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(guile.info.gz) SRFI-17

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 39.14 SRFI-17 - Generalized set!
 ================================
 
 This is an implementation of SRFI-17: Generalized set!
 
    It exports the Guile procedure `make-procedure-with-setter' under
 the SRFI name `getter-with-setter' and exports the standard procedures
 `car', `cdr', ..., `cdddr', `string-ref' and `vector-ref' as procedures
 with setters, as required by the SRFI.
 
    SRFI-17 was heavily criticized during its discussion period but it
 was finalized anyway.  One issue was its concept of globally associating
 setter "properties" with (procedure) values, which is non-Schemy.  For
 this reason, this implementation chooses not to provide a way to set
 the setter of a procedure.  In fact, `(set!  (setter PROC) SETTER)'
 signals an error.  The only way to attach a setter to a procedure is to
 create a new object (a "procedure with setter") via the
 `getter-with-setter' procedure. This procedure is also specified in the
 SRFI.  Using it avoids the described problems.
 
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