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-rw-r--r--gnuradio-core/src/lib/runtime/gr_hier_block2.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/runtime/gr_hier_block2.h b/gnuradio-core/src/lib/runtime/gr_hier_block2.h
index 8687b7d99..9652f6bf4 100644
--- a/gnuradio-core/src/lib/runtime/gr_hier_block2.h
+++ b/gnuradio-core/src/lib/runtime/gr_hier_block2.h
@@ -55,6 +55,7 @@ private:
gr_hier_block2_detail *d_detail;
protected:
+ gr_hier_block2 (void){} //allows pure virtual interface sub-classes
gr_hier_block2(const std::string &name,
gr_io_signature_sptr input_signature,
gr_io_signature_sptr output_signature);