std::move_iterator<Iter>::operator[]

 

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)

诊断库

内存管理库

元编程库(C++11)

通用工具库

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迭代器库

范围库(C++20)

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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 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::move_iterator

成员函数

move_iterator::move_iterator

move_iterator::operator=

move_iterator::base

move_iterator::operator*move_iterator::operator->

move_iterator::operator[]

move_iterator::operator++move_iterator::operator+move_iterator::operator+=move_iterator::operator--move_iterator::operator-move_iterator::operator-=

非成员函数

operator==operator!=operator<operator<=operator>operator>=operator<=> (C++20 前)(C++20)

operator==(move_sentinel) (C++20)

operator+

operator-

operator-(move_sentinel) (C++20)

iter_move (C++20)

iter_swap (C++20)

make_move_iterator (C++11)

 

/* 未指定 */ operator[]( difference_type n )const;		(C++17 起为 constexpr) (C++20 前)
constexpr reference operator[]( difference_type n )const;		(C++20 起)

返回到位于指定相对位置的元素的引用。

参数

n

-

相对于当前位置的位置

返回值

std::move(current [n])(C++20 前)ranges::iter_move(current + n)(C++20 起)

注解

不指定返回类型的原因是底层迭代器的 operator[] 也没有指定返回类型（见老式随机访问迭代器(LegacyRandomAccessIterator) ）。

(C++20 前)

示例

运行此代码

#include <cstddef>#include <iomanip>#include <iostream>#include <iterator>#include <list>#include <string>#include <vector>   void print(auto rem, constauto& v){for(std::cout<< rem;constauto& e : v)std::cout<<std::quoted(e)<<' ';std::cout<<'\n';}   int main(){std::vector<std::string> p{"alpha", "beta", "gamma", "delta"}, q; print("1) p: ", p);   std::move_iterator it{p.begin()};   for(std::size_t t{}; t != p.size();++t) q.emplace_back(it[t]);   print("2) p: ", p); print("3) q: ", q);   std::list l{1, 2, 3};std::move_iterator it2{l.begin()};// it2[1] = 13; // 编译错误：底层迭代器未实现随机访问迭代器// *it2 = 999; // 编译错误：以右值为左值}

可能的输出：

1) p: "alpha" "beta" "gamma" "delta" 2) p: "" "" "" "" 3) q: "alpha" "beta" "gamma" "delta"

参阅

operator*operator->

访问被指向的元素 (公开成员函数)