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Postings from June 2022
> On 10 Jun 2022, at 22:47, ToddAndMargo via perl6-users <perl6-users@perl.org> wrote:
>
>>> On Fri, 10 Jun 2022 at 15:49, ToddAndMargo via perl6-users <perl6-users@perl.org <mailto:perl6-users@perl.org>> wrote:
>>> Hi All,
>>> I am looking for an easier way to load a buffer.
>>> I know about this way
>>> [4] > my Buf $b=Buf.new(0x2A, 0x54, 0xFF, 0x53);
>>> Buf:0x<2A 54 FF 53>
>>> I would like to do it on one big blast:
>>> my Buf $b=Buf.new(0x2A54FF53A5F1D36F1CEA7E61FC37A20D54A77FE7B78);
>>> Cannot unbox 170 bit wide bigint into native integer
>>> But do not know the proper syntax.
>>> Any words of wisdom? Am I stuck with the hard way?
>>> Many thanks,
>>> -T
>
> On 6/10/22 08:36, Simon Proctor wrote:
>> So Buf is expecting a list of integers. If' you've got one long one in a string like "2A54FF53A5F1D36F1CEA7E61FC37A20D54A77FE7B78" you want to split it into smaller values so something like this?
>> my $hex = "2A54FF53A5F1D36F1CEA7E61FC37A20D54A77FE7B78";
>> my Buf $b=Buf.new(comb(2).map( *.parse-base(16) ));
>> Which does the trick I think.
>
> What does the * i *.parse-base do?
*.parse-base(16) is an example of a WhateverCode object.
It is basically syntactic sugar for easy creation of Callable blocks. In this case,
it created -> $_ { .parse-base(16) }
The * is interpreted in the Raku Grammar as a sign to create a WhateverCode object: it basically
represents the $_ in the signature of the created Block, and of course the $_ inside that block.:
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