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While looking into Can you have a incrementor and a decrementor on the same variable in the same statement in c
I discovered that you can have several prefix increment/decrement operators on a single variable, but only one postfix
ex:
++--++foo; // valid
foo++--++; // invalid
--foo++; // invalid
Why is this?
This is due to the fact that in C++ (but not C), the result of
++xis a lValue, meaning it is assignable, and thus chain-able.However, the result of
x++is NOT an lValue, instead it is a prValue, meaning it cannot be assigned to, and thus cannot be chained.