std::indirect<T, Allocator>::swap

std::indirect<T, Allocator>::swap - cppreference.com

From cppreference.com

`constexpr void swap( indirect& other ) noexcept(/* see below */);`		(since C++26)

Swaps the contents with those of other.

In the description below, swap_allocators refers to std::allocator_traits<Allocator>::propagate_on_container_swap::value.

Swaps the states of *this and other, exchanging owned objects or valueless states.

If swap_allocators is true, then executes using std::swap;
swap(alloc , other.alloc );.
Otherwise, the allocators are not swapped.

If one of the following conditions is satisfied, the behavior is undefined:

swap_allocators is true, and Allocator does not satisfy the requirements of Swappable.
swap_allocators is false, and get_allocator() == other.get_allocator() is false.

other - the indirect object to exchange the contents with

specification:

noexcept(std::allocator_traits<Allocator>::propagate_on_container_swap::value || std::allocator_traits<Allocator>::is_always_equal::value)