[require c++20] [moved to stduuid]

include/utils/utils.hpp

@@ -107,8 +107,8 @@ void spin_wait_for_mutex(std::function<bool()> complete,
 void spin_wait_for_mutex(bool &complete, std::condition_variable &cond,
                          std::mutex &mtx, const std::string &text = "");
 
-template <typename t>
-[[nodiscard]] auto to_hex_string(const t &val) -> std::string;
+template <typename collection_t>
+[[nodiscard]] auto to_hex_string(const collection_t &collection) -> std::string;
 
 // template implementations
 template <typename t>
@@ -154,29 +154,27 @@ template <typename data_type>
   return begin + repertory_rand<data_type>() % ((end + 1) - begin);
 }
 
-template <typename t>
-void remove_element_from(t &collection, const typename t::value_type &value) {
+template <typename collection_t>
+void remove_element_from(collection_t &collection,
+                         const typename collection_t::value_type &value) {
   collection.erase(std::remove(collection.begin(), collection.end(), value),
                    collection.end());
 }
 
-template <typename t>
-[[nodiscard]] auto to_hex_string(const t &value) -> std::string {
-  std::string ret{};
+template <typename collection_t>
+[[nodiscard]] auto to_hex_string(const collection_t &collection)
+    -> std::string {
+  static_assert(sizeof(typename collection_t::value_type) == 1U,
+                "value_type must be 1 byte in size");
+  static constexpr const auto mask = 0xFF;
 
-  std::array<char, 3> tmp{};
-  for (const auto &num : value) {
-#ifdef _WIN32
-    sprintf_s(h.data(), h.size() - 1U, "%x", static_cast<std::uint8_t>(num));
-#else
-    sprintf(tmp.data(), "%x", static_cast<std::uint8_t>(num));
-#endif
-
-    ret +=
-        (strlen(tmp.data()) == 1) ? std::string("0") + tmp.data() : tmp.data();
+  std::stringstream stream;
+  for (const auto &val : collection) {
+    stream << std::setfill('0') << std::setw(2) << std::hex
+           << (static_cast<std::uint32_t>(val) & mask);
   }
 
-  return ret;
+  return stream.str();
 }
 } // namespace repertory::utils