c++ - Can I make macro like `MACRO(x, Type1 t1, Type2 t2)` -

i want make code smaller. think macros make code smaller.
want make macro contains objects declarations.
there switch cases

    case sign_up:     {         std::string username;         std::string password         getargs(args, username, password);         sv.signup(username, password);     }     break;      case sign_in:     {         std::string username;         std::string password         getargs(args, username, password);         sv.signin(username, password);     }     break;      case something:     {         std::string s;         int i;         getargs(args, s, i);         sv.something(s, i);     }     break; 

i want make macro make code like

    case sign_up:         get_args(args, std::string username, std::string password);         sv.signup(username, password);         break;      case sign_in:         get_args(args, std::string username, std::string password);         sv.signin(username, password);         break;      case something:         get_args(args, std::string s, int i);         sv.something(s, i);         break; 

is possible?

you can use following macro:

#define get_args(args, firsttype, firstname, secondtype, secondname) \     firsttype firstname;\     secondtype secondname;\     getargs(args, firstname, secondname); 

not asked - little bit more writing required:

get_args(args, std::string, name, std::string, password); 

as can see have use more commas comparing you've asked for. me doesn't make difference, though.