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Amar Mahmutbegovic
447
Chapter17/cib/libs/stdx/tuple_algorithms.hpp
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447
Chapter17/cib/libs/stdx/tuple_algorithms.hpp
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#pragma once
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#if __cplusplus >= 202002L
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#include <stdx/ct_conversions.hpp>
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#include <stdx/tuple.hpp>
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#include <stdx/type_traits.hpp>
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#include <boost/mp11/algorithm.hpp>
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#include <algorithm>
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#include <array>
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#include <cstddef>
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#include <type_traits>
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#include <utility>
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namespace stdx {
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inline namespace v1 {
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template <typename F, tuplelike... Ts> constexpr auto apply(F &&f, Ts &&...ts) {
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constexpr auto total_num_elements =
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(std::size_t{} + ... + stdx::tuple_size_v<std::remove_cvref_t<Ts>>);
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[[maybe_unused]] constexpr auto element_indices = [&] {
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std::array<detail::index_pair, total_num_elements> indices{};
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[[maybe_unused]] auto p = indices.data();
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((p = std::remove_cvref_t<Ts>::fill_inner_indices(p)), ...);
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[[maybe_unused]] auto q = indices.data();
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[[maybe_unused]] std::size_t n{};
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((q = std::remove_cvref_t<Ts>::fill_outer_indices(q, n++)), ...);
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return indices;
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}();
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[[maybe_unused]] auto outer_tuple =
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stdx::tuple<Ts &&...>{std::forward<Ts>(ts)...};
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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return std::forward<F>(f)(
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std::move(outer_tuple)[index<element_indices[Is].outer>]
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[index<element_indices[Is].inner>]...);
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}(std::make_index_sequence<total_num_elements>{});
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}
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template <tuplelike... Ts> [[nodiscard]] constexpr auto tuple_cat(Ts &&...ts) {
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if constexpr (sizeof...(Ts) == 0) {
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return stdx::tuple<>{};
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} else if constexpr (sizeof...(Ts) == 1) {
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return (ts, ...);
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} else {
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constexpr auto total_num_elements =
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(std::size_t{} + ... + stdx::tuple_size_v<std::remove_cvref_t<Ts>>);
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[[maybe_unused]] constexpr auto element_indices = [&] {
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std::array<detail::index_pair, total_num_elements> indices{};
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auto p = indices.data();
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((p = std::remove_cvref_t<Ts>::fill_inner_indices(p)), ...);
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auto q = indices.data();
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std::size_t n{};
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((q = std::remove_cvref_t<Ts>::fill_outer_indices(q, n++)), ...);
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return indices;
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}();
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[[maybe_unused]] auto outer_tuple =
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stdx::tuple<Ts &&...>{std::forward<Ts>(ts)...};
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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using T = stdx::tuple<stdx::tuple_element_t<
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element_indices[Is].inner,
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std::remove_cvref_t<decltype(std::move(
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outer_tuple)[index<element_indices[Is].outer>])>>...>;
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return T{
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std::move(outer_tuple)[index<element_indices[Is].outer>]
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[index<element_indices[Is].inner>]...};
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}(std::make_index_sequence<total_num_elements>{});
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}
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}
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template <typename T, tuplelike Tup>
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[[nodiscard]] constexpr auto tuple_cons(T &&t, Tup &&tup) {
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using tuple_t = std::remove_cvref_t<Tup>;
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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return stdx::tuple<std::remove_cvref_t<T>,
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stdx::tuple_element_t<Is, tuple_t>...>{
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std::forward<T>(t), std::forward<Tup>(tup)[index<Is>]...};
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}(std::make_index_sequence<stdx::tuple_size_v<tuple_t>>{});
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}
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template <tuplelike Tup, typename T>
