#include <iostream>
#include <string.h>
using namespace std;

struct MessageType1{
  unsigned long long bigData;
};

struct MessageType2{
  unsigned a:7;
  unsigned b:12;
};

union Message{
  MessageType1 messageBig;
  MessageType2 message1;
  unsigned long long uninterpreted;
};

unsigned long long sharedBuffer;

void send(void *buffer, unsigned int size){
  memcpy(&sharedBuffer, buffer, size);
}

Message receive(){
  Message m;
  m.uninterpreted = sharedBuffer;
  return m;
}

int main() {
  MessageType2 m1 = {'a', 3014};
  send(&m1, sizeof(m1));

  Message m = receive();
    cout<<(char)m.message1.a<<" "<<(unsigned int)m.message1.b<<endl;

    return 0;
}