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

 

C++

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功能特性测试宏 (C++20)

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概念库 (C++20)

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元编程库 (C++11)

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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 (C++23 前)  (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)

 

friend constexpr /*iterator*/ operator+( const /*iterator*/& i, difference_type n ) requires /*cartesian-product-is-random-access*/<Const, First, Vs...>;	(1)	(C++23 起)
friend constexpr /*iterator*/ operator+( difference_type n, const /*iterator*/& i ) requires /*cartesian-product-is-random-access*/<Const, First, Vs...>;	(2)	(C++23 起)
friend constexpr /*iterator*/ operator-( const /*iterator*/& i, difference_type n ) requires /*cartesian-product-is-random-access*/<Const, First, Vs...>;	(3)	(C++23 起)
friend constexpr difference_type operator-( const /*iterator*/& i, const /*iterator*/& j ) requires /*cartesian-is-sized-sentinel*/<Const, iterator_t, First, Vs...>;	(4)	(C++23 起)
friend constexpr difference_type operator-( const /*iterator*/& i, std::default_sentinel_t ) requires /*cartesian-is-sized-sentinel*/<Const, ranges::sentinel_t, First, Vs...>;	(5)	(C++23 起)
friend constexpr difference_type operator-( std::default_sentinel_t s, const /*iterator*/& i ) requires /*cartesian-is-sized-sentinel*/<Const, ranges::sentinel_t, First, Vs...>;	(6)	(C++23 起)

对迭代器施加算术运算或计算其距离。

令 current_ 代表底层的迭代器元组，并令 parent_ 代表指向 cartesian_product_view 的底层指针。

1) 等价于：return /*iterator*/(i) += n;。

2) 等价于：return i + n;。

3) 等价于：return /*iterator*/(i) -= n;。

4) 等价于：return i.distance_from(j.current_);。

5) 令 /*end-tuple*/ 是类型为 std::tuple 的某个特化的对象，使得：

• std::get<0>(/*end-tuple*/) 和 ranges::end(std::get<0>(i.parent_->bases_)); 有相同值
• 对于每个整数 1 ≤ N ≤ sizeof...(Vs)，std::get<N>(/*end-tuple*/) 和 ranges::begin(std::get<N>(i.parent_->bases_)) 有相同值

等价于：return i.distance_from(/*end-tuple*/);。

6) 等价于：return -(i - s);。

这些函数对常规的无限定或有限定查找不可见，而只能在 cartesian_product_view::iterator<Const> 为实参的关联类时由实参依赖查找找到。

参数

i, j	-	迭代器
n	-	相对当前位置的偏移
s	-	哨位

返回值

1,2) 增加后的迭代器

3) 减少后的迭代器

4) 给定迭代器之间的距离

5,6) 给定迭代器和哨位之间的距离

参阅

operator++operator++(int)operator--operator--(int)operator+=operator-=

推进或减小底层迭代器 (公开成员函数)