object-introspection/types/std_variant.toml

[info]
typeName = "std::variant"
ctype = "STD_VARIANT_TYPE"
header = "variant"
ns = ["namespace std"]

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

func = """
template <size_t I = 0, class... Types>
void getSizeVariantContents(const %1%<Types...> &container, size_t& returnArg)
{
  if constexpr (I < sizeof...(Types))
  {
    if (I == container.index())
    {
      // Contents are stored inline - don't double count
      SAVE_SIZE(-sizeof(std::get<I>(container)));

      getSizeType(std::get<I>(container), returnArg);
    }
    else
    {
      getSizeVariantContents<I+1>(container, returnArg);
    }
  }
  // else variant is valueless - save no data
}

template<class... Types>
void getSizeType(const %1%<Types...> &container, size_t& returnArg)
{
  SAVE_SIZE(sizeof(%1%<Types...>));

  SAVE_DATA(container.index());
  getSizeVariantContents(container, returnArg);
}
"""