Warning: This is the manual of the legacy Guile 2.0 series. You may want to read the manual of the current stable series instead.

7.6.2.10 rnrs records procedural

The (rnrs records procedural (6)) library exports the procedural API for working with R6RS records.

Scheme Procedure: make-record-type-descriptor name parent uid sealed? opaque? fields

Returns a new record-type descriptor with the specified characteristics: name must be a symbol giving the name of the new record type; parent must be either #f or a non-sealed record-type descriptor for the returned record type to extend; uid must be either #f, indicating that the record type is generative, or a symbol giving the type’s nongenerative uid; sealed? and opaque? must be boolean values that specify the sealedness and opaqueness of the record type; fields must be a vector of zero or more field specifiers of the form (mutable name) or (immutable name), where name is a symbol giving a name for the field.

If uid is not #f, it must be a symbol

Scheme Procedure: record-type-descriptor? obj

Returns #t if obj is a record-type descriptor, #f otherwise.

Scheme Procedure: make-record-constructor-descriptor rtd parent-constructor-descriptor protocol

Returns a new record constructor descriptor that can be used to produce constructors for the record type specified by the record-type descriptor rtd and whose delegation and binding behavior are specified by the protocol procedure protocol.

parent-constructor-descriptor specifies a record constructor descriptor for the parent type of rtd, if one exists. If rtd represents a base type, then parent-constructor-descriptor must be #f. If rtd is an extension of another type, parent-constructor-descriptor may still be #f, but protocol must also be #f in this case.

Scheme Procedure: record-constructor rcd

Returns a record constructor procedure by invoking the protocol defined by the record-constructor descriptor rcd.

Scheme Procedure: record-predicate rtd

Returns the record predicate procedure for the record-type descriptor rtd.

Scheme Procedure: record-accessor rtd k

Returns the record field accessor procedure for the kth field of the record-type descriptor rtd.

Scheme Procedure: record-mutator rtd k

Returns the record field mutator procedure for the kth field of the record-type descriptor rtd. An &assertion condition will be raised if this field is not mutable.