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

 

C++

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功能特性测试宏 (C++20)

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范围访问
begin cbegin end cend	rbegin crbegin rend crend	size ssize data cdata	empty
范围转换器
to (C++23)
范围原语
range_size_trange_difference_t range_value_t	range_reference_trange_const_reference_trange_rvalue_reference_t (C++23)	iterator_tconst_iterator_tsentinel_t (C++23)
悬垂迭代器处理
dangling	borrowed_iterator_t	borrowed_subrange_t
范围概念
range borrowed_range    sized_range constant_range (C++23)	common_range view viewable_range	input_range output_range forward_range	bidirectional_range random_access_range contiguous_range
视图
view_interface	subrange
范围工厂
empty_viewviews::empty single_viewviews::single	iota_viewviews::iota repeat_viewviews::repeat (C++23)(C++23)	basic_istream_viewviews::istream cartesian_product_viewviews::cartesian_product_view (C++23)(C++23)
适配器
views::all_tviews::all ref_view owning_view as_rvalue_viewviews::as_rvalue (C++23)(C++23)   filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while	drop_viewviews::drop drop_while_viewviews::drop_while join_viewviews::join join_with_viewviews::join_with (C++23)(C++23) lazy_split_viewviews::lazy_split split_viewviews::split views::counted common_viewviews::common	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)
范围适配器对象
范围适配器闭包对象
range_adaptor_closure (C++23)
辅助项
copyable-box	simple-view

 

std::ranges::elements_view

成员函数

elements_view::elements_view (C++20)

elements_view::base (C++20)

elements_view::begin (C++20)

elements_view::end (C++20)

elements_view::size (C++20)

嵌套类

迭代器

elements_view::iterator::iterator (C++20)

elements_view::iterator::base (C++20)

elements_view::iterator::operator* (C++20)

elements_view::iterator::operator[] (C++20)

elements_view::iterator::operator++ elements_view::iterator::operator++(int) elements_view::iterator::operator-- elements_view::iterator::operator--(int) elements_view::iterator::operator+= elements_view::iterator::operator-= (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

operator==(elements_view::iterator) operator<(elements_view::iterator) operator>(elements_view::iterator) operator<=(elements_view::iterator) operator>=(elements_view::iterator) operator<=>(elements_view::iterator) (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

operator+(elements_view::iterator) operator-(elements_view::iterator) (C++20)(C++20)

哨位

elements_view::sentinel::sentinel (C++20)

elements_view::sentinel::base (C++20)

operator==(elements_view::iterator,elements_view::sentinel) (C++20)

operator-(elements_view::iterator,elements_view::sentinel) (C++20)

 

friend constexpr /*iterator*/ operator+( const /*iterator*/& i, difference_type n )     requires ranges::random_access_range<Base>;	(1)	(C++20 起)
friend constexpr /*iterator*/ operator+( difference_type n, const /*iterator*/& i )     requires ranges::random_access_range<Base>;	(2)	(C++20 起)
friend constexpr /*iterator*/ operator-( const /*iterator*/& i, difference_type n )     requires ranges::random_access_range<Base>;	(3)	(C++20 起)
friend constexpr difference_type operator-( const /*iterator*/& x,                                             const /*iterator*/& y )     requires std::sized_sentinel_for<ranges::iterator_t<Base>, ranges::iterator_t<Base>>;	(4)	(C++20 起)

1,2) 返回增加 n 的迭代器 i 。

3) 返回减少 n 的迭代器 i

4) 返回 x 与 y 之间的距离。

这些函数对通常无限定或有限定查找不可见，而只能在 elements_view::iterator<Const> 为参数的关联类时由实参依赖查找找到。

参数

i, x, y	-	迭代器
n	-	相对于当前位置的位置

返回值

1-2) [&]{ auto j = i; j += n; return j; }()

3) [&]{ auto j = i; j -= n; return j; }()

4) x.base() - y.base()