Fix some unused parameters warnings

Author: makekryl

include/rfl/OneOf.hpp

@@ -43,7 +43,7 @@ struct OneOf {
   static rfl::Result<T> validate_impl(const T& _value,
                                       std::vector<Error> _errors) {
     return Head::validate(_value)
-        .and_then([&](auto&& _result) -> rfl::Result<T> {
+        .and_then([&]([[maybe_unused]] auto&& _result) -> rfl::Result<T> {
           if constexpr (sizeof...(Tail) == 0) {
             if (_errors.size() == sizeof...(Cs)) {
               return _value;

include/rfl/parsing/Parser_basic_type.hpp

@@ -55,7 +55,7 @@ struct Parser<R, W, T, ProcessorsType> {
 
   /// Generates a schema for the underlying type.
   static schema::Type to_schema(
-      std::map<std::string, schema::Type>* _definitions) {
+      [[maybe_unused]] std::map<std::string, schema::Type>* _definitions) {
     using U = std::remove_cvref_t<T>;
     using Type = schema::Type;
     if constexpr (std::is_same<U, bool>()) {

include/rfl/toml/Writer.hpp

@@ -43,7 +43,7 @@ class RFL_API Writer {
   OutputVarType null_as_root() const;
 
   template <class T>
-  OutputVarType value_as_root(const T& _var) const {
+  OutputVarType value_as_root([[maybe_unused]] const T& _var) const {
     static_assert(rfl::always_false_v<T>,
                   "TOML only allows tables as the root element.");
     return OutputVarType{};