Update comments & avoid using M_ID for internal macros

m-core.h

@@ -1328,7 +1328,6 @@ M_BEGIN_PROTECTED_CODE
    NOTE: Increase number of arguments to 76 due to the number of available methods.
    NOTE: Rewrite with another approach much more verbose but also much faster for the compiler.
    This kind of approach seems ugly, but is in fact the fast one.
-   NOTE: Do not call recursively the macro (example: M_MAP2B_10 expands f(d,e) then call M_MAP2B_9 on what remains to break as soon as possible the macro "chain".
    Generated by the following command:
    for i in $(seq 1 52) ; do printf "#define M_MAP2B_%d(f, d" $i ; for j in $(seq 1 $i) ; do printf ", _%d" $j ; done ; printf ") " ; for j in $(seq 1 $i) ; do printf "f(d, _%d) " $j ; done ; printf "\n"; done
 */
@@ -1668,18 +1667,23 @@ M_BEGIN_PROTECTED_CODE
 #define M_REDUCEI3_52(f,g,d,_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) g(f(d, 1, _1), g(f(d, 2, _2), g(f(d, 3, _3), g(f(d, 4, _4), g(f(d, 5, _5), g(f(d, 6, _6), g(f(d, 7, _7), g(f(d, 8, _8), g(f(d, 9, _9), g(f(d, 10, _10), g(f(d, 11, _11), g(f(d, 12, _12), g(f(d, 13, _13), g(f(d, 14, _14), g(f(d, 15, _15), g(f(d, 16, _16), g(f(d, 17, _17), g(f(d, 18, _18), g(f(d, 19, _19), g(f(d, 20, _20), g(f(d, 21, _21), g(f(d, 22, _22), g(f(d, 23, _23), g(f(d, 24, _24), g(f(d, 25, _25), g(f(d, 26, _26), g(f(d, 27, _27), g(f(d, 28, _28), g(f(d, 29, _29), g(f(d, 30, _30), g(f(d, 31, _31), g(f(d, 32, _32), g(f(d, 33, _33), g(f(d, 34, _34), g(f(d, 35, _35), g(f(d, 36, _36), g(f(d, 37, _37), g(f(d, 38, _38), g(f(d, 39, _39), g(f(d, 40, _40), g(f(d, 41, _41), g(f(d, 42, _42), g(f(d, 43, _43), g(f(d, 44, _44), g(f(d, 45, _45), g(f(d, 46, _46), g(f(d, 47, _47), g(f(d, 48, _48), g(f(d, 49, _49), g(f(d, 50, _50), g(f(d, 51, _51), f(d, 52, _52))))))))))))))))))))))))))))))))))))))))))))))))))))
 
 
-/* M_MAP_C(f, a, b, c) ==> f(a), f(b), f(c) */
-#define M_MAP_C(f, ...)   M_REDUCE(f, M_ID, __VA_ARGS__)
+/* Like M_MAP but with a comma separator.
+   M_MAP_C(f, a, b, c) ==> f(a), f(b), f(c) */
+#define M_MAP_C(f, ...)       M_REDUCE(f, M_MAP_C_ID, __VA_ARGS__)
+#define M_MAP_C_ID(...)       __VA_ARGS__
 
-/* M_MAP2_C(f, d, a, b, c) ==> f(d, a), f(d, b), f(d, c) */
+/* Like M_MAP2 but with a comma separator.
+   M_MAP2_C(f, d, a, b, c) ==> f(d, a), f(d, b), f(d, c) */
 #define M_MAP2_C(f, d, ...)   M_REDUCE2(f, M_MAP2_C_ID, d, __VA_ARGS__)
 #define M_MAP2_C_ID(...)      __VA_ARGS__
 
-/* M_MAP3_C(f, d, a, b, c) ==> f(d, a), f(d, b), f(d, c) */
+/* Like M_MAP3 but with a comma separator.
+   M_MAP3_C(f, d, a, b, c) ==> f(d, 1, a), f(d, 2, b), f(d, 3, c) */
 #define M_MAP3_C(f, d, ...)   M_REDUCE3(f, M_MAP3_C_ID, d, __VA_ARGS__)
 #define M_MAP3_C_ID(...)      __VA_ARGS__
 
 
+
 /* Sequence of numerical */
 /* Example: 
    M_SEQ(init,end)==>init, init+1, ...end