operator<,<=,>,>=(std::basic_const_iterator<Iter>)

 

C++

编译器支持

自立实现与有宿主实现

语言

标准库

标准库标头

具名要求

功能特性测试宏 (C++20)

语言支持库

概念库 (C++20)

元编程库 (C++11)

诊断库

通用工具库

字符串库

容器库

迭代器库

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)

技术规范

符号索引

外部库

 

迭代器库

迭代器概念
indirectly_readable (C++20) indirectly_writable (C++20) weakly_incrementable (C++20) incrementable (C++20) is-integer-like is-signed-integer-like (C++20)(C++20)	sentinel_for (C++20) sized_sentinel_for (C++20) input_iterator (C++20) output_iterator (C++20) input_or_output_iterator (C++20)	forward_iterator (C++20) bidirectional_iterator (C++20) random_access_iterator (C++20) contiguous_iterator (C++20)
迭代器原语
input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tagcontiguous_iterator_tag (C++20)	iter_value_titer_difference_titer_reference_titer_const_reference_titer_rvalue_reference_titer_common_reference_t (C++20)(C++20)(C++20)(C++23)(C++20)(C++20)	iterator (C++17 中弃用) iterator_traits incrementable_traits (C++20) indirectly_readable_traits (C++20)
算法概念与工具
间接可调用概念
indirectly_unary_invocableindirectly_regular_unary_invocable (C++20)(C++20)	indirect_unary_predicate (C++20) indirect_binary_predicate (C++20)	indirect_equivalence_relation (C++20) indirect_strict_weak_order (C++20)
常用算法要求
indirectly_movable (C++20) indirectly_movable_storable (C++20) indirectly_copyable (C++20)	indirectly_copyable_storable (C++20)   indirectly_swappable (C++20) indirectly_comparable (C++20)	permutable (C++20) mergeable (C++20) sortable (C++20)
工具
indirect_result_t (C++20)	projected (C++20)	projected_value_t (C++26)
迭代器适配器
reverse_iterator make_reverse_iterator (C++14) move_iterator (C++11) make_move_iterator (C++11) default_sentinel_tdefault_sentinel (C++20)(C++20) unreachable_sentinel_tunreachable_sentinel (C++20)(C++20)	front_insert_iterator back_insert_iterator inserter insert_iterator front_inserter back_inserter move_sentinel (C++20)	common_iterator (C++20) counted_iterator (C++20) basic_const_iterator (C++23) const_iterator (C++23) const_sentinel (C++23) make_const_iterator (C++23) make_const_sentinel (C++23)
流迭代器 istream_iterator    ostream_iterator istreambuf_iterator ostreambuf_iterator	迭代器定制点 ranges::iter_move (C++20) ranges::iter_swap (C++20)
迭代器操作 advance distance prev (C++11)   next (C++11) ranges::advance (C++20) ranges::distance (C++20) ranges::prev (C++20) ranges::next (C++20)	范围访问 begincbegin (C++11)(C++14) rbegincrbegin (C++14)(C++14)   endcend (C++11)(C++14) rendcrend (C++14)(C++14)   sizessize (C++17)(C++20) empty (C++17) data (C++17)

 

std::basic_const_iterator

成员函数

basic_const_iterator::basic_const_iterator

basic_const_iterator::base

basic_const_iterator::operator*basic_const_iterator::operator->

basic_const_iterator::operator[]

basic_const_iterator::operator++basic_const_iterator::operator+=basic_const_iterator::operator--basic_const_iterator::operator-=

basic_const_iterator::operator==basic_const_iterator::operator<basic_const_iterator::operator<=basic_const_iterator::operator>basic_const_iterator::operator>=basic_const_iterator::operator<=>

basic_const_iterator::operator constant-iterator

非成员函数

operator<operator<=operator>operator>= (C++23)(C++23)(C++23)(C++23)

operator+ (C++23)

operator- (C++23)

iter_move(std::basic_const_iterator) (C++23)

辅助类

common_type<std::basic_const_iterator> (C++23)

 

template< /*not-a-const-iterator*/ I > friend constexpr bool operator<( const I& x, const basic_const_iterator& y )     requires std::random_access_iterator<Iter> && std::totally_ordered_with<Iter, I>;	(1)	(C++23 起)
template< /*not-a-const-iterator*/ I > friend constexpr bool operator>( const I& x, const basic_const_iterator& y )     requires std::random_access_iterator<Iter> && std::totally_ordered_with<Iter, I>;	(2)	(C++23 起)
template< /*not-a-const-iterator*/ I > friend constexpr bool operator<=( const I& x, const basic_const_iterator& y )     requires std::random_access_iterator<Iter> && std::totally_ordered_with<Iter, I>;	(3)	(C++23 起)
template< /*not-a-const-iterator*/ I > friend constexpr bool operator>=( const I& x, const basic_const_iterator& y )     requires std::random_access_iterator<Iter> && std::totally_ordered_with<Iter, I>;	(4)	(C++23 起)

比较 basic_const_iterator 和另一个值。当左操作数不是 basic_const_iterator 时使用这些函数模板。

当且仅当 I 不是 basic_const_iterator 的特化时，它满足仅用于阐释的概念 /*not-a-const-iterator*/。

这些函数对常规的无限定或有限定查找不可见，而只能在 basic_const_iterator<Iter> 为实参的关联类时由实参依赖查找找到。

参数

x, y

-

要比较的迭代器

返回值

1) x < y.base()

2) x > y.base()

3) x <= y.base()

4) x >= y.base()

注解

如果左操作数为 basic_const_iterator，则使用成员比较函数。

示例

运行此代码

#include <iterator>
 
int main()
{
    static int arr[1];
    static constexpr std::basic_const_iterator<int*> it = std::end(arr);
    static_assert(arr < it);
}