how to support new type， like Ice::optional

[stan1334]

/**

• Ice::optional is a placeholder for std::optional.
• Refer to http://en.cppreference.com/w/cpp/utility/optional for more information.
  */
  template using optional = std::experimental::Ice::optional;

https://doc.zeroc.com/ice/3.7/best-practices/optional-values

reflect-cpp supports the following containers from the C++ standard library:
std::array
std::deque
std::filesystem::path
std::forward_list
std::map
std::multimap
std::multiset
std::list
std::optional
std::pair
std::set
std::shared_ptr
std::string
std::tuple
std::unique_ptr
std::unordered_map
std::unordered_multimap
std::unordered_multiset
std::unordered_set
std::variant
std::vector
std::wstring

if i want add new type Ice::optional，how to do,Please give me some guidance, thanks.

@liuzicheng1987
@zerolfx

[liuzicheng1987]

The most common way would be to implement a reflector:

https://github.com/getml/reflect-cpp/blob/main/docs/custom_parser.md

In other words, your ReflType would be std::optional.