refactor: declare typedef only once

Author: anonrig

include/ada/url_search_params.h

@@ -68,7 +68,8 @@ struct url_search_params {
   std::string to_string();
 
  private:
-  std::vector<std::pair<std::string, std::string>> params{};
+  typedef std::pair<std::string, std::string> key_value_pair;
+  std::vector<key_value_pair> params{};
 };  // url_search_params
 
 }  // namespace ada

src/url_search_params.cpp

@@ -26,7 +26,6 @@ void url_search_params::remove(const std::string_view key,
 }
 
 void url_search_params::sort() {
-  typedef std::pair<std::string, std::string> key_value_pair;
   std::stable_sort(params.begin(), params.end(),
                    [](const key_value_pair &lhs, const key_value_pair &rhs) {
                      return lhs.first < rhs.first;