operator==、<、>、<=、>=、<=>(ranges::transform_view::iterator)

 

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

特性测试宏 (C++20)

语言支持库

概念库 (C++20)

诊断库

内存管理库

元编程库 (C++11)

通用工具库

容器库

迭代器库

范围库 (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

文件系统库 (C++17)

并发支持库 (C++11)

执行控制库 (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 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::transform_view

成员函数

transform_view::transform_view

transform_view::base

transform_view::begin

transform_view::end

transform_view::size

推导指引

迭代器

transform_view::iterator::iterator

transform_view::iterator::base

transform_view::iterator::operator*

transform_view::iterator::operator[]

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

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

operator+(transform_view::iterator) operator-(transform_view::iterator)

iter_move(transform_view::iterator)

哨位

transform_view::sentinel::sentinel

transform_view::sentinel::base

operator==(transform_view::iterator,transform_view::sentinel)

operator-(transform_view::iterator,transform_view::sentinel)

 

friend constexpr bool operator==( const /*iterator*/& x, const /*iterator*/& y )     requires std::equality_comparable<ranges::iterator_t<Base>>;	(1)	(since C++20)
friend constexpr bool operator<( const /*iterator*/& x, const /*iterator*/& y )     requires ranges::random_access_range<Base>;	(2)	(since C++20)
friend constexpr bool operator>( const /*iterator*/& x, const /*iterator*/& y )     requires ranges::random_access_range<Base>;	(3)	(since C++20)
friend constexpr bool operator<=( const /*iterator*/& x, const /*iterator*/& y )     requires ranges::random_access_range<Base>;	(4)	(since C++20)
friend constexpr bool operator>=( const /*iterator*/& x, const /*iterator*/& y )     requires ranges::random_access_range<Base>;	(5)	(since C++20)
friend constexpr auto operator<=>( const /*iterator*/& x, const /*iterator*/& y )     requires ranges::random_access_range<Base> &&              std::three_way_comparable<ranges::iterator_t<Base>>;	(6)	(since C++20)

比较底层迭代器。

1) 等价于 return x.current_ == y.current_;，其中 current_ 是底层迭代器。

2) 等价于 return x.current_ < y.current_;，其中 current_ 是底层迭代器。

3) 等价于 return y < x;

4) 等价于 return !(y < x);

5) 等价于 return !(x < y);

6) 等价于 return x.current_ <=> y.current_;，其中 current_ 是底层迭代器。

这些函数对于普通的非限定或限定查找是不可见的，并且只有当 std::ranges::transform_view::iterator<Const> 是参数的关联类时，才能通过实参依赖查找找到。

!= 运算符是从 operator== 合成的。

参数

x, y

-

要比较的迭代器

返回值

比较结果

参见

operator== (C++20)

将哨位与从 transform_view::begin 返回的迭代器进行比较 (函数)