F# is it possible to exclude one member of an record from structural equality?

Question

Example, nevermind the utility of it:

type Rec = ( int * obj )  
let r1 = (1, o1)
let r2 = (1, o2)
r1=r2   // i would like it to be true. I mean the second member to be excluded from structural equality

I'd be interested to know why you want this? – Søren Debois Apr 01 '14 at 21:05 — Søren Debois, Apr 01 '14 at 21:05
Yes, it seems it's a duplicate. – Liviu Apr 02 '14 at 05:57 — Liviu, Apr 02 '14 at 05:57

score 2 · Answer 1 · answered Apr 01 '14 at 20:54

2

Firstly, this isn't a record, but a type alias.

I think the best approach would be to define a new operator.

let inline (====) a b = (fst a ) = (fst b)

answered Apr 01 '14 at 20:54

John Palmer

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I need to add this objects to a Set, or as keys to a Map... – Liviu Apr 02 '14 at 05:21
In that case, the duplicate linked by mark is the correct answer – John Palmer Apr 02 '14 at 05:23

F# is it possible to exclude one member of an record from structural equality?

1 Answers1