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Message: [QUOTE="Victor Bazarov, post: 2549648"] I am fairly perplexed as to your statement about not finding this "case in the standard". Did you expect to find precisely this code or any other explanation to make this legal or not? Where in the Standard did you look? 'FOO' is replaced with 'foo' in the code _following_ the definition of 'FOO' macro. Once the preprocessor is done with the code, you get "void foo(int){}int main(){foo(0);return 0;}" (I left the spaces where needed to separate the preprocessor tokens). What's invalid about that code? And what is "object-like macro" you're referring to in your subject line? V [/QUOTE]