The issue is that you don't want to forget to free the buffer.
Another approach is to not use FFI directly, but hide the glue in a module, where you could use an END block to ensure it's freed on exit.
package My::StringUtils;
use strict;
use warnings;
use Export qw( import );
use FFI::Platypus 2.00;
our @EXPORT_OK = qw( string_reverse );
my $ffi = FFI::Platypus->new(
api => 2,
lib => './string_reverse.so',
);
$ffi->attach( string_reverse => [ 'string' ] => 'string' );
END { string_reverse( undef ); }
1
use strict;
use warnings;
use feature qw( say );
use My::StringUtils qw( string_reverse );
say string_reverse( "Hello world" );
(Fine, you don't need a module to use END, but using a module means you don't forget to use END.)
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