3 files changed, 14 insertions, 5 deletions
diff --git a/include/gnuradio/block.hpp b/include/gnuradio/block.hpp
index 87ebb33..2bfc5b6 100644
--- a/include/gnuradio/block.hpp
+++ b/include/gnuradio/block.hpp
@@ -86,13 +86,21 @@ struct GR_RUNTIME_API Block : Element
 
     std::string name(void) const;
 
+    size_t input_size(const size_t which_input) const;
+
+    size_t output_size(const size_t which_output) const;
+
+    void set_input_size(const size_t size, const size_t which_input);
+
+    void set_output_size(const size_t size, const size_t which_output);
+
     size_t history(const size_t which_input = 0) const;
 
     void set_history(const size_t history, const size_t which_input = 0);
 
-    void set_output_multiple(const size_t multiple, const size_t which_input = 0);
+    void set_output_multiple(const size_t multiple, const size_t which_output = 0);
 
-    size_t output_multiple(const size_t which_input = 0) const;
+    size_t output_multiple(const size_t which_output = 0) const;
 
     void consume(const size_t which_input, const size_t how_many_items);
 
diff --git a/include/gnuradio/gr_block.h b/include/gnuradio/gr_block.h
index 4c9b5c2..cdb5d4a 100644
--- a/include/gnuradio/gr_block.h
+++ b/include/gnuradio/gr_block.h
@@ -42,9 +42,9 @@ struct GR_RUNTIME_API gr_block : gnuradio::Block
 
     void set_input_signature(gr_io_signature_sptr);
 
-    gr_io_signature_sptr input_signature(void);
+    gr_io_signature_sptr input_signature(void) const;
 
-    gr_io_signature_sptr output_signature(void);
+    gr_io_signature_sptr output_signature(void) const;
 
     //! implements work -> calls general work
     int work(
diff --git a/include/gnuradio/gr_io_signature.h b/include/gnuradio/gr_io_signature.h
index 26a9884..870c1f5 100644
--- a/include/gnuradio/gr_io_signature.h
+++ b/include/gnuradio/gr_io_signature.h
@@ -76,10 +76,11 @@ inline gr_io_signature_sptr gr_make_io_signature3(
     return io_sig;
 }
 
+template <typename T>
 inline gr_io_signature_sptr gr_make_io_signaturev(
     int min_streams,
     int max_streams,
-    const std::vector<int> &sizeof_stream_items
+    const std::vector<T> &sizeof_stream_items
 ){
     gr_io_signature_sptr io_sig(new gnuradio::IOSignature());
     io_sig->set_min_streams(min_streams);