std::ranges::cartesian_product_view<First, Vs...>::begin

 

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Bereichszugriff begin cbegin   end cend rbegin crbegin   rend crend size ssize   data cdata reserve_hint (C++26)   empty

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range borrowed_range    common_range	sized_range viewable_range    view	input_range output_range forward_range	bidirectional_range    random_access_range contiguous_range	approximately_sized_range (C++26) constant_range (C++23)

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view_interface	subrange

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empty_viewviews::empty	single_viewviews::single	basic_istream_viewviews::istream	iota_viewviews::iota	repeat_viewviews::repeat (C++23)(C++23)

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views::all_tviews::all as_rvalue_viewviews::as_rvalue (C++23)(C++23)   filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while common_viewviews::common views::counted to_input_viewviews::to_input (C++26)(C++26)	ref_view drop_viewviews::drop drop_while_viewviews::drop_while lazy_split_viewviews::lazy_split split_viewviews::split join_viewviews::join join_with_viewviews::join_with (C++23)(C++23)   concat_viewviews::concat (C++26)(C++26) cache_latest_viewviews::cache_latest (C++26)(C++26)	owning_view reverse_viewviews::reverse as_const_viewviews::as_const (C++23)(C++23) elements_viewviews::elements keys_viewviews::keys values_viewviews::values enumerate_viewviews::enumerate (C++23)(C++23) zip_viewviews::zip (C++23)(C++23) zip_transform_viewviews::zip_transform (C++23)(C++23)	adjacent_viewviews::adjacent (C++23)(C++23) views::pairwise (C++23) adjacent_transform_viewviews::adjacent_transform (C++23)(C++23) views::pairwise_transform (C++23) chunk_viewviews::chunk (C++23)(C++23) slide_viewviews::slide (C++23)(C++23) chunk_by_viewviews::chunk_by (C++23)(C++23) stride_viewviews::stride (C++23)(C++23) cartesian_product_viewviews::cartesian_product (C++23)(C++23)

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Hilfselemente
copyable-box movable-box (bis C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::cartesian_product_view

Memberfunktionen

cartesian_product_view::cartesian_product_view

cartesian_product_view::begin

cartesian_product_view::end

cartesian_product_view::size

Deduction Guides

Iterator

Memberfunktionen

cartesian_product_view::iterator::iterator

cartesian_product_view::iterator::operator*

cartesian_product_view::iterator::operator[]

cartesian_product_view::iterator::operator++ cartesian_product_view::iterator::operator++(int) cartesian_product_view::iterator::operator-- cartesian_product_view::iterator::operator--(int) cartesian_product_view::iterator::operator+= cartesian_product_view::iterator::operator-=

cartesian_product_view::iterator::next

cartesian_product_view::iterator::prev

cartesian_product_view::iterator::distance_from

Nicht-Member-Funktionen

operator==(cartesian_product_view::iterator) operator<=>(cartesian_product_view::iterator)

operator+(cartesian_product_view::iterator) operator-(cartesian_product_view::iterator)

iter_move(cartesian_product_view::iterator)

iter_swap(cartesian_product_view::iterator)

 

constexpr iterator<false> begin()     requires (!/*simple-view*/<First> || ... || !/*simple-view*/<Vs>);	(1)	(seit C++23)
constexpr iterator<true> begin() const     requires (ranges::range<const First> && ... && ranges::range<const Vs>);	(2)	(seit C++23)

Gibt einen Iterator zum ersten Element der cartesian_product_view zurück.

Sei bases_ das Tupel der zugrunde liegenden Views.

1) Äquivalent zu return /*iterator*/<false>(tuple-transform(ranges::begin, bases_));.

2) Äquivalent zu return /*iterator*/<true>(tuple-transform(ranges::begin, bases_));.

Parameter

(keine)

Rückgabewert

Ein Iterator zum ersten Element.

Beispiel

Führen Sie diesen Code aus

#include <array>
#include <format>
#include <iostream>
#include <ranges>
#include <string_view>
#include <tuple>
using namespace std::literals;
 
int main()
{
    constexpr auto a = std::array{"Curiously"sv, "Recurring"sv, "Template"sv, "Pattern"sv};
 
    constexpr auto v = std::ranges::cartesian_product_view(a[0], a[1], a[2], a[3]);
 
    constexpr std::tuple<char const&,
                         char const&,
                         char const&,
                         char const&> first{*v.begin()};
 
    std::cout << std::format("{}{}{}{}{}",
                             std::get<0>(first),
                             std::get<1>(first),
                             std::get<2>(first),
                             std::get<3>(first),
                             '\n');
}

Ausgabe

CRTP

Siehe auch

end	gibt einen Iterator oder Sentinel zum Ende zurück (öffentliche Member-Funktion)
ranges::begin (C++20)	gibt einen Iterator zum Anfang eines Ranges zurück (Customization Point Objekt)