Stream: helpdesk (published)

Topic: Defining the "order" to which to evaluate an expression

Davi Sales Barreira (Sep 19 2023 at 18:41):

Suppose that I define two functions using \oplus(x::Int, y::Int) and \otimes(x::Int, y::Int). Is it possible to define an evaluation order for these operations? For example, so that 1 \oplus 2 \otimes 3 equals 1 + 2* 3 .

DrChainsaw (Sep 19 2023 at 19:19):

I believe the operator precedence is hard coded: https://docs.julialang.org/en/v1/manual/mathematical-operations/#Operator-Precedence-and-Associativity

Davi Sales Barreira (Sep 20 2023 at 10:50):

Is the associativity also hard coded? No way to change them?

Sukera (Sep 20 2023 at 10:51):

yes

Sukera (Sep 20 2023 at 10:52):

imagine you have two packages, both defining an \oplus for their type - the decision for associativity needs to be made before types are known, so how could Julia decide which to use?

Davi Sales Barreira (Sep 20 2023 at 10:54):

Makes sense. Thanks @Sukera

Last updated: Oct 02 2023 at 04:34 UTC