Write code:

//////////////////

#define ARGS_AMOUNT 9

#define INTERNAL_GENERATE_MEMBER_APPLY_CLASS(_, ARG_COUNTER, MemberName)\

  template<class TClassWithMember BOOST_PP_COMMA_IF(ARG_COUNTER) BOOST_PP_ENUM_PARAMS(ARG_COUNTER, class TArg)>\

  result_type operator()(\

    TClassWithMember& classWithMember BOOST_PP_COMMA_IF(ARG_COUNTER)\

    BOOST_PP_ENUM_BINARY_PARAMS(ARG_COUNTER, TArg, &arg)) const\

    {\

       classWithMember.MemberName(BOOST_PP_ENUM_PARAMS(ARG_COUNTER, arg));\

    }

#define DECLARE_MEMBER_APPLY_CLASS(TMemberApplyClassName, MemberName)\

  template<class TResultType>\

  struct TMemberApplyClassName\

  {\

     typedef TResultType result_type;\

     BOOST_PP_REPEAT(ARGS_AMOUNT, INTERNAL_GENERATE_MEMBER_APPLY_CLASS, MemberName)\

  };

#undef ARGS_AMOUNT

//////////////////

DECLARE_MEMBER_APPLY_CLASS(TClassName, MemberName) declare class template closer to boost::apply, but my declared class call member MemberName: f.MemberName(args...); opposite f.operator()(args...) at boost::apply.

Code not work correctly, because ARGS_AMOUNT not replaced to number 9 internally. ARGS_AMOUNT preserved after all macros substitution.

If manualy replace text "ARGS_AMOUNT" at "call" for BOOST_PP_REPEAT in macros DECLARE_MEMBER_APPLY_CLASS to 9, then code generated and work correctly.

Why it does? How preserve valuable name of const ARGS_AMOUNT? 

Now temporarily maualy replace ARGS_AMOUNT to 9 and write comment about this hardcoded const 9:

BOOST_PP_REPEAT(9 /*max amount of arguments for MemberName*/, INTERNAL_GENERATE_MEMBER_APPLY_CLASS, MemberName)\