std::iter_swap(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)

 

template< std::indirectly_swappable<Iter> Iter2 > friend constexpr void iter_swap( const reverse_iterator& x,                                  const std::reverse_iterator<Iter2>& y )     noexcept(/* 見下 */);		(C++20 起)

交換兩個經調整的底層迭代器所指向的物件。

等價於 auto tmp_x = x.base();
auto tmp_y = y.base();
ranges::iter_swap(--tmp_x, --tmp_y);。

此函式模板對通常的非限定或限定查詢不可見，而只能在 std::reverse_iterator<Iter> 是引數的關聯類時由實參依賴查詢找到。

引數

x, y

-

指向要交換的元素的反向迭代器

複雜度

常數時間。

異常

noexcept 規範：  

noexcept(

    std::is_nothrow_copy_constructible_v<Iter> &&
    std::is_nothrow_copy_constructible_v<Iter2> &&
    noexcept(ranges::iter_swap(--std::declval<Iter&>(), --std::declval<Iter2&>()))

)

示例

執行此程式碼

#include <iostream>
#include <iterator>
#include <list>
#include <vector>
 
int main()
{
    std::vector v{1, 2, 3};
    std::list l{4, 5, 6};
 
    std::reverse_iterator<std::vector<int>::iterator> r1{v.rbegin()};
    std::reverse_iterator<std::list<int>::iterator> r2{l.rbegin()};
 
    std::cout << *r1 << ' ' << *r2 << '\n';
 
    iter_swap(r1, r2); // ADL
 
    std::cout << *r1 << ' ' << *r2 << '\n';
}

輸出

3 6
6 3

參閱

swap	交換兩個物件的值 (函式模板)
swap_ranges	交換兩個範圍的元素 (函式模板)
iter_swap	交換兩個迭代器所指向的元素 (函式模板)
iter_swap (C++20)	交換兩個可解引用物件所引用的值 (自定義點物件)
iter_swap (C++20)	交換兩個底層迭代器指向的物件 (函式模板)