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fix sentence

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svn: r8968
This commit is contained in:
Matthew Flatt 2008-03-13 21:04:07 +00:00
parent 293ba025ba
commit 421706a042
1 changed files with 8 additions and 7 deletions
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15
collects/scribblings/guide/define-struct.scrbl
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@ -269,18 +269,19 @@ Every @tech{prefab} structure type is @tech{transparent}---but even
less abstract than a @tech{transparent} type, because instances can be
created without any access to a particular structure-type declaration
or existing examples. Overall, the different options for structure
types cover a spectrum from more abstract to more convenient:
types offer a spectrum of possibilities from more abstract to more
convenient:
@itemize{
@item{@tech{Opaque} (the default) : instances cannot be inspected or
@item{@tech{Opaque} (the default) : Instances cannot be inspected or
forged without access to the structure-type declaration. As
discussed in the next section, @tech{constructor guards} and
@tech{properties} can be attached to the structure type to
further protect or to specialize the behavior of its
instances.}
@item{@tech{Transparent} : anyone can inspect or create an instance
@item{@tech{Transparent} : Anyone can inspect or create an instance
without access to the structure-type declaration, which means
that the value printer can show the content of an instance. All
instance creation passes through a @tech{constructor guard},
@ -291,7 +292,7 @@ types cover a spectrum from more abstract to more convenient:
name of the structure type, and therefore cannot be generated
automatically by the expression reader. }
@item{@tech{Prefab} : anyone can inspect or create an instance at any
@item{@tech{Prefab} : Anyone can inspect or create an instance at any
time, without prior access to a structure-type declaration or
an example instance. Consequently, the expression reader can
manufacture instances directly. The instance cannot have a
@ -300,9 +301,9 @@ types cover a spectrum from more abstract to more convenient:
}
Since the expression reader can generate @tech{prefab} instances, they
are useful when simple @tech{serialization} is needed and weak
abstraction is acceptable. @tech{Opaque} and @tech{transparent}
structures also can be serialized, however, if they are defined with
are useful when convenient @tech{serialization} is more important than
abstraction. @tech{Opaque} and @tech{transparent} structures also can
be serialized, however, if they are defined with
@scheme[define-serializable-struct] as described in
@secref["serialization"].