Add `override` for common virtual function overrides

Mostly done with:

```
find -name "*_impl.h" | xargs sed -i -r '/(void forecast|int work|int general_work|bool check_topology)\(/{:back /\)/b nxt;N;b back;:nxt s/\)$|\)(;)/) override\1/g}'
```

Then I removed an incorrect `work` that this found.

18 files changed, 20 insertions, 20 deletions

diff --git a/gr-vocoder/lib/alaw_decode_bs_impl.h b/gr-vocoder/lib/alaw_decode_bs_impl.h
index 03b02bdd2..546aad41d 100644
--- a/gr-vocoder/lib/alaw_decode_bs_impl.h
+++ b/gr-vocoder/lib/alaw_decode_bs_impl.h
@@ -24,7 +24,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/alaw_encode_sb_impl.h b/gr-vocoder/lib/alaw_encode_sb_impl.h
index e5e350a54..425ef8b21 100644
--- a/gr-vocoder/lib/alaw_encode_sb_impl.h
+++ b/gr-vocoder/lib/alaw_encode_sb_impl.h
@@ -24,7 +24,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/codec2_decode_ps_impl.h b/gr-vocoder/lib/codec2_decode_ps_impl.h
index f6af0b4e2..af291b752 100644
--- a/gr-vocoder/lib/codec2_decode_ps_impl.h
+++ b/gr-vocoder/lib/codec2_decode_ps_impl.h
@@ -33,7 +33,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/codec2_encode_sp_impl.h b/gr-vocoder/lib/codec2_encode_sp_impl.h
index b4b459a17..a3e7c87ae 100644
--- a/gr-vocoder/lib/codec2_encode_sp_impl.h
+++ b/gr-vocoder/lib/codec2_encode_sp_impl.h
@@ -33,7 +33,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/cvsd_decode_bs_impl.h b/gr-vocoder/lib/cvsd_decode_bs_impl.h
index fb31107bd..79e39c0ac 100644
--- a/gr-vocoder/lib/cvsd_decode_bs_impl.h
+++ b/gr-vocoder/lib/cvsd_decode_bs_impl.h
@@ -74,7 +74,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/cvsd_encode_sb_impl.h b/gr-vocoder/lib/cvsd_encode_sb_impl.h
index 815df69c6..ea6ab4e42 100644
--- a/gr-vocoder/lib/cvsd_encode_sb_impl.h
+++ b/gr-vocoder/lib/cvsd_encode_sb_impl.h
@@ -74,7 +74,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/freedv_rx_ss_impl.h b/gr-vocoder/lib/freedv_rx_ss_impl.h
index 9a5d991f1..71b92ba5c 100644
--- a/gr-vocoder/lib/freedv_rx_ss_impl.h
+++ b/gr-vocoder/lib/freedv_rx_ss_impl.h
@@ -53,12 +53,12 @@ public:
     void set_squelch_en(bool squelch_enabled);
 
     // Where all the action really happens
-    void forecast(int noutput_items, gr_vector_int& ninput_items_required);
+    void forecast(int noutput_items, gr_vector_int& ninput_items_required) override;
 
     int general_work(int noutput_items,
                      gr_vector_int& ninput_items,
                      gr_vector_const_void_star& input_items,
-                     gr_vector_void_star& output_items);
+                     gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/freedv_tx_ss_impl.h b/gr-vocoder/lib/freedv_tx_ss_impl.h
index bf4c0ccef..de999dcb7 100644
--- a/gr-vocoder/lib/freedv_tx_ss_impl.h
+++ b/gr-vocoder/lib/freedv_tx_ss_impl.h
@@ -50,12 +50,12 @@ public:
     void set_tx_bpf(int val);
 
