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

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C++
Containers library
std::inplace_vector
Member types
Member functions
Non-member functions
constexpr void swap ( inplace_vector & other ) noexcept ( /* see below */ ) ;
(since C++26)

Exchanges the contents of the container with those of other . Does not cause iterators and references to associate with the other container.

Parameters

other - container to exchange the contents with

Return value

(none)

Exceptions

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

Complexity

Linear in size of the container.

Example

Run this code 
#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");
 
    // Note that after swap() iterators and references stay associated with their
    // original sites, e.g., i1 points to element a1[0], r1 refers to a1[1].
}

Output: 

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

See also

(C++26)
specializes the std::swap algorithm
(function template)
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