std::ranges::chunk_view<V>::outer-iterator

 

C++

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功能特性测试宏 (C++20)

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概念库 (C++20)

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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    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 (C++23 前)  (C++23)	simple-view non-propagating-cache

 

std::ranges::chunk_view

成员函数
chunk_view::chunk_view
chunk_view::base
chunk_view::begin
chunk_view::end
chunk_view::size
input_range 类 推导指引 outer-iterator chunk_view::outer-iterator::outer-iterator chunk_view::outer-iterator::operator= chunk_view::outer-iterator::operator* chunk_view::outer-iterator::operator++ chunk_view::outer-iterator::operator++(int) operator==(chunk_view::outer-iterator) operator-(chunk_view::outer-iterator) outer-iterator::value_type chunk_view::outer-iterator::value_type::value_type   chunk_view::outer-iterator::value_type::begin chunk_view::outer-iterator::value_type::end chunk_view::outer-iterator::value_type::size inner-iterator chunk_view::inner-iterator::inner-iterator chunk_view::inner-iterator::operator= chunk_view::inner-iterator::base chunk_view::inner-iterator::operator* chunk_view::inner-iterator::operator++ chunk_view::inner-iterator::operator++(int) operator==(chunk_view::inner-iterator) operator-(chunk_view::inner-iterator) iter_move(chunk_view::inner-iterator) iter_swap(chunk_view::inner-iterator)	forward_range 类模板 iterator chunk_view::iterator::iterator chunk_view::iterator::base chunk_view::iterator::operator* chunk_view::iterator::operator[] chunk_view::iterator::operator++ chunk_view::iterator::operator++(int) chunk_view::iterator::operator-- chunk_view::iterator::operator--(int) chunk_view::iterator::operator+= chunk_view::iterator::operator-= operator==(chunk_view::iterator) operator<(chunk_view::iterator) operator>(chunk_view::iterator) operator<=(chunk_view::iterator) operator>=(chunk_view::iterator) operator<=>(chunk_view::iterator) operator+(chunk_view::iterator) operator-(chunk_view::iterator)

 

class /*outer-iterator*/		(C++23 起) (仅用于阐述*)

如果 V 实现 input_range，则为 chunk_view::begin 的返回类型。

成员类型

成员类型	定义
iterator_concept	std::input_iterator_tag
difference_type	ranges::range_difference_t<V>

数据成员

成员对象	定义
parent_ (私有)	指向类型为 ranges::chunk_view* 的“父对象”的指针 (仅用于阐述的成员对象*)

成员函数

(构造函数) (C++23)	构造迭代器 (公开成员函数)
operator= (C++23)	移动赋值另一迭代器 (公开成员函数)
operator* (C++23)	访问元素 (公开成员函数)
operator++ (C++23)	增加迭代器 (公开成员函数)

非成员函数

operator== (C++23)	比较迭代器与 default sentinel (函数)
operator- (C++23)	计算剩余区块数量 (函数)

嵌套类

value_type (C++23)

/*output-iterator*/ 的值类型 (公开成员类)

示例

运行此代码

#include <iostream>
#include <iterator>
#include <ranges>
#include <sstream>
 
int main()
{
    const std::string source{"ABCDEFGHIJ"};
 
    auto letters = std::istringstream{source};
    auto chunks = std::ranges::istream_view<char>(letters)
                | std::views::chunk(4);
 
    for (auto outer_iter = chunks.begin(); outer_iter != std::default_sentinel;
         ++outer_iter)
    {
        auto chunk = *outer_iter; // chunk 是 chunk_view::outer_iterator::value_type 类型的对象
        std::cout << '[';
        for (auto inner_iter = chunk.begin(); inner_iter != std::default_sentinel;
             ++inner_iter)
            std::cout << *inner_iter;
        std::cout << "] ";
    }
    std::cout << '\n';
 
    // 使用范围 for 循环的相同输出
    auto letters2 = std::istringstream{source};
    auto chunks2 = std::ranges::istream_view<char>(letters2)
                 | std::views::chunk(4);
    for (auto chunk : chunks2)
    {
        std::cout << '[';
        for (auto ch : chunk)
            std::cout << ch;
        std::cout << "] ";
    }
    std::cout << '\n';
}

输出：

[ABCD] [EFGH] [IJ]
[ABCD] [EFGH] [IJ]

引用

• C++23 标准（ISO/IEC 14882:2024）：

• 26.7.28.3 Class chunk_view::outer-iterator [range.chunk.outer.iter]