raku-rosettacode/programming_tasks/C/Call_a_foreign-language_function.md

Call a foreign-language function

use NativeCall;
 
sub strdup(Str $s --> OpaquePointer) is native {*}
sub puts(OpaquePointer $p --> int32) is native {*}
sub free(OpaquePointer $p --> int32) is native {*}
 
my $p = strdup("Success!");
say 'puts returns ', puts($p);
say 'free returns ', free($p);

Output:

Success!
puts returns 9
free returns 0