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

 

C++

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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 (Ranges library)

范围访问 开始 cbegin   结束 cend rbegin crbegin   rend crend size ssize   data cdata reserve_hint (C++26)   empty

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

悬空迭代器处理 (Dangling iterator handling) dangling borrowed_iterator_t borrowed_subrange_t

范围原语 (Range primitives)
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 concepts)
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 (Range factories)
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 (Range adaptors)
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 (Range generators) std::generator (C++23)

范围适配器闭包对象 (Range adaptor closure objects) range_adaptor_closure (C++23)

范围适配器对象 (Range adaptor objects)

辅助项 (Helper items)
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 (Iterator)

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 (Sentinel)

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)

 

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

自增或自减迭代器。

令 current_ 为底层迭代器数组。

1) 等价于

for (auto& i : current_)
    i = std::ranges::next(i);
return *this;

若在调用前 current_.back() 不可自增，则行为未定义。

2) 等价于

auto tmp = *this;
++*this;
return tmp;

3) 等效于

for (auto& i : current_)
    i = std::ranges::prev(i);
return *this;

若在调用前 current_.front() 不可自减，则行为未定义。

4) 等价于

auto tmp = *this;
--*this;
return tmp;

5) 等同于

for (auto& i : current_)
    i = i + n;
return *this;

若在调用前 current_.back() + n 没有良好定义的行为，则行为未定义。

6) 等价于

for (auto& i : current_)
    i = i - n;
return *this;

若在调用前 current_.front() - n 没有良好定义的行为，则行为未定义。

参数

n

-

相对于当前位置的偏移量

返回值

1,3,5,6) *this

2,4) 改变前 *this 的一个副本。

示例

运行此代码

#include <cassert>
#include <list>
#include <ranges>
#include <utility>
#include <vector>
 
int main()
{
    {
        auto v = std::vector{0, 1, 2, 3, 4, 5};
        auto i = (v | std::views::pairwise).begin();
        assert((*i == std::pair{0, 1}));
        ++i;                            // overload (1)
        assert((*i == std::pair{1, 2}));
        --i;                            // overload (3)
        assert((*i == std::pair{0, 1}));
        i += 2;                         // overload (5)
        assert((*i == std::pair{2, 3}));
        i -= 2;                         // overload (6)
        assert((*i == std::pair{0, 1}));
    }
    {
        auto v = std::list{0, 1, 2, 3, 4, 5};
        auto i = (v | std::views::pairwise).begin();
        assert((*i == std::pair{0, 1}));
        ++i;                            // overload (1)
        assert((*i == std::pair{1, 2}));
        --i;                            // overload (3)
        assert((*i == std::pair{0, 1}));
//      i += 2; // Error: v is not a random_access_range; overload (5)
//      i -= 2; // Error: v is not a random_access_range; overload (6)
    }
}

参阅

operator+operator- (C++23)

进行迭代器算术 (公开成员函数)