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@node Lenses
@section Lenses
Provided by the module @code{(hnh util lens)}
@defun modify object lens f args ...
@end defun
@defmac modify* object lens
@defmacx modify* object lens rest ...
@end defmac
@defmac set object lenses ... value
@end defmac
@defmac get object lenses ...
@end defmac
@defun make-lens getter setter
@end defun
@defmac build-lens getter setter
Where any of getter or setter can either be a single symbol, or a list.
@end defmac
@deftp {Scheme Lens} identity-lens
@end deftp
@defun compose-lenses lenses ...
@defunx lens-compose lenses ...
Lenses composes left to right, so earlier lenses in @var{lenses} are
applied earlier.
@end defun
@deftp {Scheme Lens} ref idx
Focuses the element at index @var{idx} in a list.
@end deftp
@deftp {Scheme Lens} car*
@deftpx {Scheme Lens} cdr*
Focuses the first or second element of a pair.
@end deftp
@defun each object lens proc
@end defun
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