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

 

C++

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特性测试宏 (C++20)

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技术规范

符号索引

外部库

 

范围库 (Ranges library)

范围访问 开始 cbegin   结束 cend rbegin crbegin   rend crend 大小 ssize   数据 cdata reserve_hint (C++26)   空

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

悬空迭代器处理 (Dangling iterator handling) 悬垂 borrowed_iterator_t borrowed_subrange_t

范围原语 (Range primitives)
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 concepts)
范围 借用范围    common_range	有大小范围 可视图范围    视图	输入范围 输出范围 向前范围	双向范围    随机访问范围 连续范围	近似大小范围 (C++26) 常量范围 (C++23)

视图
视图接口	子范围

范围工厂 (Range factories)
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 (Range adaptors)
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 (Range generators) std::generator (C++23)

范围适配器闭包对象 (Range adaptor closure objects) range_adaptor_closure (C++23)

范围适配器对象 (Range adaptor objects)

辅助项 (Helper items)
copyable-box movable-box (直到 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 (Iterator)

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)

 

friend constexpr bool operator==( const /*iterator*/& x, const /*iterator*/& y )     requires std::equality_comparable<ranges::iterator_t</*maybe-const*/<Const, First>>>;	(1)	(C++23 起)
friend constexpr bool operator==( const /*iterator*/& x, std::default_sentinel_t );	(2)	(C++23 起)
friend constexpr auto operator<=>( const /*iterator*/& x, const /*iterator*/& y )     requires /*all-random-access*/<Const, First, Vs...>;	(2)	(C++23 起)

比较两个迭代器，或一个迭代器和一个哨位。

令 current_ 代表底层的迭代器元组。

1) 等价于：return x.current_ == y.current_;

2) 若对于任意整数 0 ≤ i ≤ sizeof...(Vs)，std::get<i>(x.current_) == ranges::end(std::get<i>(x.parent_->bases_)) 为 true，则返回 true。否则返回 false。

3) 等价于：return x.current_ <=> y.current_;

这些函数对通常的无限定或限定查找不可见，只能在 std::ranges::cartesian_product_view::iterator<Const> 是参数的关联类时通过实参依赖查找找到。

!= 运算符由 operator== 合成。

参数

x, y

-

要比较的迭代器或哨位

返回值

比较结果。

参阅

operator== (C++23)

将哨位与 cartesian_product_view::begin 所返回的迭代器进行比较 (函数)