求助熟悉delphi的兄弟, Pascal 和C++的对应写法!

type
PPacket = ^TPacket;
TPacket = packed record
case Integer of
0: (b0, b1, b2, b3: Byte);
1: (i: Integer);
2: (a: array[0..3] of Byte);
3: (c: array[0..3] of Char);
end;
===================================
typedef union{
struct{
unsigned char b0;
unsigned char b1;
unsigned char b2;
unsigned char b3;
};
struct{
int i;
};
struct{
unsigned char a[4];
};
struct{
char c[4];
};
}TPacket,*PPacket;

typedef union{
struct{
unsigned char b0;
unsigned char b1;
unsigned char b2;
unsigned char b3;
};
int i;
unsigned char a[4];
char c[4];
}TPacket,*PPacket

多谢多谢各位!看了半天书，不如在这问一下，呵呵!