std::ranges::cartesian_product_view<First, Vs...>::iterator<Const>::next, std::ranges::cartesian_product_view<First, Vs...>::iterator<Const>::prev, std::ranges::cartesian_product_view<First, Vs...>::iterator<Const>::distance_from

 

C++

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Feature test macros (C++20)

语言支持库

Concepts library (C++20)

诊断库

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Metaprogramming library (C++11)

通用工具库

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迭代器库

Ranges library (C++20)

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Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (C++26)

技术规范

符号索引

外部库

 

范围库

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

范围转换 std::from_range_t std::from_range (C++23)(C++23)     to (C++23)

悬垂迭代器处理 dangling borrowed_iterator_t borrowed_subrange_t

范围原语
range_size_trange_difference_trange_value_t elements_of (C++23)	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_reference_trange_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)

范围概念
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)

视图
view_interface	subrange

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

范围适配器
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)

范围生成器 std::generator (C++23)

范围适配器闭包对象 range_adaptor_closure (C++23)

范围适配器对象

辅助项
copyable-box movable-box (until C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::cartesian_product_view

成员函数

cartesian_product_view::cartesian_product_view

cartesian_product_view::begin

cartesian_product_view::end

cartesian_product_view::size

推导指引

迭代器

成员函数

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

非成员函数

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)

 

std::ranges::cartesian_product_view::iterator::next

template< std::size_t N = sizeof...(Vs) > constexpr void /*next*/();		(since C++23) (仅为阐释目的*)

如果使用默认模板参数调用，则递归地生成 cartesian_product_view 中的下一个元素（迭代器元组）。

设 current_ 表示底层的迭代器元组。等价于

auto& it = std::get<N>(current_);
++it;
if constexpr (N > 0)
{
    if (it == ranges::end(std::get<N>(parent_->bases_)))
    {
        it = ranges::begin(std::get<N>(parent_->bases_));
        next<N - 1>();
    }
}

用于以下非静态成员函数

• ranges::cartesian_product_view::operator+

std::ranges::cartesian_product_view::iterator::prev

template< std::size_t N = sizeof...(Vs) > constexpr void /*prev*/();		(since C++23) (仅为阐释目的*)

如果使用默认模板参数调用，则递归地生成 cartesian_product_view 中的上一个元素（迭代器元组）。

设 current_ 表示底层的迭代器元组。等价于

auto& it = std::get<N>(current_);
if constexpr (N > 0)
{
    if (it == ranges::begin(std::get<N>(parent_->bases_)))
    {
        it = /*cartesian-common-arg-end*/(std::get<N>(parent_->bases_));
        prev<N - 1>();
    }
}
--it;

用于以下非静态成员函数

• ranges::cartesian_product_view::operator-

std::ranges::cartesian_product_view::iterator::distance_from

template< class Tuple > constexpr difference_type     /*distance-from*/( const Tuple& t ) const;		(since C++23) (仅为阐释目的*)

返回两个 迭代器 之间的“距离”（即“跳数”）。

设

• parent_ 为指向 cartesian_product_view 的底层指针
• /*scaled-size*/(N) 为
  • 如果 N ≤ sizeof...(Vs)，则为 static_cast<difference_type>(ranges::size(std::get<N>(parent_->bases_))) 和 /*scaled-size*/(N + 1) 的乘积，否则
  • static_cast<difference_type>(1);
• /*scaled-distance*/(N) 为 static_cast<difference_type>(std::get<N>(current_) - std::get<N>(t)) 和 /*scaled-size*/(N + 1); 的乘积；
• /*scaled-sum*/ 为每个整数 0 ≤ N ≤ sizeof...(Vs) 的 /*scaled-distance*/(N) 之和。

返回值：/*scaled-sum*/。

如果 /*scaled-sum*/ 无法由 difference_type 表示，则行为未定义。

用于以下函数

• operator-(const /*iterator*/&, const /*iterator*/&)
• operator-(const /*iterator*/&, std::default_sentinel_t)

参数

t

-

用于查找距离的迭代器元组