draconisplusplus/include/rfl/Size.hpp

#ifndef RFL_SIZE_HPP_
#define RFL_SIZE_HPP_

#include <map>

#include "Ref.hpp"
#include "Result.hpp"
#include "parsing/Parser.hpp"
#include "parsing/schema/ValidationType.hpp"

namespace rfl {

  template <class V>
  struct Size {
    template <class T>
    static rfl::Result<T> validate(const T& _t) {
      const auto to_t            = [&](const auto& _v) { return _t; };
      const auto embellish_error = [](const auto& _err) {
        return Error("Size validation failed: " + _err.what());
      };
      return V::validate(_t.size()).transform(to_t).or_else(embellish_error);
    }

    template <class T>
    static parsing::schema::ValidationType to_schema() {
      return V::template to_schema<size_t>();
    }
  };

} // namespace rfl

#endif