std::ranges::subrange<I,S,K>::next

 

C++

编译器支持

独立式和宿主式

语言

标准库

标准库头文件

具名要求

Feature test macros (C++20)

语言支持库

Concepts library (C++20)

诊断库

内存管理库

Metaprogramming library (C++11)

通用工具库

容器库

迭代器库

Ranges library (C++20)

算法库

字符串库

文本处理库

数值库

日期和时间库

输入/输出库

Filesystem library (C++17)

Concurrency support library (C++11)

Execution control library (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 (until C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::subrange

成员函数

subrange::subrange

subrange::operator PairLike

观察器

subrange::begin

subrange::end

subrange::empty

subrange::size

迭代器操作

subrange::advance

subrange::next

subrange::prev

推导指引

非成员函数

get(std::ranges::subrange)

辅助类型

subrange_kind

tuple_size<std::ranges::subrange>

tuple_element<std::ranges::subrange>

 

constexpr subrange next( std::iter_difference_t<I> n = 1 ) const&     requires std::forward_iterator<I>;	(1)	(since C++20)
constexpr subrange next( std::iter_difference_t<I> n = 1 ) &&;	(2)	(since C++20)

返回一个 subrange，其 begin_ 被递增（如果 n 为负数则递减）。实际的递增（或递减）操作由 advance() 执行。

1) 返回 *this 的副本。

等价于： auto tmp = *this;
tmp.advance(n);
return tmp;。

2) 返回从 *this 移动的 subrange。

等价于： advance(n);
return std::move(*this);。

参数

n

-

迭代器的最大递增次数

返回值

如上所述。

注释

此函数与 advance() 的区别在于后者执行就地递增（或递减）。

示例

运行此代码

#include <array>
#include <iterator>
#include <print>
#include <ranges>
 
int main()
{
    std::array arr{1, 2, 3, 4, 5, 6, 7};
    std::ranges::subrange sub{std::next(arr.begin(), 2), std::prev(arr.end(), 2)};
    std::println("1) sub: {}", sub);
    std::println("2) sub: {}", sub.next());
    std::println("3) sub: {}", sub.next(2));
}

输出

1) sub: [3, 4, 5]
2) sub: [4, 5]
3) sub: [5]

参见

prev	获取 subrange 的副本，其迭代器按给定距离递减 (public member function)
advance	按给定距离递增迭代器 (public member function)
next (C++11)	递增迭代器 (function template)
ranges::next (C++20)	按给定距离或到边界递增迭代器 (algorithm function object)