fixes

include/mcc/mcc_keyvalue.h

@@ -49,12 +49,12 @@ namespace mcc::impl
 struct MccKeyValueHolderCategory : public std::error_category {
     MccKeyValueHolderCategory() : std::error_category() {}
 
-    const char* name() const noexcept
+    const char* name() const noexcept override
     {
         return "MCC-KEYVALUEHOLDER-ERR-CATEGORY";
     }
 
-    std::string message(int ec) const
+    std::string message(int ec) const override
     {
         MccKeyValueHolderErrorCode err = static_cast<MccKeyValueHolderErrorCode>(ec);
 
@@ -90,14 +90,14 @@ inline std::error_code make_error_code(MccKeyValueHolderErrorCode ec)
 
 // to follow std::variant requirements (not references, not array, not void)
 template <typename T>
-concept mcc_variant_valid_type_c = requires { !std::is_array_v<T> && !std::is_void_v<T> && !std::is_reference_v<T>; };
+concept mcc_record_value_c = requires { !std::is_array_v<T> && !std::is_void_v<T> && !std::is_reference_v<T>; };
 
 
 template <typename T>
 concept mcc_keyvalue_record_c = requires(T t) {
     requires std::same_as<decltype(t.key), const std::string_view>;  // key name is immutable!!!
-    requires mcc_variant_valid_type_c<decltype(t.value)>;            // value is mutable
-    requires mcc_variant_valid_type_c<decltype(t.default_value)>;    // default value is mutable
+    requires mcc_record_value_c<decltype(t.value)>;                  // value is mutable
+    requires mcc_record_value_c<decltype(t.default_value)>;          // default value is mutable
     requires mcc_serialization_params_c<decltype(t.serial_pars)>;    // serialization parameters
 };
 
@@ -152,7 +152,7 @@ public:
     }
 
 
-    std::array<std::string_view, NUMBER_OF_RECORDS> keys() const
+    constexpr std::array<std::string_view, NUMBER_OF_RECORDS> keys() const
     {
         return [this]<size_t... Is>(std::index_sequence<Is...>) {
             return std::array<std::string_view, NUMBER_OF_RECORDS>{std::get<Is>(_keyValue).key...};
@@ -200,28 +200,32 @@ public:
     template <std::ranges::contiguous_range R, typename T>
     std::error_code setValue(R const& key, const T& value)
     {
-        return setValue<T>(std::string_view{key}, value);
+        return setValue(std::string_view{key}, value);
     }
 
     template <typename T>
     std::error_code setValue(std::string_view key, const T& value)
     {
-        return forKey(key, [&value](auto& rec) -> std::error_code {
+        const size_t hash = utils::FNV1aHash(key);
+
+        auto ec = forHash(hash, [&value](auto& rec) -> std::error_code {
             using VT = decltype(rec.value);
-            if constexpr (requires(VT v) { v = value; }) {
-                rec.value = value;
-            } else if constexpr (std::convertible_to<T, VT>) {
+            if constexpr (std::assignable_from<VT&, T>) {
                 rec.value = value;
             } else if constexpr (std::constructible_from<VT, T>) {
                 rec.value = VT(value);
-            } else if constexpr (std::assignable_from<VT, T>) {
-                rec.value = value;
             } else {
                 return MccKeyValueHolderErrorCode::ERROR_INCOMPATIBLE_TYPE;
             }
 
             return MccKeyValueHolderErrorCode::ERROR_OK;
         });
+
+        if (!ec) {
+            _changedKey.insert(hash);
+        }
+
+        return ec;
     }
 
     template <traits::mcc_input_char_range R,
@@ -262,6 +266,8 @@ public:
         for (auto const& el : recs) {
             rec = mcc::utils::trimSpaces(el, utils::TrimType::TRIM_LEFT);
 
+            inline_comm = {};
+
             if (rec.size()) {
                 auto found = std::ranges::search(rec, COMMENT_SEQ);
                 if (found.begin() != rec.end()) {        // there was the comment sequence in record
@@ -290,7 +296,7 @@ public:
                                 return MccKeyValueHolderErrorCode::ERROR_DESERIAL;
                             }
 
-                            // _changedKey.insert(key_hash);
+                            _changedKey.insert(key_hash);
 
                             return MccKeyValueHolderErrorCode::ERROR_OK;
                         });
@@ -440,15 +446,12 @@ protected:
             auto key = std::get<I>(_keyValue).key;
             using val_t = std::remove_cvref_t<decltype(std::get<I>(_keyValue).value)>;
 
-            val_t& val_ptr = std::get<I>(_keyValue).value;
-            if (is_default) {
-                val_ptr = std::get<I>(_keyValue).default_value;
-            }
+            const val_t& val = is_default ? std::get<I>(_keyValue).default_value : std::get<I>(_keyValue).value;
 
             std::string buff;
             // auto err = MccSerializer<val_t>{}(buff, std::get<I>(_keyValue).value,
             // std::get<I>(_keyValue).serial_pars);
-            auto err = MccSerializer<val_t>{}(buff, val_ptr, std::get<I>(_keyValue).serial_pars);
+            auto err = MccSerializer<val_t>{}(buff, val, std::get<I>(_keyValue).serial_pars);
             if (err) {
                 return MccKeyValueHolderErrorCode::ERROR_SERIAL;
             } else {
@@ -480,14 +483,14 @@ protected:
     }
 };
 
-template <mcc_variant_valid_type_c T>
+template <mcc_record_value_c T>
 struct mcc_simple_kv_record_t {
     const std::string_view key;
     T value, default_value;
     mcc_serialization_params_t serial_pars;
 };
 
-template <mcc_variant_valid_type_c T>
+template <mcc_record_value_c T>
 static mcc_simple_kv_record_t<T> mcc_make_simple_kv_record(
     std::string_view key,
     T const& def_value,