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-rw-r--r--gnuradio-core/src/lib/runtime/gr_block.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnuradio-core/src/lib/runtime/gr_block.h b/gnuradio-core/src/lib/runtime/gr_block.h
index ad7fa9555..fc22f9ea8 100644
--- a/gnuradio-core/src/lib/runtime/gr_block.h
+++ b/gnuradio-core/src/lib/runtime/gr_block.h
@@ -236,7 +236,7 @@ class gr_block : public gr_basic_block {
tag_propagation_policy_t d_tag_propagation_policy; // policy for moving tags downstream
protected:
-
+ gr_block (void){} //allows pure virtual interface sub-classes
gr_block (const std::string &name,
gr_io_signature_sptr input_signature,
gr_io_signature_sptr output_signature);