[info]
type_name = "folly::Optional"
ctype = "FOLLY_OPTIONAL_TYPE"
header = "folly/Optional.h"

# Old:
typeName = "folly::Optional<"
ns = ["folly::Optional"]
numTemplateParams = 1
replaceTemplateParamIndex = []

[codegen]
decl = """
template<typename T>
void getSizeType(const %1%<T> &container, size_t& returnArg);
"""

func = """
template <typename T>
void getSizeType(const %1%<T>& container, size_t& returnArg) {
  if (container) {
    SAVE_SIZE(sizeof(%1%<T>) - sizeof(T));
    SAVE_DATA((uintptr_t)(container.get_pointer()));

    getSizeType(*(container.get_pointer()), returnArg);
  } else {
    SAVE_SIZE(sizeof(%1%<T>));
    SAVE_DATA(0);
  }
}
"""

traversal_func = """
if (container.has_value()) {
  return returnArg.template delegate<1>([&ctx, &container](auto ret) {
    return OIInternal::getSizeType<Ctx>(ctx, *container, ret);
  });
} else {
  return returnArg.template delegate<0>(std::identity());
}
"""

[[codegen.processor]]
type = "types::st::Sum<DB, types::st::Unit<DB>, typename TypeHandler<Ctx, T0>::type>"
func = """
static constexpr auto elementField = make_field<Ctx, T0>("el");

auto sum = std::get<ParsedData::Sum>(d.val);

el.container_stats = result::Element::ContainerStats {
  .capacity = 1,
  .length = sum.index,
};

if (sum.index == 1) {
  el.exclusive_size -= sizeof(T0);
  stack_ins(elementField);
}
"""