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-rw-r--r--gnuradio-core/src/lib/filter/gr_single_pole_iir.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/gnuradio-core/src/lib/filter/gr_single_pole_iir.h b/gnuradio-core/src/lib/filter/gr_single_pole_iir.h
index da919b35c..8781065d4 100644
--- a/gnuradio-core/src/lib/filter/gr_single_pole_iir.h
+++ b/gnuradio-core/src/lib/filter/gr_single_pole_iir.h
@@ -71,7 +71,7 @@ public:
d_prev_output = 0;
}
- o_type prev_output () { return d_prev_output; }
+ o_type prev_output () const { return d_prev_output; }
protected:
tap_type d_alpha;
@@ -155,7 +155,7 @@ public:
d_prev_output = 0;
}
- gr_complexd prev_output () { return d_prev_output; }
+ gr_complexd prev_output () const { return d_prev_output; }
protected:
double d_alpha;