std::ranges::concat_view<Views...>::end

 

C++

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语言

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标准库头文件

命名要求

特性测试宏 (C++20)

语言支持库

概念库 (C++20)

元编程库 (C++11)

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通用实用程序库

字符串库

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范围库 (C++20)

算法库

数值库

本地化库

输入/输出库

文件系统库 (C++17)

正则表达式库 (C++11)

并发支持库 (C++11)

执行支持库 (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 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 悬空 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    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::concat_view

成员函数

concat_view::concat_view

concat_view::begin

concat_view::end

concat_view::size

推导指南

迭代器

成员函数

concat_view::iterator::iterator

concat_view::iterator::operator*

concat_view::iterator::operator[]

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

concat_view::iterator::satisfy concat_view::iterator::prev concat_view::iterator::advance-fwd concat_view::iterator::advance-bwd

非成员函数

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

operator+(concat_view::iterator) operator-(concat_view::iterator)

iter_move(concat_view::iterator)

iter_swap(concat_view::iterator)

 

constexpr auto end()     requires (!(/*simple-view*/<Views> && ...));	(1)	(自 C++26 起)
constexpr auto end() const     requires (ranges::range<const Views> && ...) &&                  /*concatable*/<const Views...>;	(2)	(自 C++26 起)

返回一个 迭代器 或 std::default_sentinel，它与 concat_view 的末尾迭代器比较相等。

1) 等效于

constexpr auto N = sizeof...(Views);
if constexpr (ranges::common_range<Views...[N - 1]>)
    return iterator <false>(this, std::in_place_index<N - 1>,
                           ranges::end(std::get<N - 1>(views_ )));
else
    return std::default_sentinel;

.

2) 等效于

constexpr auto N = sizeof...(Views);
if constexpr (ranges::common_range<const Views...[N - 1]>)
    return iterator <true>(this, std::in_place_index<N - 1>,
                           ranges::end(std::get<N - 1>(views_ )));
else
    return std::default_sentinel;

.

返回值

如上所述。

示例

可以在 Compiler Explorer 上查看初步版本。

运行此代码

#include <concepts>
#include <iterator>
#include <ranges>
 
int main()
{
    static constexpr int p[]{37, 42, 69};
    static constexpr auto q = {19937, 1729};
    constexpr auto cat = std::ranges::views::concat(p, q);
    static_assert(not std::same_as<std::default_sentinel_t, decltype(cat.end())>);
    static_assert(cat.end()[-1] == 1729);
}

另请参见

begin	返回指向范围开头的迭代器 (公有成员函数)
ranges::end (C++20)	返回一个表示范围结束的哨兵 (定制点对象)