iter_move(std::move_iterator)

 

C++

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功能特性测试宏 (C++20)

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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)
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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)
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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)
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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)

 

friend constexpr std::iter_rvalue_reference_t<Iter>     iter_move( const std::move_iterator& i ) noexcept(/* 见下文 */);		(C++20 起)

将解引用底层迭代器的结果转型到其关联的右值引用类型。

函数体等价于：return std::ranges::iter_move(i.base());。

此函数模板对常规的无限定或有限定查找不可见，而只能在 std::move_iterator<Iter> 为实参的关联类时由实参依赖查找找到。

参数

i

-

源移动迭代器

返回值

右值引用或纯右值临时量。

复杂度

常数。

异常

noexcept 说明：  

noexcept(noexcept(ranges::iter_move(i.base())))

示例

运行此代码

#include <iomanip>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>
 
void print(auto const& rem, auto const& v)
{
    std::cout << rem << '[' << size(v) << "] { ";
    for (char comma[]{0, ' ', 0}; auto const& s : v)
        std::cout << comma << std::quoted(s), comma[0] = ',';
    std::cout << " }\n";
}
 
int main()
{
    std::vector<std::string> p{"Andromeda", "Cassiopeia", "Phoenix"}, q;
 
    print("p", p), print("q", q);
 
    using MI = std::move_iterator<std::vector<std::string>::iterator>;
 
    for (MI first{p.begin()}, last{p.end()}; first != last; ++first)
        q.emplace_back(/* ADL */ iter_move(first));
 
    print("p", p), print("q", q);
}

可能的输出：

p[3] { "Andromeda", "Cassiopeia", "Phoenix" }
q[0] {  }
p[3] { "", "", "" }
q[3] { "Andromeda", "Cassiopeia", "Phoenix" }

参阅

iter_move (C++20)	将解引用迭代器的结果转换为其关联的右值引用类型 (定制点对象)
iter_move (C++20)	将解引用调整后的底层迭代器的结果转换为其关联的右值引用类型 (函数)
move (C++11)	获得右值引用 (函数模板)
move_if_noexcept (C++11)	若移动构造函数不抛出则获得右值引用 (函数模板)
forward (C++11)	转发一个函数实参 (函数模板)
ranges::move (C++20)	将某一范围的元素移动到一个新的位置 (niebloid)
ranges::move_backword (C++20)	按从后往前的顺序移动某一范围的元素到新的位置 (niebloid)