Add macro arithmetic

Author: johnjohnlin

example.c

@@ -1,5 +1,4 @@
-/*
- * Compile with `gcc -E example.c` to see the preprocessor output.
+/* Compile with `gcc -E example.c` to see the preprocessor output.
  */
 #include "map.h"
 
@@ -26,10 +25,23 @@ MAP_UD(PRINT_STREAM, stderr, 1, 2, 3, 4, 5)
 /* Pass user-defined data to each list invocation */
 #define INVOKE(x, fun) fun(x)
 int arr [] = { MAP_LIST_UD(INVOKE, map, 1, 2, 3, 4, 5) };
-
+MAP_INC(1,2,3,4)
+MAP_INC(MAP_INC(1,2,3,4))
 /* Pass user-defined data and an index to each invocation */
 #define PRINT_STREAM_I(x, stream, index) fprintf (stream, "%d: %d\n", index, x);
-MAP_UD_I(PRINT_STREAM_I, stderr, 1, 2, 3, 4, 5)
+MAP_UD_I(PRINT_STREAM_I, stderr,
+	1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
+	11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
+	21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
+	31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
+	41, 42, 43, 44, 45, 46, 47, 48, 49, 50,
+	51, 52, 53, 54, 55, 56, 57, 58, 59, 60,
+	61, 62, 63, 64, 65, 66, 67, 68, 69, 70,
+	71, 72, 73, 74, 75, 76, 77, 78, 79, 80,
+	81, 82, 83, 84, 85, 86, 87, 88, 89, 90,
+	91, 92, 93, 94, 95, 96, 97, 98, 99, 100,
+	101, 102, 103, 104, 105, 106, 107, 108, 109
+)
 
 /* Pass user-defined data and an index to each list invocation */
 #define INVOKE_I(x, fun, index) fun(index, x)