table of contents
std::swap(std::priority_queue)(3) | C++ Standard Libary | std::swap(std::priority_queue)(3) |
NAME¶
std::swap(std::priority_queue) - std::swap(std::priority_queue)
Synopsis¶
Defined in header <queue>
template< class T, class Container, class Compare >
(since C++11)
void swap( std::priority_queue<T,Container,Compare>& lhs, (until
C++17)
std::priority_queue<T,Container,Compare>& rhs );
template< class T, class Container, class Compare >
void swap( std::priority_queue<T,Container,Compare>& lhs, (since
C++17)
std::priority_queue<T,Container,Compare>& rhs ) noexcept(/* see
below
*/);
Specializes the std::swap algorithm for std::priority_queue. Swaps the
contents of
lhs and rhs. Calls lhs.swap(rhs).
This overload participates in overload resolution only if
std::is_swappable_v<Container> and std::is_swappable_v<Compare>
are (since C++17)
both true.
Parameters¶
lhs, rhs - containers whose contents to swap
Return value¶
(none)
Complexity¶
Same as swapping the underlying container.
Exceptions¶
noexcept specification: (since C++17)
noexcept(noexcept(lhs.swap(rhs)))
Notes¶
Although the overloads of std::swap for container adaptors are
introduced in C++11,
container adaptors can already be swapped by std::swap in C++98. Such calls
to
std::swap usually have linear time complexity, but better complexity may be
provided.
Example¶
// Run this code
#include <algorithm>
#include <iostream>
#include <queue>
int main()
{
std::priority_queue<int> alice;
std::priority_queue<int> bob;
auto print = [](const auto & title, const auto &cont) {
std::cout << title << " size=" << cont.size();
std::cout << " top=" << cont.top() << '\n';
};
for (int i = 1; i < 4; ++i)
alice.push(i);
for (int i = 7; i < 11; ++i)
bob.push(i);
// Print state before swap
print("alice:", alice);
print("bob :", bob);
std::cout << "-- SWAP\n";
std::swap(alice, bob);
// Print state after swap
print("alice:", alice);
print("bob :", bob);
}
Output:¶
alice: size=3 top=3
bob : size=4 top=10
-- SWAP
alice: size=4 top=10
bob : size=3 top=3
See also¶
swap swaps the contents
(C++11) (public member function)
2022.07.31 | http://cppreference.com |