std::ranges::enumerate_view<V>::iterator<Const>::operator++,--,+=,-=

 

C++

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自立实现与有宿主实现

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具名要求

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)

通用工具库

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文件系统库 (C++17)

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执行控制库 (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 (C++23 前)  (C++23)	simple-view non-propagating-cache

 

std::ranges::enumerate_view

成员函数

enumerate_view::enumerate_view

enumerate_view::base

enumerate_view::begin

enumerate_view::end

enumerate_view::size

enumerate_view::reserve_hint (C++26)

推导指引

嵌套类

迭代器

Iterator

enumerate_view::iterator::iterator

enumerate_view::iterator::base

enumerate_view::iterator::index

enumerate_view::iterator::operator*

enumerate_view::iterator::operator[]

enumerate_view::iterator::operator++ enumerate_view::iterator::operator++(int) enumerate_view::iterator::operator-- enumerate_view::iterator::operator--(int) enumerate_view::iterator::operator+= enumerate_view::iterator::operator-=

operator==(enumerate_view::iterator) operator<=>(enumerate_view::iterator)

operator+(enumerate_view::iterator) operator-(enumerate_view::iterator)

iter_move(enumerate_view::iterator)

哨位

enumerate_view::sentinel::sentinel

enumerate_view::sentinel::base

operator==(enumerate_view::iterator,enumerate_view::sentinel)

operator-(enumerate_view::iterator,enumerate_view::sentinel)

 

constexpr /*iterator*/& operator++();	(1)	(C++23 起)
constexpr void operator++( int );	(2)	(C++23 起)
constexpr /*iterator*/ operator++( int )     requires ranges::forward_range<Base>;	(3)	(C++23 起)
constexpr /*iterator*/& operator--()     requires ranges::bidirectional_range<Base>;	(4)	(C++23 起)
constexpr /*iterator*/ operator--( int )     requires ranges::bidirectional_range<Base>;	(5)	(C++23 起)
constexpr /*iterator*/& operator+=( difference_type n )     requires ranges::random_access_range<Base>;	(6)	(C++23 起)
constexpr /*iterator*/& operator-=( difference_type n )     requires ranges::random_access_range<Base>;	(7)	(C++23 起)

推进或回退迭代器。

令 current_ 表示底层迭代器并令 pos_ 表示底层索引。

1) 等价于 ++current_; ++pos_; return *this;

2) 等价于 ++current_;

3) 等价于 auto tmp = *this; ++*this; return tmp;

4) 等价于 --current_; --pos_; return *this;

5) 等价于 auto tmp = *this; --*this; return tmp;

6) 等价于 current_ += n; pos_ += n; return *this;

7) 等价于 current_ -= n; pos_ -= n; return *this;

参数

n

-

相对于当前位置的偏移

返回值

1,4,6,7)*this

2) (无)

3,5)*this 被改变之前的副本

参阅

operator+operator- (C++23)

实行迭代器算术运算 (函数)