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[[nodiscard]] constexpr auto tuple_snoc(Tup &&tup, T &&t) {
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using tuple_t = std::remove_cvref_t<Tup>;
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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return stdx::tuple<stdx::tuple_element_t<Is, tuple_t>...,
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std::remove_cvref_t<T>>{
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std::forward<Tup>(tup)[index<Is>]..., std::forward<T>(t)};
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}(std::make_index_sequence<stdx::tuple_size_v<tuple_t>>{});
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}
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template <typename T, tuplelike Tup>
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[[nodiscard]] constexpr auto tuple_push_front(T &&t,
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Tup &&tup) -> decltype(auto) {
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return tuple_cons(std::forward<T>(t), std::forward<Tup>(tup));
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}
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template <tuplelike Tup, typename T>
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[[nodiscard]] constexpr auto tuple_push_back(Tup &&tup,
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T &&t) -> decltype(auto) {
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return tuple_snoc(std::forward<Tup>(tup), std::forward<T>(t));
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}
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template <template <typename T> typename Pred, tuplelike T>
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[[nodiscard]] constexpr auto filter(T &&t) {
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using tuple_t = std::remove_cvref_t<T>;
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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constexpr auto num_matches =
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(std::size_t{} + ... +
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(Pred<stdx::tuple_element_t<Is, tuple_t>>::value ? std::size_t{1}
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: std::size_t{}));
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constexpr auto indices = [] {
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auto a = std::array<std::size_t, num_matches>{};
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[[maybe_unused]] auto it = a.begin();
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[[maybe_unused]] auto copy_index =
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[&]<std::size_t I, typename Elem> {
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if constexpr (Pred<Elem>::value) {
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*it++ = I;
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}
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};
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(copy_index
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.template operator()<Is, stdx::tuple_element_t<Is, tuple_t>>(),
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...);
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return a;
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}();
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return [&]<std::size_t... Js>(std::index_sequence<Js...>) {
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using R =
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stdx::tuple<stdx::tuple_element_t<indices[Js], tuple_t>...>;
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return R{std::forward<T>(t)[index<indices[Js]>]...};
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}(std::make_index_sequence<num_matches>{});
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}(std::make_index_sequence<stdx::tuple_size_v<tuple_t>>{});
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}
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namespace detail {
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template <std::size_t I, typename... Ts>
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constexpr auto invoke_at(auto &&op, Ts &&...ts) -> decltype(auto) {
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return op(std::forward<Ts>(ts)[index<I>]...);
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}
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template <typename... Ts>
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constexpr std::size_t zip_length_for =
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sizeof...(Ts) == 0
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? 0
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: std::min({stdx::tuple_size_v<std::remove_cvref_t<Ts>>...});
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} // namespace detail
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template <template <typename> typename... Fs, typename Op, tuplelike... Ts>
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constexpr auto transform(Op &&op, Ts &&...ts) {
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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if constexpr (sizeof...(Fs) == 0) {
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return stdx::tuple<decltype(detail::invoke_at<Is>(
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std::forward<Op>(op), std::forward<Ts>(ts)...))...>{
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detail::invoke_at<Is>(std::forward<Op>(op),
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std::forward<Ts>(ts)...)...};
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} else {
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return stdx::make_indexed_tuple<Fs...>(detail::invoke_at<Is>(
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std::forward<Op>(op), std::forward<Ts>(ts)...)...);
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}
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}(std::make_index_sequence<detail::zip_length_for<Ts...>>{});
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}
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template <typename Op, typename... Ts>
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constexpr auto unrolled_for_each(Op &&op, Ts &&...ts) -> Op {
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[&]<std::size_t... Is>(std::index_sequence<Is...>) {
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(detail::invoke_at<Is>(op, std::forward<Ts>(ts)...), ...);
