Defined in header <tuple> | ||
|---|---|---|
| (1) | ||
template< class... Types >
void swap( std::tuple<Types...>& lhs,
std::tuple<Types...>& rhs ) noexcept(/* see below */);
| (since C++11) (until C++20) | |
template< class... Types >
constexpr void swap( std::tuple<Types...>& lhs,
std::tuple<Types...>& rhs ) noexcept(/* see below */);
| (since C++20) | |
template< class... Types >
constexpr void swap( const std::tuple<Types...>& lhs,
const std::tuple<Types...>& rhs ) noexcept(/* see below */);
| (2) | (since C++23) |
Swaps the contents of lhs and rhs. Equivalent to lhs.swap(rhs).
1) This overload participates in overload resolution only if std::is_swappable_v<Ti> is true for all i from 0 to sizeof...(Types). 2) This overload participates in overload resolution only if std::is_swappable_v<const Ti> is true for all i from 0 to sizeof...(Types). | (since C++17) |
| lhs, rhs | - | tuples whose contents to swap |
(none).
noexcept specification: noexcept(noexcept(lhs.swap(rhs)))#include <iostream>
#include <string>
#include <tuple>
int main()
{
std::tuple<int, std::string, float>
p1{42, "ABCD", 2.71},
p2;
p2 = std::make_tuple(10, "1234", 3.14);
auto print_p1_p2 = [&](auto rem) {
std::cout << rem
<< "p1 = {" << std::get<0>(p1)
<< ", " << std::get<1>(p1)
<< ", " << std::get<2>(p1) << "}, "
<< "p2 = {" << std::get<0>(p2)
<< ", " << std::get<1>(p2)
<< ", " << std::get<2>(p2) << "}\n";
};
print_p1_p2("Before p1.swap(p2): ");
p1.swap(p2);
print_p1_p2("After p1.swap(p2): ");
swap(p1, p2);
print_p1_p2("After swap(p1, p2): ");
}Output:
Before p1.swap(p2): p1 = {42, ABCD, 2.71}, p2 = {10, 1234, 3.14}
After p1.swap(p2): p1 = {10, 1234, 3.14}, p2 = {42, ABCD, 2.71}
After swap(p1, p2): p1 = {42, ABCD, 2.71}, p2 = {10, 1234, 3.14}|
(C++11) | swaps the contents of two tuples (public member function) |
|
(C++11) | specializes the std::swap algorithm (function template) |
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