std::swap(std::tuple)
From cppreference.com
Defined in header <tuple>
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| (1) | ||
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template
<
class... Types
>
void swap(
std::tuple
<Types...>
& lhs, |
(since C++11) (until C++20) |
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template
<
class... Types
>
constexpr
void swap(
std::tuple
<Types...>
& lhs, |
(since C++20) | |
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template
<
class... Types
>
constexpr
void swap(
const
std::tuple
<Types...>
& lhs, |
(2) | (since C++23) |
Swaps the contents of lhs and rhs. Equivalent to lhs.swap(rhs)
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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)
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(since C++17) |
Parameters
| lhs, rhs | - | tuples whose contents to swap |
Return value
(none)
Exceptions
noexcept specification:
noexcept
(
noexcept
(lhs.swap
(rhs)
)
)
Example
Run this code
#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}
See also
swaps the contents of two tuples (public member function) |
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(C++11)
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specializes the std::swap algorithm (function template) |