C Macros

macros.c

#define LEN(A) (sizeof(A) / sizeof((A)[0]))
#define MIN(a, b) ((a) <= (b) ? (a) : (b))
// MAX3, MAX4, etc could be implented in terms of MAX, i.e. MAX((a), MAX((b), (c)))
#define MAX(a, b) ((a) >= (b) ? (a) : (b))
// C static assert
// if expr is true then evaluates sizeof(char[1])
// if expr is false then evaluates sizeof(char[-1]) which is undefined behavior
#define SASSERT(expr) ((void)sizeof(char[1 - 2 * !(expr)]))