C Expressions

Can i do this in C?
int i = (1, 2); /* i gets the value of the last evaluated expression - that is 2 */
Is it allowed? my compiler does not complain.

The reason i am asking this is because i want to write a getopt in the form of a macro using #define.
In order for this to work like getopt(3) it needs to be maed of exprzionz

so yeah, is it a good idea to write a macro'd getopt()?
also, what about i = (1, 2)?

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