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Tuple - provide an immutable List value type
use Tuple; my @a is Tuple = ^10; # initialization follows single-argument semantics my @b is Tuple = ^10; set( @a, @b ); # elems == 1 my $t = tuple(^10); # also exports a "tuple" sub
Perl 6 provides a semi-immutable Positional datatype: List. A
List can not have any elements added or removed from it. However, since a list can contain containers of which the value can be changed, it is not a value type. So you cannot use Lists in data structures such as
Sets, because each List is considered to be different from any other List, because they are not value types.
Since Lists are used very heavily internally with the current semantics, it is a daunting task to make them truly immutable value types. Hence the introduction of the
Tuple data type.
Elizabeth Mattijsen email@example.com
Source can be located at: https://github.com/lizmat/Tuple . Comments and Pull Requests are welcome.
Copyright 2018 Elizabeth Mattijsen
This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.