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void swap( vector& other); | (until C++17) | |
void swap( vector& other)noexcept(/* see below */); | (since C++17) (constexpr since C++20) | |
Exchanges the contents and capacity of the container with those ofother. Does not invoke any move, copy, or swap operations on individual elements.
All iterators and references remain valid. Theend() iterator is invalidated.
Ifstd::allocator_traits<allocator_type>::propagate_on_container_swap::value istrue, then the allocators are exchanged using an unqualified call to non-member | (since C++11) |
Contents |
| other | - | container to exchange the contents with |
(none) | (until C++17) |
noexcept specification: noexcept(std::allocator_traits<Allocator>::propagate_on_container_swap::value ||std::allocator_traits<Allocator>::is_always_equal::value) | (since C++17) |
Constant.
#include <iostream>#include <vector> template<class Os,class Co>Os& operator<<(Os& os,const Co& co){ os<<'{';for(constauto& i: co) os<<' '<< i;return os<<" } ";} int main(){std::vector<int> a1{1,2,3}, a2{4,5}; auto it1=std::next(a1.begin());auto it2=std::next(a2.begin()); int& ref1= a1.front();int& ref2= a2.front(); std::cout<< a1<< a2<<*it1<<' '<<*it2<<' '<< ref1<<' '<< ref2<<'\n'; a1.swap(a2);std::cout<< a1<< a2<<*it1<<' '<<*it2<<' '<< ref1<<' '<< ref2<<'\n'; // Note that after swap the iterators and references stay associated with their// original elements, e.g. it1 that pointed to an element in 'a1' with value 2// still points to the same element, though this element was moved into 'a2'.}
Output:
{ 1 2 3 } { 4 5 } 2 5 1 4{ 4 5 } { 1 2 3 } 2 5 1 4The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 341 | C++98 | the capacities ofstd::vector could not be swapped | they are also swapped |
| specializes thestd::swap algorithm (function template)[edit] |
