msg.v2

      ver           = 0;        //proto format parse version.

#include "msg.v1"

struct msg(magic=0xffaabb,ver=2){

  
  //type
  bool _b;
  u08 a(0:at_undefined, 1:at_well, 2:at_bad; at_bad);
  i08 b;
  u16 c;
  i16 d;
  u32 e;
  i32 f;
  u64 g;
  i64 h;
  float i;
  double j;
  string n; //can use vector<char> replace it.
  
  ssss s0;
  u32 o[100];

  struct subst{
    u32 a;
    vector<string> v;
  };
  
  //struct
  vector<u32> va;
  vector<vector<u32>> vvu;
  map<u32,map<string,u64>> mmu;
  deque<u32>  qa;
  list<u32>   la;
  set<u32>    sa;
  list<vector<u32>> lvu;
  map<u32, string> ma;
  mset<string> ms;
  mmap<u32, string> mm;
  vector<map<string,list<subst>>> ccn;
  
  struct ssss{
    string abc;
    string arr[100];
  };
  vector<ssss> vsss;
  ssss        s256[256];
  u32 iga;

  vector<map<u32,map<float,map<string,subst>>>> xxxx;
};