There's this:
https://docs.racket-lang.org/reference/printing.html#%28part._print-structure%29
Here's an example:
#lang racket
(struct foo (A B) #:transparent) (define transp (foo 7 8))
(struct bar (A B) #:prefab) (define pref (bar 7 8))
(struct baz (A B)) (define normal (baz 7 8))
(parameterize ([print-struct #t]) ; default
(for ([f (list displayln println writeln)])
(display (~a (object-name f) ", normal: ")) (f normal)
(display (~a (object-name f) ", transparent: ")) (f transp)
(display (~a (object-name f) ", prefab : ")) (f pref)))
(displayln "\n----------- print-struct becomes #f")
(parameterize ([print-struct #f])
(for ([f (list displayln println writeln)])
(display (~a (object-name f) ", normal: ")) (f normal)
(display (~a (object-name f) ", transparent: ")) (f transp)
(display (~a (object-name f) ", prefab : ")) (f pref)))
And the output:
displayln, normal: #<baz>
displayln, transparent: #(struct:foo 7 8)
displayln, prefab : #s(bar 7 8)
println, normal: #<baz>
println, transparent: (foo 7 8)
println, prefab : '#s(bar 7 8)
writeln, normal: #<baz>
writeln, transparent: #(struct:foo 7 8)
writeln, prefab : #s(bar 7 8)
----------- print-struct becomes #f
displayln, normal: #<baz>
displayln, transparent: #<foo>
displayln, prefab : #<bar>
println, normal: #<baz>
println, transparent: #<foo>
println, prefab : #<bar>
writeln, normal: #<baz>
writeln, transparent: #<foo>
writeln, prefab : #<bar>
On Mon, Mar 26, 2018 at 11:58 AM, Kevin Forchione <lyss...@gmail.com> wrote:
> In another thread on structs it was confirmed that structs are in essence a
> vector with some fancy bindings associated. But there must be more going on,
> for instance, the definition (struct foo (A B)) creates a function foo that
> when applied does not print like a vector. Is there any documentation
> instructs that does into the details of what they are and are doing under the
> hood?
>
> Kevin
>
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