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}(std::make_index_sequence<detail::zip_length_for<Ts...>>{});
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return op;
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}
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template <typename Op, tuplelike... Ts>
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constexpr auto for_each(Op &&op, Ts &&...ts) -> Op {
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return unrolled_for_each(std::forward<Op>(op), std::forward<Ts>(ts)...);
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}
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namespace detail {
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template <std::size_t I, typename... Ts>
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constexpr auto invoke_with_idx_at(auto &&op, Ts &&...ts) -> decltype(auto) {
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return op.template operator()<I>(std::forward<Ts>(ts)[index<I>]...);
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}
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} // namespace detail
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template <typename Op, typename... Ts>
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constexpr auto unrolled_enumerate(Op &&op, Ts &&...ts) -> Op {
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[&]<std::size_t... Is>(std::index_sequence<Is...>) {
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(detail::invoke_with_idx_at<Is>(op, std::forward<Ts>(ts)...), ...);
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}(std::make_index_sequence<detail::zip_length_for<Ts...>>{});
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return op;
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}
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template <typename Op, tuplelike... Ts>
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constexpr auto enumerate(Op &&op, Ts &&...ts) -> Op {
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return unrolled_enumerate(std::forward<Op>(op), std::forward<Ts>(ts)...);
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}
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template <typename F, tuplelike... Ts>
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constexpr auto all_of(F &&f, Ts &&...ts) -> bool {
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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return (... and detail::invoke_at<Is>(f, std::forward<Ts>(ts)...));
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}(std::make_index_sequence<detail::zip_length_for<Ts...>>{});
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}
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template <typename F, tuplelike... Ts>
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constexpr auto any_of(F &&f, Ts &&...ts) -> bool {
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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return (... or detail::invoke_at<Is>(f, std::forward<Ts>(ts)...));
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}(std::make_index_sequence<detail::zip_length_for<Ts...>>{});
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}
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template <typename... Ts> constexpr auto none_of(Ts &&...ts) -> bool {
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return not any_of(std::forward<Ts>(ts)...);
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}
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namespace detail {
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template <typename T, template <typename> typename F, typename... Us>
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constexpr auto is_index_for = (std::is_same_v<F<Us>, T> or ...);
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template <typename T, typename IndexSeq, template <typename> typename... Fs,
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typename... Us>
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constexpr auto contains_type(
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stdx::detail::tuple_impl<IndexSeq, index_function_list<Fs...>, Us...> const
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&) -> std::bool_constant<(is_index_for<T, Fs, Us...> or ...) or
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(std::is_same_v<T, Us> or ...)>;
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template <tuplelike T, template <typename> typename Proj = std::type_identity_t>
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[[nodiscard]] constexpr auto sorted_indices() {
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return []<std::size_t... Is>(std::index_sequence<Is...>)
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-> std::array<std::size_t, sizeof...(Is)> {
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using P = std::pair<std::string_view, std::size_t>;
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auto a = std::array<P, sizeof...(Is)>{
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P{stdx::type_as_string<Proj<tuple_element_t<Is, T>>>(), Is}...};
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std::sort(a.begin(), a.end(), [](auto const &p1, auto const &p2) {
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return p1.first < p2.first;
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});
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return {a[Is].second...};
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}
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(std::make_index_sequence<T::size()>{});
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}
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} // namespace detail
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template <tuplelike Tuple, typename T>
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constexpr auto contains_type =
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decltype(detail::contains_type<T>(std::declval<Tuple>()))::value;
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template <template <typename> typename Proj = std::type_identity_t,
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tuplelike Tuple>
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[[nodiscard]] constexpr auto sort(Tuple &&t) {
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using T = stdx::remove_cvref_t<Tuple>;
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constexpr auto indices = detail::sorted_indices<T, Proj>();