     // Where all the action really happens
-    void forecast(int noutput_items, gr_vector_int& ninput_items_required);
+    void forecast(int noutput_items, gr_vector_int& ninput_items_required) override;
 
     int general_work(int noutput_items,
                      gr_vector_int& ninput_items,
                      gr_vector_const_void_star& input_items,
-                     gr_vector_void_star& output_items);
+                     gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/g721_decode_bs_impl.h b/gr-vocoder/lib/g721_decode_bs_impl.h
index b78c262e7..02f418a45 100644
--- a/gr-vocoder/lib/g721_decode_bs_impl.h
+++ b/gr-vocoder/lib/g721_decode_bs_impl.h
@@ -31,7 +31,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/g721_encode_sb_impl.h b/gr-vocoder/lib/g721_encode_sb_impl.h
index 27acc414e..98ac0ee9c 100644
--- a/gr-vocoder/lib/g721_encode_sb_impl.h
+++ b/gr-vocoder/lib/g721_encode_sb_impl.h
@@ -31,7 +31,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/g723_24_decode_bs_impl.h b/gr-vocoder/lib/g723_24_decode_bs_impl.h
index 99bd20d2c..16b88449a 100644
--- a/gr-vocoder/lib/g723_24_decode_bs_impl.h
+++ b/gr-vocoder/lib/g723_24_decode_bs_impl.h
@@ -31,7 +31,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/g723_24_encode_sb_impl.h b/gr-vocoder/lib/g723_24_encode_sb_impl.h
index d87b25095..7c1d5edcf 100644
--- a/gr-vocoder/lib/g723_24_encode_sb_impl.h
+++ b/gr-vocoder/lib/g723_24_encode_sb_impl.h
@@ -31,7 +31,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/g723_40_decode_bs_impl.h b/gr-vocoder/lib/g723_40_decode_bs_impl.h
index 364b804c4..07ecec788 100644
--- a/gr-vocoder/lib/g723_40_decode_bs_impl.h
+++ b/gr-vocoder/lib/g723_40_decode_bs_impl.h
@@ -31,7 +31,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/g723_40_encode_sb_impl.h b/gr-vocoder/lib/g723_40_encode_sb_impl.h
index 79491431f..1e84fa6cd 100644
--- a/gr-vocoder/lib/g723_40_encode_sb_impl.h
+++ b/gr-vocoder/lib/g723_40_encode_sb_impl.h
@@ -31,7 +31,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/gsm_fr_decode_ps_impl.h b/gr-vocoder/lib/gsm_fr_decode_ps_impl.h
index 041c456ca..3041f4625 100644
--- a/gr-vocoder/lib/gsm_fr_decode_ps_impl.h
+++ b/gr-vocoder/lib/gsm_fr_decode_ps_impl.h
@@ -31,7 +31,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/gsm_fr_encode_sp_impl.h b/gr-vocoder/lib/gsm_fr_encode_sp_impl.h
index ef72d8c5c..390224ddb 100644
--- a/gr-vocoder/lib/gsm_fr_encode_sp_impl.h
+++ b/gr-vocoder/lib/gsm_fr_encode_sp_impl.h
@@ -31,7 +31,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/ulaw_decode_bs_impl.h b/gr-vocoder/lib/ulaw_decode_bs_impl.h
index 3988c0f67..9b0927105 100644
--- a/gr-vocoder/lib/ulaw_decode_bs_impl.h
+++ b/gr-vocoder/lib/ulaw_decode_bs_impl.h
@@ -24,7 +24,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */
diff --git a/gr-vocoder/lib/ulaw_encode_sb_impl.h b/gr-vocoder/lib/ulaw_encode_sb_impl.h
index 63c1b2656..bb54f7a10 100644
--- a/gr-vocoder/lib/ulaw_encode_sb_impl.h
+++ b/gr-vocoder/lib/ulaw_encode_sb_impl.h
@@ -24,7 +24,7 @@ public:
 
     int work(int noutput_items,
              gr_vector_const_void_star& input_items,
-             gr_vector_void_star& output_items);
+             gr_vector_void_star& output_items) override;
 };
 
 } /* namespace vocoder */