Luc Maisonobe

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.

M4 Source Code

      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
      ])