71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
#ifndef RFL_INTERNAL_HASFIELDS_HPP_
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#define RFL_INTERNAL_HASFIELDS_HPP_
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#include <tuple>
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#include <type_traits>
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#include <utility>
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#include "all_fields.hpp"
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#include "is_field.hpp"
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#include "is_flatten_field.hpp"
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#include "ptr_tuple_t.hpp"
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namespace rfl {
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namespace internal {
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template <class TupleType, int _i = 0>
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constexpr bool all_fields_or_flatten() {
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if constexpr (_i == std::tuple_size_v<TupleType>) {
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return true;
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} else {
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using T = std::remove_cvref_t<std::tuple_element_t<_i, TupleType>>;
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if constexpr (is_flatten_field_v<T>) {
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return all_fields_or_flatten<ptr_tuple_t<typename std::remove_pointer_t<T>::Type>>() &&
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all_fields_or_flatten<TupleType, _i + 1>();
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} else {
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return is_field_v<T> && all_fields_or_flatten<TupleType, _i + 1>();
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}
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}
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}
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template <class TupleType, int _i = 0>
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constexpr bool some_fields_or_flatten() {
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if constexpr (_i == std::tuple_size_v<TupleType>) {
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return false;
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} else {
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using T = std::remove_cvref_t<std::tuple_element_t<_i, TupleType>>;
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if constexpr (is_flatten_field_v<T>) {
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return some_fields_or_flatten<ptr_tuple_t<typename std::remove_pointer_t<T>::Type>>() ||
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some_fields_or_flatten<TupleType, _i + 1>();
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} else {
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return is_field_v<T> || some_fields_or_flatten<TupleType, _i + 1>();
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}
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}
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}
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template <class T>
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constexpr bool has_fields() {
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if constexpr (is_named_tuple_v<T>) {
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return true;
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} else {
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using TupleType = ptr_tuple_t<T>;
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if constexpr (some_fields_or_flatten<TupleType>()) {
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static_assert(
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all_fields_or_flatten<TupleType>(),
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"If some of your fields are annotated using rfl::Field<...>, "
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"then you must annotate all of your fields. "
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"Also, you cannot combine annotated and "
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"unannotated fields using rfl::Flatten<...>."
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);
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return true;
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} else {
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return false;
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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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