std::ranges::adjacent_view<V,N>::iterator

 

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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 empty

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

悬空迭代器处理 dangling borrowed_iterator_t borrowed_subrange_t

范围基元
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    sized_range	common_range view viewable_range	input_range output_range forward_range	bidirectional_range    random_access_range contiguous_range	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 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 concat_viewviews::concat (C++26)(C++26)	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)

范围适配器闭包对象 range_adaptor_closure (C++23)

范围适配器对象

辅助项
copyable-box movable-box (直到 C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::adjacent_view

成员函数

adjacent_view::adjacent_view

adjacent_view::begin

adjacent_view::end

adjacent_view::size

迭代器

成员函数

adjacent_view::iterator::iterator

adjacent_view::iterator::operator*

adjacent_view::iterator::operator[]

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

非成员函数

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

operator+(adjacent_view::iterator) operator-(adjacent_view::iterator)

iter_move(adjacent_view::iterator)

iter_swap(adjacent_view::iterator)

哨兵

成员函数

adjacent_view::sentinel::sentinel

非成员函数

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

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

 

template< bool Const > class /*iterator*/		(自 C++23 起) (仅供展示*)

adjacent_view::begin 的返回值类型，以及当底层视图 V 为 common_range 时 adjacent_view::end 的返回值类型。

类型 /*iterator*/<true> 由 const 限定的重载返回。类型 /*iterator*/<false> 由非 const 限定的重载返回。

成员类型

成员类型	定义
Base (私有)	const V 如果 Const 为 true，否则为 V. (仅供展示成员类型*)
iterator_category	std::input_iterator_tag
iterator_concept	std::random_access_iterator_tag，如果 Base 符合 random_access_range。否则， std::bidirectional_iterator_tag，如果 Base 符合 bidirectional_range。否则， std::forward_iterator_tag.
value_type	std::tuple</*REPEAT*/(ranges::range_value_t<Base>, N)...>;
difference_type	ranges::range_difference_t<Base>

数据成员

成员对象	定义
current_ (私有)	std::array<ranges::iterator_t<Base>, N>. (仅供展示成员对象*)

成员函数

(构造函数)	构造一个迭代器 (公共成员函数)
operator*	访问元素 (公共成员函数)
operator[]	通过索引访问元素 (公共成员函数)
operator++operator++(int)operator--operator--(int)operator+=operator-=	前进或后退底层迭代器 (公共成员函数)

非成员函数

operator==operator<operator>operator<=operator>=operator<=> (C++23)	比较底层迭代器 (函数)
operator+operator- (C++23)	执行迭代器算术运算 (函数)
iter_move (C++23)	将对底层迭代器的解引用结果强制转换为其关联的右值引用类型 (函数)
iter_swap (C++23)	交换两个底层迭代器指向的对象 (函数)

示例

运行此代码

#include <cassert>
#include <concepts>
#include <list>
#include <ranges>
#include <tuple>
#include <utility>
#include <vector>
 
int main()
{
    auto v = std::vector{0, 1, 2, 3, 4, 5};
    auto i = (v | std::views::adjacent<3>).begin();
    using I = decltype(i);
    static_assert(std::same_as<I::value_type, std::tuple<int, int, int>>);
    static_assert(std::same_as<I::iterator_concept, std::random_access_iterator_tag>);
    // some of available operators:
    ++i; i++; --i; i--; i += 2; i -= 2;
    assert(i[2] == std::tuple(2, 3, 4));
    using DI = decltype(*i);
    static_assert(std::same_as<DI, std::tuple<int&, int&, int&>>);
    std::get<1>(*i) = 42; // modifies v[1] via iterator i
    assert(v[1] == 42);
 
    auto l = std::list{0, 1, 2, 3, 4, 5};
    auto j = (l | std::views::adjacent<3>).begin();
    using J = decltype(j);
    static_assert(std::same_as<J::value_type, std::tuple<int, int, int>>);
    static_assert(std::same_as<J::iterator_concept, std::bidirectional_iterator_tag>);
    ++j; --j; j++; j--; // some of available operators
    // j += 2; j -= 2;       // error: these operator are not available
    // std::ignore() = j[1]; //        for bidirectional iterator
}

参考文献

• C++23 标准 (ISO/IEC 14882:2024)

• 26.7.25.3 类模板 adjacent_view::iterator [range.adjacent.iterator]