std::stack<T,Container>::swap
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)))
In the expression above, the identifier |
(since C++11) (until C++17) |
noexcept specification:
noexcept(std::is_nothrow_swappable_v<Container>)
|
(since C++17) |
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
#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
|
(C++11)
|
specializes the std::swap algorithm (function template) |
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