xiaoxiang781216 commented on code in PR #20015:
URL: https://github.com/apache/nuttx/pull/20015#discussion_r3891107928
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include/nuttx/macro.h:
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@@ -149,4 +149,61 @@
#define FOREACH_ARG(action, param, ...) \
FOREACH_ARG_(action, GET_ARG_COUNT(__VA_ARGS__), param, ##__VA_ARGS__)
+/* Apply the macro to each argument, passing the position of the argument
+ * as a two digit literal (00, 01, 02, ...) rather than as an expression.
+ * Use it when the index has to be pasted into an identifier, for instance
+ * to build a symbol name the linker can sort. The arguments are reversed
+ * before the expansion, so the actions are emitted from the last argument
+ * to the first while the indexes still follow the original order, which is
+ * transparent for the declarations this form is meant to generate.
+ */
+
+#define FOREACH_IDX_0(action, param, ...)
Review Comment:
could we modify FOREACH_ARG directly
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