80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
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#ifndef RFL_INTERNAL_TO_PTR_NAMED_TUPLE_HPP_
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#define RFL_INTERNAL_TO_PTR_NAMED_TUPLE_HPP_
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#include <iostream>
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#include <tuple>
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#include "../always_false.hpp"
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#include "../field_names_t.hpp"
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#include "../make_named_tuple.hpp"
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#include "copy_flattened_tuple_to_named_tuple.hpp"
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#include "has_fields.hpp"
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#include "has_flatten_fields.hpp"
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#include "is_empty.hpp"
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#include "is_field.hpp"
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#include "is_named_tuple.hpp"
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#include "to_flattened_ptr_tuple.hpp"
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#include "to_ptr_field_tuple.hpp"
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namespace rfl {
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namespace internal {
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template <class PtrFieldTuple, class... Args>
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auto flatten_ptr_field_tuple(PtrFieldTuple& _t, Args&&... _args) {
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constexpr auto i = sizeof...(Args);
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if constexpr (i == std::tuple_size_v<std::remove_cvref_t<PtrFieldTuple>>) {
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return std::tuple_cat(std::forward<Args>(_args)...);
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} else {
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using T = std::tuple_element_t<i, std::remove_cvref_t<PtrFieldTuple>>;
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if constexpr (internal::is_flatten_field<T>::value) {
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auto subtuple = internal::to_ptr_field_tuple(*std::get<i>(_t).get());
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return flatten_ptr_field_tuple(_t, std::forward<Args>(_args)...,
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flatten_ptr_field_tuple(subtuple));
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} else {
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return flatten_ptr_field_tuple(_t, std::forward<Args>(_args)...,
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std::make_tuple(std::get<i>(_t)));
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}
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}
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}
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template <class PtrFieldTuple>
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auto field_tuple_to_named_tuple(PtrFieldTuple& _ptr_field_tuple) {
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const auto ft_to_nt = []<class... Fields>(Fields&&... _fields) {
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return make_named_tuple(_fields...);
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};
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if constexpr (!has_flatten_fields<std::remove_cvref_t<PtrFieldTuple>>()) {
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return std::apply(ft_to_nt, std::move(_ptr_field_tuple));
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} else {
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const auto flattened_tuple = flatten_ptr_field_tuple(_ptr_field_tuple);
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return std::apply(ft_to_nt, flattened_tuple);
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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.
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template <class T>
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auto to_ptr_named_tuple(T&& _t) {
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if constexpr (has_fields<std::remove_cvref_t<T>>()) {
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if constexpr (std::is_pointer_v<std::remove_cvref_t<T>>) {
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return to_ptr_named_tuple(*_t);
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} else if constexpr (is_named_tuple_v<std::remove_cvref_t<T>>) {
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return nt_to_ptr_named_tuple(_t);
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} else {
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auto ptr_field_tuple = to_ptr_field_tuple(_t);
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return field_tuple_to_named_tuple(ptr_field_tuple);
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}
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} else if constexpr (is_empty<T>()) {
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return rfl::NamedTuple<>();
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} else {
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using FieldNames = rfl::field_names_t<T>;
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auto flattened_ptr_tuple = to_flattened_ptr_tuple(_t);
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return copy_flattened_tuple_to_named_tuple<FieldNames>(flattened_ptr_tuple);
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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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