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std::stack::swap(3) | C++ Standard Libary | std::stack::swap(3) |
NAME¶
std::stack::swap - std::stack::swap
Synopsis¶
void swap( stack& other ) noexcept(/* see below */); (since C++11)
Exchanges the contents of the container adaptor with those of other.
Effectively
calls using std::swap; swap(c, other.c);
Parameters¶
other - container adaptor to exchange the contents with
Return value¶
(none)
Exceptions¶
noexcept specification:
noexcept(noexcept(swap(c, other.c))) (since C++11)
(until C++17)
In the expression above, the identifier swap is looked up in the same
manner as the one used by the C++17 std::is_nothrow_swappable trait.
noexcept specification: (since C++17)
noexcept(std::is_nothrow_swappable_v<Container>)
Complexity¶
Same as underlying container (typically constant).
Notes¶
Some implementations (e.g. libc++) provide the swap member
function as an extension
to pre-C++11 modes.
Example¶
// Run this code
#include <iostream>
#include <stack>
#include <string>
#include <vector>
template <typename Stack>
void print(Stack stack /* pass by value */, int id)
{
std::cout << "s" << id << " [" <<
stack.size() << "]: ";
for (; !stack.empty(); stack.pop())
std::cout << stack.top() << ' ';
std::cout << (id > 1 ? "\n\n" : "\n");
}
int main()
{
std::vector<std::string>
v1{"1","2","3","4"},
v2{"Ɐ","B","Ɔ","D","Ǝ"};
std::stack s1{std::move(v1)};
std::stack s2{std::move(v2)};
print(s1, 1);
print(s2, 2);
s1.swap(s2);
print(s1, 1);
print(s2, 2);
}
Output:¶
s1 [4]: 4 3 2 1
s2 [5]: Ǝ D Ɔ B Ɐ
s1 [5]: Ǝ D Ɔ B Ɐ
s2 [4]: 4 3 2 1
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
See also¶
std::swap(std::stack) specializes the std::swap algorithm
(C++11) (function template)
2022.07.31 | http://cppreference.com |