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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return stdx::tuple<tuple_element_t<indices[Is], T>...>{
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std::forward<Tuple>(t)[index<indices[Is]>]...};
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}(std::make_index_sequence<T::size()>{});
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}
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namespace detail {
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template <tuplelike T, template <typename> typename Proj> struct test_pair_t {
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template <std::size_t I, std::size_t J>
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constexpr static auto value =
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std::is_same_v<Proj<stdx::tuple_element_t<I, T>>,
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Proj<stdx::tuple_element_t<J, T>>>;
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};
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template <tuplelike T, template <typename> typename Proj = std::type_identity_t>
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requires(tuple_size_v<T> > 1)
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[[nodiscard]] constexpr auto count_chunks() {
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auto count = std::size_t{1};
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[&]<std::size_t... Is>(std::index_sequence<Is...>) {
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((count += static_cast<std::size_t>(
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not test_pair_t<T, Proj>::template value<Is, Is + 1>)),
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...);
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}(std::make_index_sequence<stdx::tuple_size_v<T> - 1>{});
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return count;
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}
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struct chunk {
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std::size_t offset{};
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std::size_t size{};
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friend constexpr auto operator==(chunk const &,
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chunk const &) -> bool = default;
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};
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template <tuplelike T, template <typename> typename Proj = std::type_identity_t>
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requires(tuple_size_v<T> > 1)
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[[nodiscard]] constexpr auto create_chunks() {
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auto index = std::size_t{};
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std::array<chunk, count_chunks<T, Proj>()> chunks{};
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++chunks[index].size;
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auto check_next_chunk = [&]<std::size_t I>() {
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if (not test_pair_t<T, Proj>::template value<I, I + 1>) {
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chunks[++index].offset = I + 1;
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}
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++chunks[index].size;
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};
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[&]<std::size_t... Is>(std::index_sequence<Is...>) {
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(check_next_chunk.template operator()<Is>(), ...);
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}(std::make_index_sequence<stdx::tuple_size_v<T> - 1>{});
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return chunks;
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}
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} // namespace detail
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template <template <typename> typename Proj = std::type_identity_t,
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tuplelike Tuple>
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[[nodiscard]] constexpr auto chunk_by(Tuple &&t) {
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using tuple_t = std::remove_cvref_t<Tuple>;
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if constexpr (tuple_size_v<tuple_t> == 0) {
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return stdx::tuple{};
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} else if constexpr (tuple_size_v<tuple_t> == 1) {
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return stdx::make_tuple(std::forward<Tuple>(t));
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} else {
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constexpr auto chunks = detail::create_chunks<tuple_t, Proj>();
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return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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return stdx::make_tuple(
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[&]<std::size_t... Js>(std::index_sequence<Js...>) {
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constexpr auto offset = chunks[Is].offset;
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return stdx::tuple<tuple_element_t<
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offset + Js, stdx::remove_cvref_t<Tuple>>...>{
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std::forward<Tuple>(t)[index<offset + Js>]...};
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}(std::make_index_sequence<chunks[Is].size>{})...);
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}(std::make_index_sequence<chunks.size()>{});
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}
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}
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template <tuplelike Tuple> [[nodiscard]] constexpr auto chunk(Tuple &&t) {
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return chunk_by(std::forward<Tuple>(t));
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}
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template <tuplelike... Ts> constexpr auto cartesian_product_copy(Ts &&...ts) {
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if constexpr (sizeof...(Ts) == 0) {
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return make_tuple(tuple{});
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} else {
