20 General utilities library [utilities]

20.5 Tuples [tuple]

20.5.3 Class template tuple [tuple.tuple]

20.5.3.3 swap [tuple.swap]

constexpr void swap(tuple& rhs) noexcept(see below);
Preconditions: Each element in *this is swappable with ([swappable.requirements]) the corresponding element in rhs.
Effects: Calls swap for each element in *this and its corresponding element in rhs.
Throws: Nothing unless one of the element-wise swap calls throws an exception.
Remarks: The exception specification is equivalent to the logical AND of the following expressions: is_nothrow_swappable_v<> where is the type in Types.