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Fix typos and wording in chaperone docs

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This commit is contained in:
Asumu Takikawa 2012-06-22 17:57:32 -04:00
parent a0d55d4ab8
commit e4f216244a
1 changed files with 8 additions and 8 deletions
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16
collects/scribblings/reference/chaperones.scrbl
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@ -11,10 +11,10 @@
@title[#:tag "chaperones"]{Impersonators and Chaperones}
An @deftech{impersonator} is a wrapper for a value where the wrapper
redirects certain of the value's operations. Impersonators apply only to procedures,
redirects some of the value's operations. Impersonators apply only to procedures,
@tech{structures} for which an accessor or mutator is available,
@tech{structure types}, @tech{hash tables}, @tech{vectors},
and @tech{box}es. An impersonator is @racket[equal?] to the original
@tech{box}es, and @tech{prompt tag}s. An impersonator is @racket[equal?] to the original
value, but not @racket[eq?] to the original value.
A @deftech{chaperone} is a kind of impersonator whose refinement of a value's
@ -28,13 +28,13 @@ slot, but it cannot redirect @racket[vector-ref] to produce a value
that is arbitrarily different from the value in the vector slot.
A non-@tech{chaperone} @tech{impersonator}, in contrast, can refine an operation to swap one
value for any another. An impersonator cannot be applied to an immutable value
value for any other. An impersonator cannot be applied to an immutable value
or refine the access to an immutable field in an instance of a @tech{structure
type}, since arbitrary replacement of an operation's value amounts to
type}, since arbitrary redirection of an operation amounts to
mutation of the impersonated value.
Beware that each of the following operations can be redirected to
arbitrary procedure through impersonators on the operation's
Beware that each of the following operations can be redirected to an
arbitrary procedure through an impersonator on the operation's
argument---assuming that the operation is available to the creator of
the impersonator:
@ -176,7 +176,7 @@ of impersonators with respect to wrapping impersonators to be detected within
[prop-val any] ... ...)
any/c]{
Returns an impersonator of @racket[v], with redirect certain
Returns an impersonator of @racket[v], which redirects certain
operations on the impersonated value. The @racket[orig-proc]s
indicate the operations to redirect, and the corresponding
@racket[redirect-proc]s supply the redirections.
@ -288,7 +288,7 @@ from the table. Operations like @racket[hash-iterate-value] or
therefore redirect through @racket[ref-proc].
The @racket[ref-proc] must accept @racket[hash] and a key passed
@racket[hash-ref]. It must return a replacement key
to @racket[hash-ref]. It must return a replacement key
as well as a procedure. The returned procedure is called only if the
returned key is found in @racket[hash] via @racket[hash-ref], in which
case the procedure is called with @racket[hash], the previously