Emily Boudreaux
ec13264050
A bug was discovered in glaze which prevented valid toml output. We have switched to toml++ and reflect-cpp. The interface has remained the same so this should not break any code
46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
#ifndef RFL_PARSING_SCHEMAFUL_VARIANTREADER_HPP_
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#define RFL_PARSING_SCHEMAFUL_VARIANTREADER_HPP_
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#include <type_traits>
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#include <utility>
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#include "../../Result.hpp"
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#include "../../internal/nth_element_t.hpp"
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#include "../Parser_base.hpp"
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namespace rfl::parsing::schemaful {
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template <class R, class W, class VariantType, class ProcessorsType,
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class... AlternativeTypes>
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class VariantReader {
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public:
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static Result<VariantType> read(
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const R& _r, const size_t _index,
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const typename R::InputVarType& _var) noexcept {
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return [&]<size_t... _is>(std::integer_sequence<size_t, _is...>) {
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Result<VariantType> result =
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error("Could not parse union: Index out of bounds.");
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(try_one_type<_is>(_r, _index, _var, &result), ...);
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return result;
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}(std::make_integer_sequence<size_t, sizeof...(AlternativeTypes)>());
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}
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private:
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template <size_t _i>
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static void try_one_type(const R& _r, const size_t _index,
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const typename R::InputVarType& _var,
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Result<VariantType>* _result) noexcept {
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if (_index == _i) {
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using T = internal::nth_element_t<_i, AlternativeTypes...>;
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*_result =
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Parser<R, W, std::remove_cvref_t<T>, ProcessorsType>::read(_r, _var)
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.transform(
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[](auto&& _val) -> VariantType { return std::move(_val); });
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}
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}
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};
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} // namespace rfl::parsing::schemaful
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#endif
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