added reset_sample_state as interface requirement and made it a no-op

Author: Gillgamesh

include/sketch/sketch_columns.h

@@ -35,6 +35,9 @@ class FixedSizeSketchColumn {
   void merge(FixedSizeSketchColumn &other);
   uint8_t get_depth() const;
   void serialize(std::ostream &binary_out) const;
+  void reset_sample_state() {
+    //no-op
+  };
   friend std::ostream& operator<<(std::ostream &os, const FixedSizeSketchColumn &sketch) {
     os << "FixedSizeSketchColumn: " << std::endl;
     os << "Capacity: " << (int)sketch.capacity << std::endl;
@@ -133,6 +136,9 @@ class ResizeableSketchColumn {
   void update(const vec_t update);
   void merge(ResizeableSketchColumn &other);
   uint8_t get_depth() const;
+  void reset_sample_state() {
+    //no-op
+  };
   void serialize(std::ostream &binary_out) const;
 private:
   void reallocate(uint8_t new_capacity);

include/sketch/sketch_concept.h

@@ -42,6 +42,7 @@ concept SketchColumnConcept = requires(T t, T other) {
   { t.get_seed() } -> std::same_as<uint64_t>;
 
   { t.serialize(std::declval<std::ostream&>()) };
+  { t.reset_sample_state()} -> std::same_as<void>;
 };
 
 /*