diff options
| -rw-r--r-- | lib.c | 11 | ||||
| -rw-r--r-- | tests/012/aseq.tl | 2 | ||||
| -rw-r--r-- | txr.1 | 18 |
3 files changed, 30 insertions, 1 deletions
@@ -9246,6 +9246,11 @@ val ref(val seq, val ind) return gethash(seq, ind); if (seq->co.cls == carray_s) return carray_ref(seq, ind); + if (structp(seq)) { + val lambda_meth = maybe_slot(seq, lambda_s); + if (lambda_meth) + return funcall2(lambda_meth, seq, ind); + } /* fallthrough */ case CONS: case LCONS: @@ -9283,6 +9288,12 @@ val refset(val seq, val ind, val newval) return sethash(seq, ind, newval); if (seq->co.cls == carray_s) return carray_refset(seq, ind, newval); + if (structp(seq)) { + val lambda_set_meth = maybe_slot(seq, lambda_set_s); + if (lambda_set_meth) + return funcall3(lambda_set_meth, seq, ind, newval); + } + /* fallthrough */ default: type_mismatch(lit("ref: ~s is not a sequence"), seq, nao); } diff --git a/tests/012/aseq.tl b/tests/012/aseq.tl index 7901c4ab..fc6cf76b 100644 --- a/tests/012/aseq.tl +++ b/tests/012/aseq.tl @@ -5,7 +5,7 @@ (:method cdr (me) (if (cdr me.list) (new (add me.n (cdr me.list))))) (:method car (me) (+ me.n (car me.list))) (:method nullify (me) (if me.list me)) - (:method lambda (me i) (ref me i))) + (:method lambda (me i) (+ me.n (ref me.list i)))) (defvarl o (new (add 3 (range 10 100 10)))) @@ -25596,6 +25596,24 @@ has retrieval and storage; in that case .meta index isn't restricted to an integer value. +If +.meta seq +is a structure, it supports +.code ref +if it has a +.code lambda +method. The +.meta index +argument is passed to that method, and the resulting value is +returned. Similarly, a structure supports +.code refset +if it has a +.code lambda-set +method, which is called with +.meta index +and +.metn new-value . + The .code ref function retrieves an element of |