(rnrs records syntactic (6)) library exports the syntactic
API for working with R6RS records.
Defines a new record type, introducing bindings for a record-type descriptor, a record constructor descriptor, a constructor procedure, a record predicate, and accessor and mutator procedures for the new record type’s fields.
name-spec must either be an identifier or must take the form
(record-name constructor-name predicate-name), where
record-name, constructor-name, and predicate-name are
all identifiers and specify the names to which, respectively, the
record-type descriptor, constructor, and predicate procedures will be
bound. If name-spec is only an identifier, it specifies the name
to which the generated record-type descriptor will be bound.
Each record-clause must be one of the following:
(fields field-spec*), where each field-spec specifies a field of the new record type and takes one of the following forms:
(immutable field-name accessor-name), which specifies an immutable field with the name field-name and binds an accessor procedure for it to the name given by accessor-name
(mutable field-name accessor-name mutator-name), which specifies a mutable field with the name field-name and binds accessor and mutator procedures to accessor-name and mutator-name, respectively
(immutable field-name), which specifies an immutable field with the name field-name; an accessor procedure for it will be created and named by appending record name and field-name with a hyphen separator
(mutable field-name), which specifies a mutable field with the name field-name; an accessor procedure for it will be created and named as described above; a mutator procedure will also be created and named by appending
-set!to the accessor name
field-name, which specifies an immutable field with the name field-name; an access procedure for it will be created and named as described above
(parent parent-name), where parent-name is a symbol giving the name of the record type to be used as the parent of the new record type
(protocol expression), where expression evaluates to a protocol procedure which behaves as described above, and is used to create a record constructor descriptor for the new record type
(sealed sealed?), where sealed? is a boolean value that specifies whether or not the new record type is sealed
(opaque opaque?), where opaque? is a boolean value that specifies whether or not the new record type is opaque
(nongenerative [uid]), which specifies that the record type is nongenerative via the optional uid uid. If uid is not specified, a unique uid will be generated at expansion time
(parent-rtd parent-rtd parent-cd), a more explicit form of the
parentform above; parent-rtd and parent-cd should evaluate to a record-type descriptor and a record constructor descriptor, respectively
Evaluates to the record-type descriptor associated with the type specified by record-name.
Evaluates to the record-constructor descriptor associated with the type specified by record-name.