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open arrays documented in the manual

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Araq 2013-02-10 15:06:25 +01:00
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16
doc/manual.txt
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@ -911,7 +911,21 @@ Arrays are always bounds checked (at compile-time or at runtime). These
checks can be disabled via pragmas or invoking the compiler with the
``--boundChecks:off`` command line switch.
The current implementation does not support nested open arrays.
Open arrays
-----------
Often fixed size arrays turn out to be too inflexible; procedures should
be able to deal with arrays of different sizes. The `openarray`:idx: type
allows this; it can only be used for parameters. Openarrays are always
indexed with an ``int`` starting at position 0. The ``len``, ``low``
and ``high`` operations are available for open arrays too. Any array with
a compatible base type can be passed to an openarray parameter, the index
type does not matter. In addition to arrays sequences can also be passed
to an open array parameter.
The openarray type cannot be nested: multidimensional openarrays are not
supported because this is seldom needed and cannot be done efficiently.
Varargs