suzanne.soy/racket
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

specify default for stronger

Browse Source
This commit is contained in:
Robby Findler 2015-12-15 20:35:28 -06:00
parent ca237910b3
commit 33ba7683b2
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
pkgs/racket-doc/scribblings/reference/contracts.scrbl
View File

@ -2012,7 +2012,9 @@ flat contracts do not need to supply an explicit projection.
The @racket[stronger] argument is used to implement @racket[contract-stronger?]. The
first argument is always the contract itself and the second argument is whatever
was passed as the second argument to @racket[contract-stronger?].
was passed as the second argument to @racket[contract-stronger?]. If no
@racket[stronger] argument is supplied, then a default that always returns
@racket[#f] is used.
The @racket[is-list-contract?] argument is used by the @racket[list-contract?] predicate
to determine if this is a contract that accepts only @racket[list?] values.
@ -2556,7 +2558,8 @@ which produces a description to @racket[write] as part of a contract violation;
produces a blame-tracking projection defining the behavior of the contract;
@racket[stronger], which is a predicate that determines whether this contract
(passed in the first argument) is stronger than some other contract (passed
in the second argument); @racket[generate], which returns a thunk
in the second argument) and whose default always returns @racket[#f];
@racket[generate], which returns a thunk
that generates random values matching the contract (using @racket[contract-random-generate-fail])
to indicate failure) or @racket[#f] to indicate
that random generation for this contract isn't supported; @racket[exercise],