std::ranges::lazy_split_view<V,Pattern>::begin

 

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功能测试宏 (C++20)

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元编程库 (C++11)

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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

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

 

std::ranges::lazy_split_view

成员函数

lazy_split_view::lazy_split_view

lazy_split_view::base

lazy_split_view::begin

lazy_split_view::end

嵌套类

lazy_split_view::outer_iterator

lazy_split_view::outer_iterator::value_type

lazy_split_view::inner_iterator

推导指南

 

constexpr auto begin();	(1)	(自 C++20 起)
constexpr auto begin() const   requires ranges::forward_range<V> && ranges::forward_range<const V>;	(2)	(自 C++20 起)

返回一个指向 lazy_split_view 的第一个元素的 outer_iterator。

令 base_ 为底层视图。

1) 等价于

constexpr auto begin() {
  if constexpr (ranges::forward_range<V>)
    return /*outer_iterator*/</*simple_view*/<V>>{*this, ranges::begin(base_)};
  else {
    current_ = ranges::begin(base_);
    return /*outer_iterator*/<false>{*this};
  }
}

2) 等价于 return /*outer_iterator*/<true>{*this, ranges::begin(base_)};.

参数

(无)

返回值

指向第一个元素的 outer_iterator。

另请参阅

end	返回指向末尾的迭代器或哨兵 (公共成员函数)
ranges::begin (C++20)	返回指向范围开头的迭代器 (定制点对象)