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

 

C++

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技术规范

 

范围库

范围访问
begin cbegin end cend	rbegin crbegin rend crend	size ssize data cdata	empty
范围原语
iterator_tsentinel_t	range_size_trange_difference_t	range_reference_trange_rvalue_reference_t	range_value_t
悬垂迭代器处理
dangling	borrowed_iterator_t	borrowed_subrange_t
范围概念
range borrowed_range    sized_range	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	basic_istream_viewviews::istream
适配器
views::all_tviews::all ref_view owning_view common_viewviews::common reverse_viewviews::reverse views::counted zip_viewviews::zip (C++23)(C++23)	take_viewviews::take take_while_viewviews::take_while drop_viewviews::drop drop_while_viewviews::drop_while zip_transform_viewviews::zip_transform (C++23)(C++23)	elements_viewviews::elements keys_viewviews::keys values_viewviews::values transform_viewviews::transform adjacent_viewviews::adjacent (C++23)(C++23)	filter_viewviews::filter join_viewviews::join split_viewviews::split lazy_split_viewviews::lazy_split adjacent_transform_viewviews::adjacent_transform (C++23)(C++23)
范围适配器对象
范围适配器闭包对象
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()