mirror of
https://github.com/JakeHillion/object-introspection.git
synced 2024-09-19 19:19:05 +01:00
69 lines
2.0 KiB
TOML
69 lines
2.0 KiB
TOML
[info]
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type_name = "std::variant"
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ctype = "STD_VARIANT_TYPE"
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header = "variant"
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# Old:
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typeName = "std::variant"
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ns = ["namespace std"]
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[codegen]
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decl = """
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template<class... Types>
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void getSizeType(const %1%<Types...> &container, size_t& returnArg);
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"""
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func = """
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template<class... Types>
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void getSizeType(const %1%<Types...> &container, size_t& returnArg)
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{
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SAVE_SIZE(sizeof(%1%<Types...>));
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SAVE_DATA(container.index());
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// This check should be `container.valueless_by_exception()` but it doesn't
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// work with the variable sized integers used in `std::variant`. For fewer
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// than 256 options it uses a `uint8_t` index but checks against -1 of
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// `uintptr_t`. Manually check for any out of bounds indices as a workaround.
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if (container.index() >= sizeof...(Types)) {
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return;
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}
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std::visit([&returnArg](auto &&arg) {
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// Account for inline contents
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SAVE_SIZE(-sizeof(arg));
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getSizeType(arg, returnArg);
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}, container);
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}
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"""
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handler = """
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template <typename DB, typename... Types>
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struct TypeHandler<DB, %1%<Types...>> {
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using type = types::st::Sum<DB, typename TypeHandler<DB, Types>::type..., types::st::Unit<DB>>;
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static types::st::Unit<DB> getSizeType(
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const %1%<Types...>& container,
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typename TypeHandler<DB, %1%<Types...>>::type returnArg) {
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return getSizeTypeRecursive(container, returnArg);
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}
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private:
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template <size_t I = 0>
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static types::st::Unit<DB> getSizeTypeRecursive(
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const %1%<Types...>& container,
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typename TypeHandler<DB, %1%<Types...>>::type returnArg) {
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if constexpr (I < sizeof...(Types)) {
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if (I == container.index()) {
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return returnArg.template delegate<I>([&container](auto ret) {
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return OIInternal::getSizeType<DB>(std::get<I>(container), ret);
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});
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} else {
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return getSizeTypeRecursive<I+1>(container, returnArg);
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}
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} else {
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return returnArg.template delegate<sizeof...(Types)>(std::identity());
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}
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}
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};
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"""
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