Hi,
> Essentially lazy lists are suspended closures. But I dought that
> arithmetic between them is defined such that pi + pi would leazily
> calculate 6.28...
...which makes me wonder if it'd be good|cool|whatever to not only have
lazy lists, but also lazy *values*...: :))
my $pi = calc_pi_lazily();
say substr $pi, 0, 5; # calculates and outputs the
# first five digits of pi
say substr $pi, 0, 10000000; # calculates and outputs
# digits 0 to 10000000-1 of pi
my $sum = $pi * 2 + calc_e_lazily();
say substr $sum, 0, 100; # calculates and outputs the
# first 99 digits of 2pi + e
(Internally, this $pi could just be a Num::Lazy which hasa lazy @.digits
and which has an appropriate MMD entry for substr. But this is an
implementation detail.)
And:
my @ones = gather { take 1 while 1 };
my $ones = join "", @ones; # does not burn out!
say length $ones; # Inf
:)
--Ingo
--
Linux, the choice of a GNU | Memorize 1000 digits of pi
generation on a dual AMD | http://theory.cs.iitm.ernet.in/~arvindn/pi/
Athlon! |
