alef-backend-java 0.16.21

Java (Panama FFM) backend for alef
Documentation 
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            var outPtrHolder = arena.allocate(ValueLayout.ADDRESS);
            var outLenHolder = arena.allocate(ValueLayout.JAVA_LONG);
            var outCapHolder = arena.allocate(ValueLayout.JAVA_LONG);
            int rc = (int) {{ ffi_handle }}.invoke({{ args_joined }}, outPtrHolder, outLenHolder, outCapHolder);
{{ named_frees }}            byte[] result = readBytesResult(rc, outPtrHolder, outLenHolder, outCapHolder);
{%- if optional %}
            return result == null ? java.util.Optional.empty() : java.util.Optional.of(result);
{%- else %}
            return result;
{%- endif %}