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=head1 NAME |
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Coro::Cont - schmorp's faked continuations |
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=head1 SYNOPSIS |
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use Coro::Cont; |
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# multiply all hash keys by 2 |
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my $cont = cont { |
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result $_*2; |
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result $_; |
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}; |
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my %hash2 = map &$cont, &hash1; |
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=head1 DESCRIPTION |
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=over 4 |
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=cut |
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package Coro::Cont; |
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use Coro::State; |
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use Coro::Specific; |
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use base 'Exporter'; |
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$VERSION = 0.01; |
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@EXPORT = qw(cont result); |
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=item cont { ... } |
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Create a new "continuation" (well, almost, you cannot return from it). |
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=cut |
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our $curr = new Coro::Specific; |
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our @result; |
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sub cont(&) { |
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my $code = $_[0]; |
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my $coro = new Coro::State sub { &$code while 1 }; |
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my $prev = new Coro::State; |
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sub { |
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push @$$curr, [$coro, $prev]; |
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$prev->transfer($coro); |
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wantarray ? @{pop @result} : ${pop @result}[0]; |
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}; |
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} |
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=item result [list] |
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Return the given list/scalar as result of the continuation. |
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=cut |
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sub result { |
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push @result, [@_]; |
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&Coro::State::transfer(@{pop @$$curr}); |
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} |
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1; |
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=back |
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=head1 AUTHOR |
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Marc Lehmann <pcg@goof.com> |
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http://www.goof.com/pcg/marc/ |
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=cut |
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