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| 17:36.34 | coreyfarrell | rmudgett: if you have a minute could you help me understand something I just hit with the C preprocessor? apparently with '#define AST_HERE __FILE__, __LINE__, __PRETTY_FUNCTION__' another macro cannot use AST_HERE to represent 3 arguments. |
| 17:37.37 | coreyfarrell | so '#define INTERNAL_OBJ_CHECK(user_data) __INTERNAL_OBJ_CHECK(user_data, AST_HERE)' fails, says that __INTERNAL_OBJ_CHECK requires 4 arguments but was only given 2. |
| 17:39.37 | rmudgett | coreyfarrell: Well, apparently you cannot do that. :) |
| 17:40.00 | coreyfarrell | if __INTERNAL_OBJ_CHECK(user_data, AST_HERE) is used directly from a function it works as expected. seems to only be when 'AST_HERE' is used inside another macro. just surprises me because I thought arguments were pre-scanned / expanded. |
| 17:45.12 | rmudgett | ast_debug does something like that. |
| 17:46.38 | rmudgett | oh. it's doing that to a real function |
| 17:53.45 | coreyfarrell | rmudgett: ahh so a macro that expands to multiple arguments can only be passed directly to a real function. that still doesn't make sense per https://gcc.gnu.org/onlinedocs/cpp/Argument-Prescan.html but at least I know what does/doesn't work. |
| 17:55.13 | coreyfarrell | hmm in the bar(foo) example 'foo' is not being provided by a macro, it's being provided by "real" code (not explicitly said in the page but I understand that now). |
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