data.rb

module H3
  class Resolution
    extend FFI::DataConverter
    native_type FFI::Type::INT

    RES_RANGE = 0..15

    class << self
      def to_native(value, _context)
        failure unless value.is_a?(Integer) && RES_RANGE.cover?(value)
        value
      end

      private

      def failure
        raise ArgumentError, 
              "resolution must be between #{RES_RANGE.first} and #{RES_RANGE.last}"
      end
    end
  end
end