This post is used to record one mistake while my coding – just for my bad memory:) I have to admit that it spent me the whole day to figure out what was wrong, as it looked prefect except parse error during compiling. At least 2 things are revealed: 1, I suck on C; 2, I need to learn compiler theory…

#include <stdio.h>
#include <stdlib.h>

typedef struct _Big{
 char big;
 int bigInt;
}Big;

typedef struct _Bigger{
 char bigger;
 Big *bigP;
}Bigger;

typedef struct _Biggest{
 char biggest;
 Bigger *biggerP;
}Biggest;

#define GET_BIG( _biggestP) 
 ((_biggestP)->biggerP->bigP)

#define BIGINT_IS_ONE( _biggestP, _bigInt) 
 ( 1 == GET_BIG( _biggestP)->(_bigInt))
 // daveti: insane happens here, like 'xxx->(xxx)'

int main(void)
{
 Biggest *bP = calloc( 1, sizeof( Biggest));
 bP->biggerP = calloc( 1, sizeof( Bigger));
 bP->biggerP->bigP = calloc( 1, sizeof( Big));

 bP->biggerP->bigP->bigInt = 2;
 printf( "i = %sn"
 ,( BIGINT_IS_ONE( bP, bigInt) ? "one" : "not one")
 );

 return 0;
}