feat: add sorted linear finder

lib_vector_search/CMakeLists.txt

@@ -13,6 +13,8 @@ add_library(
   include/timer.h
   src/linear_finder.cpp
   include/linear_finder.h
+  src/sorted_linear_finder.cpp
+  include/sorted_linear_finder.h
   src/parallel_finder.cpp
   include/parallel_finder.h
   src/tree_finder.cpp

lib_vector_search/include/sorted_linear_finder.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "finder.h"
+
+#include <vector>
+
+class SortedLinearFinder : public Finder {
+private:
+  std::vector<const std::string *> word_list_;
+
+public:
+  SortedLinearFinder(const std::vector<std::string> &word_list);
+
+  std::forward_list<const std::string *>
+  find_prefix(std::string_view search_term) const override;
+};

lib_vector_search/src/sorted_linear_finder.cpp

@@ -0,0 +1,32 @@
+#include "sorted_linear_finder.h"
+
+#include <algorithm>
+#include <iterator>
+
+using std::vector, std::forward_list, std::string, std::string_view;
+
+SortedLinearFinder::SortedLinearFinder(const vector<string> &word_list) {
+  std::transform(word_list.cbegin(), word_list.cend(),
+                 std::back_inserter(word_list_),
+                 [](const string &word) { return &word; });
+
+  std::sort(
+      word_list_.begin(), word_list_.end(),
+      [](const string *left, const string *right) { return *left < *right; });
+}
+forward_list<const string *>
+SortedLinearFinder::find_prefix(string_view search_term) const {
+  forward_list<const string *> matching_words;
+
+  bool in_range = false;
+  for (const auto *word : word_list_) {
+    if (word->starts_with(search_term)) {
+      matching_words.push_front(word);
+      in_range = true;
+    } else if (in_range) {
+      break;
+    }
+  }
+
+  return matching_words;
+}