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std::inplace_vector<T,N>:: swap

From cppreference.net
C++
Containers library
std::inplace_vector
Member types
Member functions
Non-member functions
constexpr void swap ( inplace_vector & other ) noexcept ( /* 见下文 */ ) ;
(自 C++26 起)

交换容器内容与 other 的内容。不会导致迭代器和引用与另一容器关联。

目录

参数

其他 - 用于交换内容的容器

返回值

(无)

异常

noexcept 规范：
noexcept ( N == 0 ||
( std:: is_nothrow_swappable_v < T > && std:: is_nothrow_move_constructible_v < T > ) )

复杂度

与容器大小呈线性关系。

示例

运行此代码 
#include <inplace_vector>
#include <print>
int main()
{
    std::inplace_vector<int, 3> a1{1, 2, 3}, a2{4, 5, 6};
    auto i1 = a1.begin();
    auto i2 = a2.begin();
    int& r1 = a1[1];
    int& r2 = a2[1];
    auto print_them_all = [&](auto rem)
    {
        std::println("{}a1 = {}, a2 = {}, *i1 = {}, *i2 = {}, r1 = {}, r2 = {}",
                     rem, a1, a2, *i1, *i2, r1, r2);
    };
    print_them_all("Before swap:\n");
    a1.swap(a2);
    print_them_all("After swap:\n");
    // 注意交换后迭代器和引用仍与其原始位置保持关联，例如 i1 指向元素 a1[0]，r1 引用 a1[1]。
}

输出： 

Before swap:
a1 = [1, 2, 3], a2 = [4, 5, 6], *i1 = 1, *i2 = 4, r1 = 2, r2 = 5
After swap:
a1 = [4, 5, 6], a2 = [1, 2, 3], *i1 = 4, *i2 = 1, r1 = 5, r2 = 2

参见

(C++26)
特化 std::swap 算法
(函数模板)