std::tuple<Types...>::swap
Defined in header <tuple>
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||
void swap( tuple& other ) noexcept(/* see below */); |
(since C++11) (until C++20) |
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constexpr void swap( tuple& other ) noexcept(/* see below */); |
(since C++20) | |
Calls swap
(which might be std::swap, or might be found via ADL) for each element in *this and its corresponding element in other
.
Parameters
other | - | tuple of values to swap |
Return value
(none)
Exceptions
noexcept specification:
noexcept( noexcept(swap(std::declval<T0&>>(), std::declval<T0&>())) && In the expression above, the identifier |
(until C++17) |
noexcept specification:
noexcept( std::is_nothrow_swappable_v<T0> && |
(since C++17) |
Example
Run this code
#include <iostream> #include <tuple> #include <string> int main() { std::tuple<int, std::string, float> p1, p2; p1 = std::make_tuple(10, "test", 3.14); p2.swap(p1); std::cout << "(" << std::get<0>(p2) << ", " << std::get<1>(p2) << ", " << std::get<2>(p2) << ")\n"; }
Output:
(10, test, 3.14)
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
LWG 2456 | C++11 | the noexcept specification is ill-formed
|
made to work |