std::iter_move(std::reverse_iterator)

 

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std::reverse_iterator

成員函式

reverse_iterator::reverse_iterator

reverse_iterator::operator=

reverse_iterator::base

reverse_iterator::operator*reverse_iterator::operator->

reverse_iterator::operator[]

reverse_iterator::operator++reverse_iterator::operator+reverse_iterator::operator+=reverse_iterator::operator--reverse_iterator::operator-reverse_iterator::operator-=

非成員函式

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

operator+

operator-

iter_move (C++20)

iter_swap (C++20)

make_reverse_iterator (C++14)

 

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

將解引用已調整的底層迭代器的結果轉換為其相關的右值引用型別。

等價於 auto tmp = i.base();
return std::ranges::iter_move(--tmp);。

此函式模板對普通的非限定查詢或限定查詢不可見，只能透過實參依賴查詢找到，當 std::reverse_iterator<Iter> 是實參的關聯類時。

引數

i

-

源反向迭代器

返回值

一個右值引用或一個純右值臨時量。

複雜度

常數時間。

異常

noexcept 規範：  

noexcept(

    std::is_nothrow_copy_constructible_v<Iter> &&
    noexcept(std::ranges::iter_move(--std::declval<Iter&>()))

)

示例

執行此程式碼

#include <iomanip>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>
 
void print(const auto& rem, const auto& v)
{
    std::cout << rem << '[' << size(v) << "] {";
    for (char comma[]{0, 0}; const auto& s : v)
        std::cout << comma << ' ' << std::quoted(s), comma[0] = ',';
    std::cout << " }\n";
}
 
int main()
{
    std::vector<std::string> p{"Alpha", "Bravo", "Charlie"}, q;
 
    print("p", p), print("q", q);
 
    using RI = std::reverse_iterator<std::vector<std::string>::iterator>;
 
    for (RI iter{p.rbegin()}, rend{p.rend()}; iter != rend; ++iter)
        q.emplace_back(/* ADL */ iter_move(iter));
 
    print("p", p), print("q", q);
}

可能的輸出

p[3] { "Alpha", "Bravo", "Charlie" }
q[0] { }
p[3] { "", "", "" }
q[3] { "Charlie", "Bravo", "Alpha" }

參閱

iter_move (C++20)	將解引用物件的結果轉換為其關聯的右值引用型別 (定製點物件)
iter_move (C++20)	將底層迭代器解引用的結果轉換為其關聯的右值引用型別 (函式)
move (C++11)	將引數轉換為亡值 (函式模板)
move_if_noexcept (C++11)	如果移動建構函式不丟擲異常，則將引數轉換為亡值 (函式模板)
forward (C++11)	轉發函式引數並使用型別模板引數來保留其值類別 (函式模板)
ranges::move (C++20)	將一個範圍的元素移動到一個新位置 (演算法函式物件)
ranges::move_backward (C++20)	以逆序將一個範圍的元素移動到一個新位置 (演算法函式物件)