56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
#ifndef RFL_INTERNAL_NT_TO_PTR_NAMED_TUPLE_HPP_
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#define RFL_INTERNAL_NT_TO_PTR_NAMED_TUPLE_HPP_
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#include <tuple>
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#include "../Field.hpp"
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#include "../make_named_tuple.hpp"
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namespace rfl {
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namespace internal {
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/// Generates a named tuple that contains pointers to the original values in
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/// the struct from a named tuple.
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template <class NamedTupleType, class... AlreadyExtracted>
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auto nt_to_ptr_named_tuple(NamedTupleType& _nt, AlreadyExtracted... _a) {
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using Fields = typename NamedTupleType::Fields;
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constexpr auto i = sizeof...(AlreadyExtracted);
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constexpr auto num_fields = std::tuple_size_v<Fields>;
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if constexpr (i == num_fields) {
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return make_named_tuple(_a...);
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} else {
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using FieldType = typename std::tuple_element<i, Fields>::type;
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using T = std::remove_cvref_t<typename FieldType::Type>;
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return nt_to_ptr_named_tuple(
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_nt, _a..., Field<FieldType::name_, T*>(&std::get<i>(_nt.values()))
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);
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}
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}
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/// Generates a named tuple that contains pointers to the original values in
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/// the struct from a named tuple.
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template <class NamedTupleType, class... AlreadyExtracted>
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auto nt_to_ptr_named_tuple(const NamedTupleType& _nt, AlreadyExtracted... _a) {
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using Fields = typename NamedTupleType::Fields;
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constexpr auto i = sizeof...(AlreadyExtracted);
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constexpr auto num_fields = std::tuple_size_v<Fields>;
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if constexpr (i == num_fields) {
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return make_named_tuple(_a...);
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} else {
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using FieldType = typename std::tuple_element<i, Fields>::type;
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using T = std::remove_cvref_t<typename FieldType::Type>;
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return nt_to_ptr_named_tuple(
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_nt, _a..., Field<FieldType::name_, const T*>(&std::get<i>(_nt.values()))
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);
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}
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}
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} // namespace internal
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} // namespace rfl
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#endif
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