Minor improvements

Author: liuzicheng1987

include/rfl/yas/Reader.hpp

@@ -120,7 +120,7 @@ struct Reader {
   std::optional<Error> read_object(const ObjectReader& _object_reader,
                                    const InputObjectType& _obj) const noexcept {
     try {
-      for (size_t i = 0; i < ObjectReader::size(); ++i) {
+      for (std::size_t i = 0; i < ObjectReader::size(); ++i) {
         _object_reader.read(i, InputVarType{_obj.ar});
       }
       return std::nullopt;

include/rfl/yas/Writer.hpp

@@ -172,7 +172,7 @@ struct Writer {
   template <class T>
   OutputVarType add_value_to_union(const size_t _index, const T& _var,
                                    OutputUnionType* _parent) const {
-    (*ar_)(_index);
+    (*ar_) & _index;
     add_value(_var);
     return OutputVarType{};
   }

include/rfl/yas/write.hpp

@@ -37,7 +37,7 @@ std::vector<char> write(const auto& _obj) {
   return std::vector<char>(buf.data, buf.data + buf.size);
 }
 
-/// Writes Cereal binary format into an ostream.
+/// Writes yas binary format into an ostream.
 template <class... Ps>
 std::ostream& write(const auto& _obj, std::ostream& _stream) {
   ::yas::mem_ostream os;