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return []<typename First, typename... Rest>(First &&first,
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Rest &&...rest) {
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auto const c = cartesian_product_copy(std::forward<Rest>(rest)...);
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return std::forward<First>(first).apply([&]<typename... Elems>(
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Elems &&...elems) {
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[[maybe_unused]] auto const prepend = [&]<typename E>(E &&e) {
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return c.apply([&](auto... subs) {
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return make_tuple(
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tuple_cat(make_tuple(std::forward<E>(e)), subs)...);
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});
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};
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return tuple_cat(prepend(std::forward<Elems>(elems))...);
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});
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}(std::forward<Ts>(ts)...);
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}
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}
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template <tuplelike... Ts> constexpr auto cartesian_product(Ts &&...ts) {
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if constexpr (sizeof...(Ts) == 0) {
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return make_tuple(tuple{});
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} else {
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return []<typename First, typename... Rest>(First &&first,
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Rest &&...rest) {
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auto const c = cartesian_product(std::forward<Rest>(rest)...);
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return std::forward<First>(first).apply(
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[&]<typename... Elems>(Elems &&...elems) {
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auto const prepend = [&]<typename E>(E &&e) {
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return c.apply([&](auto... subs) {
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return make_tuple(tuple_cat(
|
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forward_as_tuple(std::forward<E>(e)), subs)...);
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});
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};
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return tuple_cat(prepend(std::forward<Elems>(elems))...);
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});
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}(std::forward<Ts>(ts)...);
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}
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}
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template <tuplelike T> constexpr auto unique(T &&t) {
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return chunk(std::forward<T>(t)).apply([]<typename... Us>(Us &&...us) {
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return tuple<tuple_element_t<0, Us>...>{
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||||
get<0>(std::forward<Us>(us))...};
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||||
});
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||||
}
|
||||
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template <tuplelike T> constexpr auto to_sorted_set(T &&t) {
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return unique(sort(std::forward<T>(t)));
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||||
}
|
||||
|
||||
template <tuplelike Tuple> constexpr auto to_unsorted_set(Tuple &&t) {
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using T = stdx::remove_cvref_t<Tuple>;
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||||
using U = boost::mp11::mp_unique<T>;
|
||||
return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
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return U{get<boost::mp11::mp_find<T, tuple_element_t<Is, U>>::value>(
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||||
std::forward<Tuple>(t))...};
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||||
}(std::make_index_sequence<U::size()>{});
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||||
}
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||||
|
||||
template <template <typename> typename Proj = std::type_identity_t,
|
||||
tuplelike Tuple>
|
||||
[[nodiscard]] constexpr auto gather_by(Tuple &&t) {
|
||||
using tuple_t = std::remove_cvref_t<Tuple>;
|
||||
if constexpr (tuple_size_v<tuple_t> == 0) {
|
||||
return stdx::tuple{};
|
||||
} else if constexpr (tuple_size_v<tuple_t> == 1) {
|
||||
return stdx::make_tuple(std::forward<Tuple>(t));
|
||||
} else {
|
||||
constexpr auto sorted_idxs = detail::sorted_indices<tuple_t, Proj>();
|
||||
constexpr auto tests =
|
||||
[&]<std::size_t... Is>(std::index_sequence<Is...>) {
|
||||
return std::array<bool, stdx::tuple_size_v<tuple_t> - 1>{
|
||||
detail::test_pair_t<tuple_t, Proj>::template value<
|
||||
sorted_idxs[Is], sorted_idxs[Is + 1]>...};
|
||||
}(std::make_index_sequence<stdx::tuple_size_v<tuple_t> - 1>{});
|
||||
|
||||
constexpr auto chunks = [&] {
|
||||
constexpr auto chunk_count =
|
||||
std::count(std::begin(tests), std::end(tests), false) + 1;
|
||||
std::array<detail::chunk, chunk_count> cs{};
|
||||
|
||||
auto index = std::size_t{};
|
||||
++cs[index].size;
|
||||
for (auto i = std::size_t{}; i < std::size(tests); ++i) {
|
||||
if (not tests[i]) {
|
||||
cs[++index].offset = i + 1;
|
||||
}
|
||||
++cs[index].size;
|
||||
}
|
||||
return cs;
|
||||
}();
|
||||
|
||||
return [&]<std::size_t... Is>(std::index_sequence<Is...>) {
|
||||
return stdx::make_tuple([&]<std::size_t... Js>(
|
||||
std::index_sequence<Js...>) {
|
||||
constexpr auto offset = chunks[Is].offset;
|
||||
return stdx::tuple<
|
||||
tuple_element_t<sorted_idxs[offset + Js], tuple_t>...>{
|
||||
std::forward<Tuple>(t)[index<sorted_idxs[offset + Js]>]...};
|
||||
}(std::make_index_sequence<chunks[Is].size>{})...);
|
||||
}(std::make_index_sequence<chunks.size()>{});
|
||||
}
|
||||
}
|
||||
|
||||
template <tuplelike Tuple> [[nodiscard]] constexpr auto gather(Tuple &&t) {
|
||||
return gather_by(std::forward<Tuple>(t));
|
||||
}
|
||||
} // namespace v1
|
||||
} // namespace stdx
|
||||
|
||||
#endif
|
||||
Reference in New Issue
Block a user