Add M_FILTER and M_FILTER_C macros (src, tests, doc)

tests/test-mcore.c

@@ -305,10 +305,21 @@ static void test_list(void)
   assert(M_KEEP_ARGS(1, 1, 0, 0, 0, 0));
   assert(M_SKIP_ARGS(4, 0, 0, 0, 0, 1));
   assert(M_MID_ARGS(2, 1, 0, 0, 1, 0));
+
   const int tab[] = { M_REPLICATE_C(5, 1) };
   for(int i = 0; i < 5; i++) assert(tab[i] == 1);
   const char str[] = M_REPLICATE(10, "N");
   assert(strcmp(str, "NNNNNNNNNN") == 0);
+
+  assert(M_EQUAL(M_REMOVE_PARENTHESIS( 17 ), 17));
+  assert(M_EQUAL(M_REMOVE_PARENTHESIS( (17) ), 17));
+
+  assert( M_FILTER(M_EQUAL, 17, 1, 42, 17, 89) );
+  assert( M_FILTER_C(M_EQUAL, 17, 1, 42, 17, 89) );
+  const int tab2[] = { M_FILTER_C(M_NOTEQUAL, 8, 1, 3, 4, 8, 9, 8, 10) };
+  const int tabref[] = { 1, 3, 4, 9, 10 };
+  assert (sizeof tab2 == sizeof tabref);
+  for(int i = 0; i < 5 ; i++) assert(tab2[i] == tabref[i]);
 }
 
 static void test_oplist(void)