Short hand expression operators

[Philip Herron]

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Hey guys

I was just thinking until now in my language i haven't allowed
operators like '++' or '+=' etc. Though in the Lex and Yacc book i
took the example of using:

'-' express %prec UMINUS

inline with my usual:

exp '+' exp etc, so this allows '-2 + x' and the like. Which i guess
is half way to allowing: x++ or x-- or x+=2 and the nice short hand
operators.

Would be nice if you could point me in the right direction of how to
handle the grammar of these kinds of operators.

Thanks

- --Phil
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