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-rw-r--r--gnuradio-core/src/lib/runtime/gr_sync_decimator.h2
-rw-r--r--gnuradio-core/src/lib/runtime/gr_sync_interpolator.h1
2 files changed, 2 insertions, 1 deletions
diff --git a/gnuradio-core/src/lib/runtime/gr_sync_decimator.h b/gnuradio-core/src/lib/runtime/gr_sync_decimator.h
index b2ed3c4fe..7228d3655 100644
--- a/gnuradio-core/src/lib/runtime/gr_sync_decimator.h
+++ b/gnuradio-core/src/lib/runtime/gr_sync_decimator.h
@@ -38,7 +38,7 @@ class GR_CORE_API gr_sync_decimator : public gr_sync_block
unsigned d_decimation;
protected:
-
+ gr_sync_decimator (void){} //allows pure virtual interface sub-classes
gr_sync_decimator (const std::string &name,
gr_io_signature_sptr input_signature,
gr_io_signature_sptr output_signature,
diff --git a/gnuradio-core/src/lib/runtime/gr_sync_interpolator.h b/gnuradio-core/src/lib/runtime/gr_sync_interpolator.h
index d65b3da1e..c332a5272 100644
--- a/gnuradio-core/src/lib/runtime/gr_sync_interpolator.h
+++ b/gnuradio-core/src/lib/runtime/gr_sync_interpolator.h
@@ -38,6 +38,7 @@ class GR_CORE_API gr_sync_interpolator : public gr_sync_block
unsigned d_interpolation;
protected:
+ gr_sync_interpolator (void){} //allows pure virtual interface sub-classes
gr_sync_interpolator (const std::string &name,
gr_io_signature_sptr input_signature,
gr_io_signature_sptr output_signature,