Filter: fixed example build

libraries/Filter/FilterWithBuffer.h

@@ -37,6 +37,10 @@ public:
         return FILTER_SIZE;
     };
 
+    virtual T get_sample(uint8_t i) {
+        return samples[i];
+    }
+
 protected:
     T               samples[FILTER_SIZE];       // buffer of samples
     uint8_t         sample_index;               // pointer to the next empty slot in the buffer

libraries/Filter/examples/Filter/Filter.pde

@@ -30,7 +30,7 @@ void printFilter(FilterWithBufferInt16_Size5& filter)
 {
     for(uint8_t i=0; i < filter.get_filter_size(); i++)
     {
-        Serial.printf("%d ",(int)filter.samples[i]);
+	    Serial.printf("%d ",(int)filter.get_sample(i));
     }
     Serial.println();
 }