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minor field contract clarifications

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Robby Findler 2013-04-28 18:19:13 -05:00
parent 60610b737d
commit 3dbc3060f6
1 changed files with 8 additions and 5 deletions
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13
collects/scribblings/reference/class.scrbl
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@ -1811,10 +1811,11 @@ The external contracts are as follows:
(send (new woody+c%) draw #f)]
}
@item{An external field contract, tagged with @racket[field], describes the
behavior of the value contained in that field when accessed via an
object of that class. Since fields may be mutated, these contracts
are checked on any external access and/or mutation of the field.
behavior of the value contained in that field when accessed from outside
the class. Since fields may be mutated, these contracts
are checked on any external access (via @racket[get-field])
and external mutations (via @racket[set-field!]) of the field.
@defexamples[#:eval
class-eval
(define woody/hat%
@ -1834,7 +1835,9 @@ The external contracts are as follows:
(let ([woody (new woody/hat+c%)])
(send woody lose-hat)
(get-field hat-location woody))
(get-field hat-location (new woody/hat+c%))]
(get-field hat-location (new woody/hat+c%))
(let ([woody (new woody/hat+c%)])
(set-field! hat-location woody 'under-the-dresser))]
}
@item{An initialization argument contract, tagged with @racket[init],