std:: swap (std::tuple)
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Defined in header
<tuple>
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||
| (1) | ||
|
template
<
class
...
Types
>
void
swap
(
std::
tuple
<
Types...
>
&
lhs,
|
(since C++11)
(until C++20) |
|
|
template
<
class
...
Types
>
constexpr
void
swap
(
std::
tuple
<
Types...
>
&
lhs,
|
(since C++20) | |
|
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 ) .
|
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) |
Parameters
| lhs, rhs | - | tuples whose contents to swap |
Return value
(none)
Exceptions
Example
#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
tuple
s
(public member function) |
|
|
(C++11)
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specializes the
std::swap
algorithm
(function template) |