Chain Increment Operators

Ashley Medway Published at Dev

Ashley Medway

Why can you not chain operators?

int test = 5;
test++++;

int test = 5;
++test++;

This code gives a compile time error.

The operand of an increment or decrement operator must be a variable, property or indexer.

I fully understand this, if allowed, would be a complete code smell and has almost no real world usage. I don't fully understand why this results in an error. I would almost expect the value of test to be 7 after each statement.

Jon Skeet

Basically, it's due to section 7.6.9 of the specification:

The operand of a postfix increment or decrement operation must be an expression classified as a variable, a property access, or an indexer access. The result of the operation is a value of the same type as the operand.

The second sentence means that i++ is classified as a value (not a variable, unlike i) and the first sentence stops that from being the operand of the operator.

I suspect it was designed that way for simplicity, to avoid weird situations you really don't want to get into - not just the code you've given, but things like:

Foo(ref i++);
i++ = 10;

Collected from the Internet

Please contact [email protected] to delete if infringement.

edited at2021-02-16

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