File: swap.pl

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libffi-platypus-perl 2.10-1
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use strict;
use warnings;
use FFI::Platypus 2.00;

my $ffi = FFI::Platypus->new(
  api => 2,
  lib => './swap.so',
);

$ffi->attach( swap => ['int*','int*'] );

my $a = 1;
my $b = 2;

print "[a,b] = [$a,$b]\n";

swap( \$a, \$b );

print "[a,b] = [$a,$b]\n";