Re: [tlaplus] When to prefer function or operator?

When defining an object V, you may have to decide whether to make V an operator that takes an argument or a function. The differences between operators and functions will often determine the decision. [...] If these differences don’t determine whether to use an operator or a function, then the choice is a matter of taste. I usually prefer operators.

Regards,

Stephan

[1] Since the publication of Specifying Systems, recursive operator definitions have been added to TLA+ and therefore the arguments about recursive definitions no longer apply.

On 21 Aug 2020, at 16:34, thomas...@gmail.com <thomasgebert@xxxxxxxxx> wrote:

There are cases when either a function or operator will solve a task more-or-less equivalently.

For example, both this function and operator accomplish a roughly-equivalent result:

addOne[x \in Nat] == x + 1
addOneOperator(x) == x + 1

My question is: when either an operator or function will accomplish a job, which one would you prefer? What are the tradeoffs?

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