Pad Source pad_source Label label in string Output Type type enum Complex complex size:gr.sizeof_gr_complex Float float size:gr.sizeof_float Int int size:gr.sizeof_int Short short size:gr.sizeof_short Byte byte size:gr.sizeof_char Vec Length vlen 1 int $vlen > 0 out $type $vlen The outputs of this block will become the inputs to this flow graph when it is instantiated as a hierarchical block. Pad sources will be ordered alphabetically by their ids. The first pad source will have an index of 0.